Ormat (ORA) 10-K 2 Mar 20 2019 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2019	Feb. 26, 2020	Jun. 30, 2019
Document Information [Line Items]
Entity Central Index Key	0001296445
Entity Registrant Name	ORMAT TECHNOLOGIES, INC.
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2019
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2019
Document Transition Report	false
Entity File Number	001-32347
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	88-0326081
Entity Address, Address Line One	6140 Plumas Street
Entity Address, City or Town	Reno
Entity Address, State or Province	NV
Entity Address, Postal Zip Code	89519-6075
City Area Code	775
Local Phone Number	356-9029
Title of 12(b) Security	Common Stock $0.001 Par Value
Trading Symbol	ORA
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 2,527,613,074
Entity Common Stock, Shares Outstanding		51,031,652

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands		Dec. 31, 2019		Dec. 31, 2018
Current assets:
Cash and cash equivalents		$ 71,173		$ 98,802
Restricted cash and cash equivalents (primarily related to VIEs)		81,937		78,693
Receivables:
Trade (primarily related to VIEs)		154,525		137,581
Other		22,048		19,393
Inventories		34,949		45,024
Costs and estimated earnings in excess of billings on uncompleted contracts	[1]	38,365		42,130
Prepaid expenses and other		12,667		51,441
Total current assets		415,664		473,064
Investment in unconsolidated companies		81,140		71,983
Deposits and other		38,284		18,209
Deferred income taxes		129,510		113,760
Property, plant and equipment, net		1,971,415		1,959,578
Construction-in-process		376,555		261,690
Operating leases right of use		17,405		0
Finance leases right of use		14,161		0
Deferred financing and lease costs, net		0		3,242
Intangible assets, net		186,220		199,874
Goodwill		20,140		19,950
Total assets	[2]	3,250,494	[3]	3,121,350	[4]
Current liabilities:
Accounts payable and accrued expenses		141,857		116,362
Short term revolving credit lines with banks (full recourse)		40,550		159,000
Commercial paper		50,000		0
Billings in excess of costs and estimated earnings on uncompleted contracts		2,755		18,402
Current portion of long-term debt:
Senior secured notes		24,473		33,493
Other loans		34,458		29,687
Full recourse		76,572		5,000
Operating lease liabilities		2,743		0
Finance lease liabilities		3,068		0
Total current liabilities		376,476		361,944
Long-term debt, net of current portion:
Senior secured notes (less deferred financing costs of $6,317 and $7,434, respectively)		339,336		375,337
Other loans (less deferred financing costs of $10,482 and $9,354, respectively)		317,395		320,242
Senior unsecured bonds (less deferred financing costs of $675 and $758, respectively)		286,453		303,575
Other loans (less deferred financing costs of $1,519 and $921, respectively)		68,747		41,579
Operating lease liabilities		14,008		0
Finance lease liabilities		11,209		0
Liability associated with sale of tax benefits		123,468		69,893
Deferred lease income		1,201		48,433
Deferred income taxes		97,126		61,323
Liability for unrecognized tax benefits		14,643		11,769
Liabilities for severance pay		18,751		17,994
Asset retirement obligation		50,183		39,475
Other long-term liabilities		6,838		16,087
Total liabilities		1,725,834		1,667,651
Commitments and contingencies (Note 22)
Redeemable noncontrolling interest		9,250		8,603
Equity:
Common stock, par value $0.001 per share; 200,000,000 shares authorized; 51,031,652 and 50,699,781 issued and outstanding as of December 31, 2019 and December 31, 2018, respectively		51		51
Additional paid-in capital		913,150		901,363
Retained earnings		487,873		422,222
Accumulated other comprehensive loss		(8,654)		(3,799)
Total stockholders' equity attributable to Company's stockholders		1,392,420		1,319,837
Noncontrolling interest		122,990		125,259
Total equity		1,515,410		1,445,096
Total liabilities, redeemable noncontrolling interest and equity		$ 3,250,494		$ 3,121,350
[1]	Contract assets and contract liabilities are presented as "Costs and estimated earnings in excess of billings on uncompleted contracts" and "Billings in excess of costs and estimated earnings on uncompleted contracts", respectively, on the consolidated balance sheets. The contract liabilities balance at the beginning of the year was fully recognized as product revenues during the years ended December 31, 2019 and 2018 as a result of performance obligations satisfied.
[2]	Electricity segment assets include goodwill in the amount of $20.1 million, $20.0 million and $7.6 as of December 31, 2019, 2018 and 2017, respectively. No goodwill is included in the Product and Energy Storage and Management Services segment assets as of December 31, 2019 and 2018. Energy Storage and Management Services segment assets as December 31, 2017 include goodwill in the amount of $13.5 million. For further information on goodwill, see Note 9 - Intangible assets and goodwill to the consolidated financial statements.
[3]	Including unconsolidated investments 81,140 — — 81,140
[4]	Including unconsolidated investments 34,084 — — 34,084

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Property, plant and equipment, net	$ 1,971,415	$ 1,959,578
Construction-in-process	376,555	261,690
Operating leases right of use	17,405	0
Finance leases right of use	$ 14,161	$ 0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	200,000,000	200,000,000
Common stock, shares issued (in shares)	51,031,652	50,699,781
Common stock, shares outstanding (in shares)	51,031,652	50,699,781
Senior Secured Notes [Member]
Deferred financing costs	$ 6,317	$ 7,434
Other Loans, Limited and Non-recourse [Member]
Deferred financing costs	10,482	9,354
Senior Unsecured Bonds [Member]
Deferred financing costs	675	758
Other Loans, Full Recourse [Member]
Deferred financing costs	1,519	921
Variable Interest Entity [Member]
Property, plant and equipment, net	1,880,547	1,859,228
Construction-in-process	149,830	$ 104,085
Operating leases right of use	4,688
Finance leases right of use	$ 8,479

Consolidated Statements of Oper

Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues:
Revenue	[1]	$ 746,044	$ 719,267	$ 692,812
Cost of revenues:
Cost of revenues		476,721	448,832	424,360
Gross profit		269,323	270,435	268,452
Operating expenses:
Research and development expenses		4,647	4,183	3,157
Selling and marketing expenses		15,047	19,802	15,600
General and administrative expenses		55,833	47,750	42,881
Impairment charge		0	13,464	0
Write-off of unsuccessful exploration activities		0	126	1,796
Operating income		193,796	185,110	205,018
Other income (expense):
Interest income		1,515	974	988
Interest expense, net		(80,384)	(70,924)	(54,142)
Derivatives and foreign currency transaction gains (losses)		624	(4,761)	2,654
Income attributable to sale of tax benefits		20,872	19,003	17,878
Other non-operating income (expense), net		880	7,779	(1,666)
Income from operations before income tax and equity in earnings (losses) of investees		137,303	137,181	170,730
Income tax (provision) benefit		(45,613)	(34,733)	(21,664)
Equity in earnings (losses) of investees, net		1,853	7,663	(1,957)
Net income		93,543	110,111	147,109
Net income attributable to noncontrolling interest		(5,448)	(12,145)	(14,695)
Net income attributable to the Company's stockholders		88,095	97,966	132,414
Comprehensive income:
Net income		93,543	110,111	147,109
Other comprehensive income (loss), net of related taxes:
Change in foreign currency translation adjustments		(1,810)	(1,831)	3,440
Change in unrealized gains or losses in respect of the Company's share in derivatives instruments of unconsolidated investment		(3,417)	2,235	804
Change in respect of derivative instruments designated for cash flow hedge		75	81	135
Amortization of unrealized gains in respect of derivative instruments designated for cash flow hedge		(31)	(57)	(73)
Comprehensive income		88,360	110,539	151,415
Comprehensive income attributable to noncontrolling interest		(5,120)	(11,666)	(15,532)
Comprehensive income attributable to the Company's stockholders		$ 83,240	$ 98,873	$ 135,883
Basic:
Net income (in dollars per share)		$ 1.73	$ 1.93	$ 2.64
Diluted:
Net income (in dollars per share)		$ 1.72	$ 1.92	$ 2.61
Weighted average number of shares used in computation of earnings per share attributable to the Company's stockholders:
Basic (in shares)		50,867	50,643	50,110
Diluted (in shares)		51,227	50,969	50,769
Electricity [Member]
Revenues:
Revenue		$ 540,333	$ 509,879	$ 465,593
Cost of revenues:
Cost of revenues		312,835	298,255	266,840
Product [Member]
Revenues:
Revenue		191,009	201,743	224,483
Cost of revenues:
Cost of revenues		145,974	140,697	152,094
Energy Storage and Management Services [Member]
Revenues:
Revenue		14,702	7,645	2,736
Cost of revenues:
Cost of revenues		$ 17,912	$ 9,880	$ 5,426
[1]	Revenues as reported in the geographic area in which they originate.

Consolidated Statements of Equi

Consolidated Statements of Equity - USD ($) shares in Thousands, $ in Thousands	ORTP Class B Membership [Member]Common Stock [Member]	ORTP Class B Membership [Member]Additional Paid-in Capital [Member]	ORTP Class B Membership [Member]Retained Earnings [Member]	ORTP Class B Membership [Member]AOCI Attributable to Parent [Member]	ORTP Class B Membership [Member]Parent [Member]	ORTP Class B Membership [Member]Noncontrolling Interest [Member]	ORTP Class B Membership [Member]	OPC Class B Membership [Member]Common Stock [Member]	OPC Class B Membership [Member]Additional Paid-in Capital [Member]	OPC Class B Membership [Member]Retained Earnings [Member]	OPC Class B Membership [Member]AOCI Attributable to Parent [Member]	OPC Class B Membership [Member]Parent [Member]	OPC Class B Membership [Member]Noncontrolling Interest [Member]	OPC Class B Membership [Member]	Guadeloupe 1 [Member]Common Stock [Member]	Guadeloupe 1 [Member]Additional Paid-in Capital [Member]	Guadeloupe 1 [Member]Retained Earnings [Member]	Guadeloupe 1 [Member]AOCI Attributable to Parent [Member]	Guadeloupe 1 [Member]Parent [Member]	Guadeloupe 1 [Member]Noncontrolling Interest [Member]	Guadeloupe 1 [Member]	Tungsten [Member]Common Stock [Member]	Tungsten [Member]Additional Paid-in Capital [Member]	Tungsten [Member]Retained Earnings [Member]	Tungsten [Member]AOCI Attributable to Parent [Member]	Tungsten [Member]Parent [Member]	Tungsten [Member]Noncontrolling Interest [Member]	Tungsten [Member]	McGinness Hills Phase III [Member]Common Stock [Member]	McGinness Hills Phase III [Member]Additional Paid-in Capital [Member]	McGinness Hills Phase III [Member]Retained Earnings [Member]	McGinness Hills Phase III [Member]AOCI Attributable to Parent [Member]	McGinness Hills Phase III [Member]Parent [Member]	McGinness Hills Phase III [Member]Noncontrolling Interest [Member]	McGinness Hills Phase III [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Parent [Member]	Noncontrolling Interest [Member]	Total
Balance (in shares) at Dec. 31, 2016																																				49,667
Balance at Dec. 31, 2016																																				$ 50	$ 869,463	$ 215,352	$ (8,175)	$ 1,076,690	$ 91,582	$ 1,168,272
Stock-based compensation																																				$ 0	8,760	0	0	8,760	0	8,760
Exercise of options by employees and directors (in shares)																																				942
Exercise of options by employees and directors																																				$ 1	16,111	0	0	16,112	0	16,112
Cash paid to noncontrolling interest																																				0	0	0	0	0	(21,313)	(21,313)
Cash dividend declared																																				0	0	(20,511)	0	(20,511)	0	(20,511)
Buyout of Class B membership	$ 0	$ 2,913	$ 0	$ 0	$ 2,913	$ (6,964)	$ (4,051)	$ 0	$ (8,469)	$ 0	$ 0	$ (8,469)	$ 6,537	$ (1,932)
Net income																																				0	0	132,414	0	132,414	13,643	146,057
Change in foreign currency translation adjustments																																				0	0	0	2,603	2,603	837	3,440
Change in respect of derivative instruments designated for cash flow hedge																																				0	0	0	135	135	0	135
Change in unrealized gains or losses in respect of the Company's share in derivative instruments of unconsolidated investment																																				0	0	0	804	804	0	804
Amortization of unrealized gains in respect of derivative instruments designated for cash flow hedge																																				$ 0	0	0	(73)	(73)	0	(73)
Balance (in shares) at Dec. 31, 2017																																				50,609
Balance at Dec. 31, 2017																																				$ 51	888,778	327,255	(4,706)	1,211,378	84,322	1,295,700
Stock-based compensation																																				$ 0	10,218	0	0	10,218	0	10,218
Exercise of options by employees and directors (in shares)																																				91
Exercise of options by employees and directors																																				$ 0	0	0	0	0	0	0
Cash paid to noncontrolling interest																																				0	0	0	0	0	(10,972)	(10,972)
Cash dividend declared																																				0	0	(26,834)	0	(26,834)	0	(26,834)
Net income																																				0	0	97,966	0	97,966	11,155	109,121
Change in foreign currency translation adjustments																																				0	0	0	(1,352)	(1,352)	(479)	(1,831)
Change in respect of derivative instruments designated for cash flow hedge																																				0	0	0	81	81	0	81
Change in unrealized gains or losses in respect of the Company's share in derivative instruments of unconsolidated investment																																				0	0	0	2,235	2,235	0	2,235
Amortization of unrealized gains in respect of derivative instruments designated for cash flow hedge																																				0	0	0	(57)	(57)	0	(57)
Cumulative effect of changes in accounting principles at Dec. 31, 2017																																				0	0	23,835	0	23,835	0	23,835
Adjusted balance as of the beginning of the year at Dec. 31, 2017																																				51	888,778	351,090	(4,706)	1,235,213	84,322	1,319,535
Increase in noncontrolling interest															$ 0	$ 0	$ 0	$ 0	$ 0	$ 5,339	$ 5,339	$ 0	$ 0	$ 0	$ 0	$ 0	$ 996	$ 996
Tax effect of partnership interest buyout																																				0	2,367	0	0	2,367	0	2,367
Purchase of U.S. Geothermal																																				$ 0	0	0	0	0	34,898	34,898
Balance (in shares) at Dec. 31, 2018																																				50,700
Balance at Dec. 31, 2018																																				$ 51	901,363	422,222	(3,799)	1,319,837	125,259	1,445,096
Stock-based compensation																																				$ 0	9,358	0	0	9,358	0	9,358
Exercise of options by employees and directors (in shares)																																				332
Exercise of options by employees and directors																																				$ 0	2,429	0	0	2,429	0	2,429
Cash paid to noncontrolling interest																																				0	0	0	0	0	(8,329)	(8,329)
Cash dividend declared																																				0	0	(22,386)	0	(22,386)	0	(22,386)
Net income																																				0	0	88,095	0	88,095	4,316	92,411
Change in foreign currency translation adjustments																																				0	0	0	(1,482)	(1,482)	(328)	(1,810)
Change in respect of derivative instruments designated for cash flow hedge																																				0	0	0	75	75	0	75
Change in unrealized gains or losses in respect of the Company's share in derivative instruments of unconsolidated investment																																				0	0	0	(3,417)	(3,417)	0	(3,417)
Amortization of unrealized gains in respect of derivative instruments designated for cash flow hedge																																				0	0	0	(31)	(31)	0	(31)
Cumulative effect of changes in accounting principles at Dec. 31, 2018																																				0	0	(58)	0	(58)	0	(58)
Adjusted balance as of the beginning of the year at Dec. 31, 2018																																				$ 51	901,363	422,164	(3,799)	1,319,779	125,259	1,445,038
Increase in noncontrolling interest																													$ 0	$ 0	$ 0	$ 0	$ 0	$ 2,072	$ 2,072
Balance (in shares) at Dec. 31, 2019																																				51,032
Balance at Dec. 31, 2019																																				$ 51	$ 913,150	$ 487,873	$ (8,654)	$ 1,392,420	$ 122,990	$ 1,515,410

Consolidated Statements of Eq_2

Consolidated Statements of Equity (Parentheticals) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Retained Earnings [Member]
Cash dividend declared, per share (in dollars per share)	$ 0.44	$ 0.53	$ 0.41
Amortization of unrealized gains, tax		$ 18	$ 46
Cash dividend declared, per share (in dollars per share)	$ 0.44	$ 0.53	$ 0.44
Loss in respect of derivative instruments designated for cash flow hedge, related tax		$ 24
Change in unrealized gains or losses in respect of the Company's share in derivative instruments of unconsolidated investment, tax		$ 0

Consolidated Statements of Cash

Consolidated Statements of Cash Flows $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Cash flows from operating activities:
Net income	$ 93,543	$ 110,111	$ 147,109
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	148,761	132,233	115,146
Accretion of asset retirement obligation	2,709	2,474	1,874
Stock-based compensation	9,358	10,218	8,760
Amortization of deferred lease income	(2,685)	(2,685)	(2,685)
Income attributable to sale of tax benefits, net of interest expense	(10,084)	(8,609)	(11,956)
Equity in losses (earnings) of investees, net	(1,853)	(7,663)	1,957
Mark-to-market of derivative instruments	(1,402)	2,032	(1,473)
Write-off of unsuccessful exploration activities	0	126	1,796
Goodwill, Impairment Loss	0	13,464	0
Loss (gain) on severance pay fund asset	(1,016)	1,186	(1,746)
Deferred income tax provision	27,896	19,360	(41,147)
Liability for unrecognized tax benefits	2,874	2,879	3,270
Deferred lease revenues	(574)	(402)	(356)
Gain from insurance recoveries	0	(4,463)	0
Other	914	100	737
Changes in operating assets and liabilities, net of businesses acquired:
Receivables	(15,133)	(29,928)	(24,040)
Costs and estimated earnings in excess of billings on uncompleted contracts	3,765	(1,185)	11,253
Inventories	5,500	(9,318)	(1,070)
Prepaid expenses and other	3,452	(11,172)	208
Change in operating lease right of use asset	8,167	0	0
Deposits and other	(22,525)	18	(2,570)
Accounts payable and accrued expenses	8,738	(56,724)	51,641
Billings in excess of costs and estimated earnings on uncompleted contracts	(15,647)	(1,839)	(11,389)
Liabilities for severance pay	757	(3,147)	2,541
Change in operating lease liabilities	(8,405)	0	0
Other liabilities, net	(617)	(11,244)	(2,285)
Net cash provided by operating activities	236,493	145,822	245,575
Cash flows from investing activities:
Capital expenditures	(279,986)	(258,521)	(259,234)
Cash received from insurance recoveries	35,435	10,427	0
Investment in unconsolidated companies	(10,674)	(3,800)	(46,318)
Buyout of Class B membership in ORTP	0	0	(2,400)
Buyout of Class B membership in OPC	0	2,367	(1,932)
Cash paid for acquisition of controlling interest in a subsidiary, net of cash acquired	0	(95,093)	(35,300)
Intangible assets acquired	0	0	(868)
Decrease (increase) in severance pay fund asset, net of payments made to retired employees	687	2,186	526
Net cash used in investing activities	(254,538)	(342,434)	(345,526)
Cash flows from financing activities:
Proceeds from sale of membership interests to noncontrolling interest, net of transaction costs	0	3,174	0
Proceeds from long-term loans, net of transaction costs	132,847	214,700	0
Proceeds from exercise of options by employees	2,429	0	16,111
Proceeds from the sale of limited liability company interest, net of transaction costs	58,289	32,175	0
Prepayment of long-term debt	(21,073)	0	(14,270)
Proceeds from issuance of commercial paper	50,000	0	0
Proceeds from revolving credit lines with banks	1,450,850	4,097,000	1,097,500
Repayment of revolving credit lines with banks	(1,569,300)	(3,989,500)	(1,046,000)
Cash received from noncontrolling interest	3,346	4,134	2,017
Cash paid for achievement of production threshold in GB	0	0	(8,032)
Repayments of long-term debt	(72,708)	(62,774)	(66,223)
Cash paid to noncontrolling interest	(9,730)	(13,106)	(21,313)
Payments under finance lease obligations	(3,164)	(2,551)	(1,871)
Deferred debt issuance costs	(5,165)	(5,287)	(5,290)
Cash dividends paid	(22,386)	(26,834)	(20,511)
Net cash provided by (used in) financing activities	(5,765)	251,131	(67,882)
Effect of exchange rate changes	(575)	(660)	0
Net change in cash and cash equivalents and restricted cash and cash equivalents	(24,385)	53,859	(167,833)
Restricted cash and cash equivalents acquired in a business combination	0	26,993	0
Cash and cash equivalents and restricted cash and cash equivalents at beginning of period	177,495	96,643	264,476
Cash and cash equivalents and restricted cash and cash equivalents at end of period	153,110	177,495	96,643
Supplemental disclosure of cash flow information:
Interest, net of interest capitalized	61,628	53,864	40,484
Income taxes, net	1,649	18,028	21,878
Supplemental non-cash investing and financing activities:
Increase (decrease) in accounts payable related to purchases of property, plant and equipment	9,423	(6,878)	4,484
Right of use assets obtained in exchange for new lease liabilities	11,626	8,584	0
Increase in asset retirement cost and asset retirement obligation	$ 8,334	$ 881	$ 1,888

Note 1 - Business and Significa

Note 1 - Business and Significant Accounting Policies	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	NOTE 1 Business The Company is primarily engaged in the geothermal and recovered energy business, including the supply of equipment that is manufactured by the Company and the design and construction of power plants for projects owned by the Company or for third Most of the Company’s domestic power plant facilities are Qualifying Facilities under the PURPA. The Power Purchase Agreements ("PPAs") for certain of such facilities are dependent upon their maintaining Qualifying Facility status. Management believes that all of the facilities located in the United States were in compliance with Qualifying Facility status requirements as of December 31, 2019. Cash dividends During the years ended December 31, 2019, 2018 2017, Rounding Dollar amounts, except per share data, in the notes to these financial statements are rounded to the closest $1,000, Basis of presentation The consolidated financial statements are prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) and include the accounts of the Company and of all majority-owned subsidiaries in which the Company exercises control over operating and financial policies, and variable interest entities in which the Company has an interest and is the primary beneficiary. Intercompany accounts and transactions have been eliminated in consolidation. Investments in less-than-majority-owned entities or other entities in which the Company exercises significant influence over operating and financial policies are accounted for using the equity method of accounting or consolidated if they are a variable interest entity in which the Company has an interest and is the primary beneficiary. Under the equity method, original investments are recorded at cost and adjusted by the Company’s share of undistributed earnings or losses of such companies. The Company’s earnings or losses in investments accounted for under the equity method have been reflected as “equity in earnings (losses) of investees, net” on the Company’s consolidated statements of operations and comprehensive income (loss). Cash and cash equivalents The Company considers all highly liquid instruments, with an original maturity of three Restricted cash, cash equivalents, and marketable securities Under the terms of certain long-term debt agreements, the Company is required to maintain certain debt service reserves, cash collateral and operating fund accounts that have been classified as restricted cash and cash equivalents. Funds that will be used to satisfy obligations due during the next 12 Reconciliation of cash and cash equivalents and restricted cash and cash equivalents The following table provides a reconciliation of cash and cash equivalents and restricted cash and cash equivalents reported on the balance sheet that sum to the total of the same amounts shown on the statement of cash flows: December 31, 2019 2018 2017 (Dollars in thousands) Cash and cash equivalents $ 71,173 $ 98,802 $ 47,818 Restricted cash and cash equivalents 81,937 78,693 48,825 Total cash and cash equivalents and restricted cash and cash equivalents $ 153,110 $ 177,495 $ 96,643 Concentration of credit risk Financial instruments which potentially subject the Company to concentration of credit risk consist principally of temporary cash investments and accounts receivable. The Company places its temporary cash investments with high credit quality financial institutions located in the U.S. and in foreign countries. At December 31, 2019 2018, ten $250,000 December 31, 2019 2018, not At December 31, 2019 2018, December 31, 2019 2018, 19 The Company has historically been able to collect substantially all of its receivable balances. As of December 31, 2019, January February 2020. September 30, 2019. May 2019, December 31, 2019, October 2018 April 2019 none Additionally, Pacific Gas and Electric Corporation (“PG&E Corporation”) and its subsidiary Pacific Gas and Electric Company (“PG&E”), which accounted for 1.5%, 1.9% and 2.0% of the Company's total revenues for the years ended December 31, 2019, 2018 2017, 2017 2018. January 29, 2019, 11 December 31, 2019, December 2019 January 2020. Inventories Inventories consist primarily of raw material parts and sub-assemblies for power units and are stated at the lower of cost or net realizable value, using the weighted-average cost method. Inventories are reduced by a provision for slow-moving and obsolete inventories. This provision was not December 31, 2019 2018. Deposits and other Deposits and other consist primarily of performance bonds for construction projects, long-term insurance contract and receivables, certain deferred costs and derivative instruments. Property, plant and equipment, net Property, plant and equipment are stated at cost. All costs associated with the acquisition, development and construction of power plants operated by the Company are capitalized. Major improvements are capitalized and repairs and maintenance (including major maintenance) costs are expensed. Power plants operated by the Company, which include geothermal wells and exploration and resource development costs, are depreciated using the straight-line method over their estimated useful lives, which range from 15 to 30 years. The other assets are depreciated using the straight-line method over the following estimated useful lives of the assets: Buildings (in years) 25 Leasehold improvements (in years) 15 - 20 Machinery and equipment — manufacturing and drilling (in years) 10 Machinery and equipment — computers (in years) 3 - 5 Office equipment — furniture and fixtures (in years) 5 - 15 Office equipment — other (in years) 5 - 10 Vehicles (in years) 5 - 7 The cost and accumulated depreciation of items sold or retired are removed from the accounts. Any resulting gain or loss is recognized currently and recorded in the accompanying statements of operations. The Company capitalizes interest costs as part of constructing power plant facilities. Such capitalized interest is recorded as part of the asset to which it relates and is amortized over the asset’s estimated useful life. Capitalized interest costs amounted to $3.3 million, $3.7 million, and $7.2 million for the years ended December 31, 2019, 2018 2017, Exploration and development costs The Company capitalizes costs incurred in connection with the exploration and development of geothermal resources once it acquires land rights to the potential geothermal resource. Prior to acquiring land rights, the Company makes an initial assessment that an economically feasible geothermal reservoir is probable on that land. The Company determines the economic feasibility of potential geothermal resources internally, with all available data and external assessments vetted through the exploration department and occasionally using outside service providers. Costs associated with the initial assessment are expensed and included in cost of electricity revenues in the consolidated statements of operations and comprehensive income (loss). Such costs were immaterial during the years ended December 31, 2019, 2018 2017. two three may In most cases, the Company obtains the right to conduct the geothermal development and operations on land owned by the Bureau of Land Management ("BLM"), various states or with private parties. The up-front bonus payments and other related costs, such as legal fees, are capitalized and included in construction-in-process. The annual land lease payments made during the exploration, development and construction phase are expensed as incurred and included in “electricity cost of revenues” in the consolidated statements of operations and comprehensive income (loss). Upon commencement of power generation on the leased land, the Company begins to pay the lessor’s long-term royalty payments based on the utilization of the geothermal resources as defined in the respective agreements. Such payments are expensed when the related revenues are earned and included in “electricity cost of revenues” in the consolidated statements of operations and comprehensive income (loss). Following the acquisition of land rights to the potential geothermal resource, the Company conducts further studies and surveys, including water and soil analyses, among others, and augments its database with the results of these studies. The Company then initiates a suite of geophysical surveys to assess the resource and determine drilling locations. If the results of these activities support the initial assessment of the feasibility of the geothermal resource, the Company then proceeds to exploratory drilling and other related activities which may may not When deciding whether to continue holding lease rights and/or to pursue exploration activity, the Company diligently prioritizes prospective investments, taking into account resource and probability assessments in order to make informed decisions about whether a particular project will support commercial operation. As a result, write-off of unsuccessful activities for the years ended December 31, 2019, 2018 2017 2017, no Grants received from the U.S. DOE are offset against the related exploration and development costs. There were no December 31, 2019, 2018 2017. All exploration and development costs that are being capitalized, including the up-front bonus payments made to secure land leases, will be depreciated over their estimated useful lives when the related geothermal power plant is substantially complete and ready for use. A geothermal power plant is substantially complete and ready for use when electricity generation commences. Asset retirement obligation The Company records the fair value of a legal liability for an asset retirement obligation in the period in which it is incurred. The Company’s legal liabilities include plugging wells and post-closure costs of power producing sites. When a new liability for asset retirement obligations is recorded, the Company capitalizes the costs of the liability by increasing the carrying amount of the related long-lived asset. The liability is accreted to its present value each period, and the capitalized cost is depreciated over the useful life of the related asset. The Company periodically reassess the assumptions used to estimate the expected cash flows required to settle the asset retirement obligation, including changes in estimated probabilities, amounts, and timing of the settlement of the asset retirement obligation, as well as changes in the legal requirements of an obligation and revises the previously recorded asset retirement obligation accordingly. At retirement, the obligation is settled for its recorded amount at a gain or loss. Deferred financing costs Deferred financing costs are presented as a direct deduction from the carrying value of the associated debt liability or under deferred financing if associated with lines of credit. Such deferred costs are amortized over the term of the related obligation using the effective interest method or ratably, as applicable. Amortization of deferred financing costs is presented as interest expense in the consolidated statements of operations and comprehensive income (loss). Accumulated amortization related to deferred financing costs amounted to $19.5 million and $21.8 million at December 31, 2019 2018, December 31, 2019, 2018 2017 December 31, 2019, 2018 2017, Goodwill Goodwill represents the excess of the fair value of consideration transferred in the business combination transactions of Guadeloupe and USG over the fair value of tangible and intangible assets acquired, net of the fair value of liabilities assumed and the fair value of any noncontrolling interest in the acquisitions. Goodwill is not December 31 not first not no one not first January 2017, 2017 04, 350 2018, two two 2017 04, one not 9 Intangible assets Intangible assets consist of allocated acquisition costs of PPAs, which are amortized using the straight-line method over the 13 to 29-year terms of the agreements (see Note 9 may not no no not Impairment of long-lived assets and long-lived assets to be disposed of The Company evaluates long-lived assets, such as property, plant and equipment and construction-in-process for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not not not not The Company tests its operating plants that are operated together as a complex for impairment at the complex level because the cash flows of such plants result from significant shared operating activities. For example, the operating power plants in a complex are managed under a combined operation management generally with one one not not not Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to the estimated future net undiscounted cash flows expected to be generated by the asset. The significant assumptions that the Company uses in estimating its undiscounted future cash flows include: (i) projected generating capacity of the complex or power plant and rates to be received under the respective PPAs and expected market rates thereafter and (ii) projected operating expenses of the relevant complex or power plant. Estimates of future cash flows used to test recoverability of a long-lived asset under development also include cash flows associated with all future expenditures necessary to develop the asset. If the assets are considered to be impaired, the impairment to be recognized is measured by the amount by which the carrying amount of the assets exceeds their fair value. Assets to be disposed of are reported at the lower of the carrying amount or fair value less costs to sell. Management believes that no impairment exists for long-lived assets; however, estimates as to the recoverability of such assets may may Derivative instruments Derivative instruments (including certain derivative instruments embedded in other contracts) are measured at their fair value and recorded as either assets or liabilities unless exempted from derivative treatment as a normal purchase and sale. All changes in the fair value of derivatives are recognized in earnings unless specific hedge criteria are met, which requires a company to formally document, designate and assess the effectiveness of transactions that receive hedge accounting. The Company maintains a risk management strategy that may not Foreign currency translation The U.S. dollar is the functional currency for all of the Company’s consolidated operations and those of its equity affiliates except for the Guadeloupe power plant and the Company's operations in New Zealand. For those entities, all gains and losses from currency translations are included within the line item “Derivatives and foreign currency transaction gains (losses)” within the consolidated statements of operations and comprehensive income (loss). The Euro and New Zealand Dollar are the functional currencies of the Guadeloupe power plant and the Company's operations in New Zealand, respectively, and thus gains and losses from currency translation adjustments in those locations are included as currency translation adjustments in accumulated other comprehensive income in the consolidated statements of equity and in comprehensive income. The accumulated currency translation adjustments amounted to $1.5 million and $0.0 million as of December 31, 2019 2018, Comprehensive income (loss) reporting Comprehensive income (loss) includes net income or loss plus other comprehensive income (loss), which for the Company consists of changes in unrealized gains or losses in respect of the Company’s share in derivatives instruments of an unconsolidated investment, foreign currency translation adjustments and changes in respect of derivative instruments designated as a cash flow hedge. The changes in foreign currency translation adjustments and gains or losses in respect of derivative instruments designated as a cash flow hedge during the years ended December 31, 2019, 2018 2017 5 Revenues and cost of revenues Upon adoption of ASU 2014 09, 606 January 1, 2018, 1 2 3 4 5 Revenues are primarily related to: (i) sale of electricity from geothermal and recovered energy-based power plants owned and operated by the Company; (ii) geothermal and recovered energy-based power plant equipment engineering, sale, construction and installation, and operating services and (iii) energy storage, demand-response and energy management related services as well as services relating to the engineering, procurement, construction, operation and maintenance of energy storage units. Electricity segment revenues July 1, 2003, five 8 606, 30 60 Product segment revenues third not not no one two In contracts for which the Company determines that control is not Accounting for product contracts that are satisfied over time includes use of several estimates such as variable consideration related to bonuses and penalties and total estimated cost for completing the contract. The estimated amount of variable consideration will be included in the transaction price only to the extent that it is probable that a significant reversal in the amount of cumulative revenue recognized will not The nature of the Company's product contracts give rise to several modifications or change requests by its customers. Substantially all of the modifications are treated as cumulative catch-ups to revenues since the additional goods are not one Energy Storage and Management Services segment revenues 606 may The Company's accounting policy for revenues included under the 2017 Revenues related to the sale of electricity from geothermal and recovered energy-based power plants and capacity payments are recorded based upon output delivered and capacity provided at rates specified under relevant contract terms. For PPAs agreed to, modified, or acquired in business combinations on or after July 1, 2003, five 8 Revenues from engineering, operating services, and parts and product sales are recorded upon providing the service or delivery of the products and parts and when collectability is reasonably assured. Revenues from the supply and/or construction of geothermal and recovered energy-based power plant equipment and other equipment to third may In specific instances where there is a lack of dependable estimates or inherent risks that may Contract assets related to the Company's Product segment reflect revenues recognized and performance obligations satisfied in advance of customer billing. Contract liabilities related to the Company's Product segment reflect payments received in advance of the satisfaction of performance under the contract. The Company receives payments from customers based on the terms established in the contracts. Total contract assets and contract liabilities as of December 31, 2019 2018 December 31, December 31, 2019 2018 (Dollars in thousands) Contract assets (*) $ 38,365 $ 42,130 Contract liabilities (*) (2,755 ) (18,402 ) Contract assets, net $ 35,610 $ 23,728 (*) Contract assets and contract liabilities are presented as "Costs and estimated earnings in excess of billings on uncompleted contracts" and "Billings in excess of costs and estimated earnings on uncompleted contracts", respectively, on the consolidated balance sheets. The contract liabilities balance at the beginning of the year was fully recognized as product revenues during the years ended December 31, 2019 2018 The following table presents the significant changes in the contract assets and contract liabilities for the years ended December 31, 2019 2018: Years Ended December 31, 2019 2018 Contract assets Contract liabilities Contract assets Contract liabilities (Dollars in thousands) Recognition of contract liabilities as revenue as a result of performance obligations satisfied $ — $ 12,675 $ — $ 33,349 Cash received in advance for which revenues have not yet recognized, net of expenditures made — (3,323 ) — (38,162 ) Reduction of contract assets as a result of rights to consideration becoming unconditional (130,918 ) — (128,659 ) — Contract assets recognized, net of recognized receivables 133,448 — 136,496 — Net change in contract assets and contract liabilities $ 2,530 $ 9,352 $ 7,837 $ (4,813 ) The timing of revenue recognition, billings and cash collections results in accounts receivable, contract assets and contract liabilities on the consolidated balance sheet. In the Company's Products segment, amounts are billed as work progresses in accordance with agreed-upon contractual terms, or upon achievement of contractual milestones. Generally, billing occurs subsequent to the recognition of revenue, resulting in contract assets. However, the Company sometimes receives advances or deposits from its customers before revenue can be recognized, resulting in contract liabilities. These assets and liabilities are reported on the consolidated balance sheet on a contract-by-contract basis at the end of each reporting period. The timing of billing its customers and receiving advance payments vary from contract to contract. The majority of payments are received no On December 31, 2019, not The following schedule reconciles revenues accounted under lease accounting, and ASC 606, December 31, 2019 2018: Year Ended December 31, 2019 2018 (Dollars in thousands) Electricity Revenues accounted under lease accounting $ 479,059 $ 481,619 Electricity, Product and Energy Storage and Management Services revenues accounted under ASC 606 266,985 237,648 Total consolidated revenues $ 746,044 $ 719,267 Disaggregated revenues from contracts with customers for the years ended December 31, 2019 2018 19 Termination fee Fees to terminate PPAs are recognized in the period incurred as selling and marketing expenses. During 2018, 2 2018. 2019 2017, no Warranty on products sold The Company generally provides a one two December 31, 2019, 2018 2017. Research and development Research and development costs incurred by the Company for the development of existing and new geothermal and recovered energy power plants as well as storage related technologies are expensed as incurred. Grants received from the DOE are offset against the related research and development expenses. There were no December 31, 2019, 2018 2017. Stock-based compensation The Company accounts for stock-based compensation using the fair value method whereby compensation cost is measured at the grant date, based on the calculated fair value of the award, and is recognized as an expense over the requisite employee service period (generally the vesting period of the grant). The Company uses the Exercise Multiple-Based Lattice SAR-Pricing Model to value the stock-based compensation awards to reflect accumulated historic data retained of behavioral parameters. Tax monetization Transactions The Company has three 3 13 2017 13. 470. 810. 835 7. Income taxes Income taxes are accounted for using the asset and liability approach, which requires the recognition of taxes payable or refundable for the current year and deferred tax assets and liabilities for the future tax consequences of events that have been recognized in the Company’s financial statements or tax returns. The measurement of current and deferred tax assets and liabilities are based on provisions of the enacted tax law. The Company accounts for investment tax credits and production tax credits as a reduction to income taxes in the year in which the credit arises. The measurement of deferred tax assets is reduced, if necessary, by the amount of any tax benefits that, based on available evidence, are more likely than not not Earnings per share Basic earnings per share attributable to the Company’s stockholders (“earnings per share”) is computed by dividing net income or loss attributable to the Company’s stockholders by the weighted average number of shares of common stock outstanding for the period. The Company does not The table below shows the reconciliation of the number of shares used in the computation of basic and diluted earnings per share: Year Ended December 31, 2019 2018 2017 (In thousands) Weighted average number of shares used in computation of basic earnings per share 50,867 50,643 50,110 Add: Additional shares from the assumed exercise of employee stock options 360 326 659 Weighted average number of shares used in computation of diluted earnings per share 51,227 50,969 50,769 The number of stock-based awards that could potentially dilute future earnings per share and were not December 31, 2019, 2018 2017. Use of estimates in preparation of financial statements The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the dates of such financial statements and the reported amounts of revenues and expenses during the reporting periods. Actual results could differ from those estimates. The most significant estimates with regard to the Company’s consolidated financial statements relate to the useful lives of property, plant and equipment, impairment of goodwill and long-lived assets, including intangible assets, revenue recognition of product sales using the percentage of completion method, asset retirement obligations, and the provision for income taxes. Redeemable noncontrolling interest Changes in the carrying amount of the Company's Redeemable noncontrolling interest were as follows: 2019 2018 (Dollars in thousands) Redeemable noncontrolling interest as of January 1, $ 8,603 $ 6,416 Redeemable noncontrolling interest in results of operation of a consolidated subsidiary 1,132 990 Cash paid to noncontrolling interest (252 ) — Increase in share of redeemable noncontrolling interest — 1,528 Currency translation adjustments (233 ) (331 ) Redeemable noncontrolling interest as of December 31, $ 9,250 $ 8,603 Puna Power Plant On May 3, 2018, 38 three 2019, May 2018 2019, December 31, 2019. not As of February 2020, first 2020. one second 2020. third 2020 The Company continues to assess the accounting implications of this event on the assets and liabilities on its balance sheet and whether an impairment will be required. Any significant damage to the geothermal resource or continued shut-down following the lava event at the Puna facilities could have an adverse impact on the power plant's electricity generation and availability, which in turn could have a material adverse impact on the Company's business and results of operations. New Accounting Pronouncements New accounting pronouncements effective in the year ended December 31, 2019 Leases In February 2016, 2016 02, 842 two 606. January 1, 2019 no The Company is a lessee in operating lease transactions primarily consisting of land leases for its exploration and development activities as further described under Exploration and development costs above and the Puna power plant transaction as further described under Note 12 842, In accordance with the new standard, for agreements in which the Company is the lessee, the Company applies a unified accounting model by which it recognizes a right-of-use asset ("ROU") and a lease liability at the commencement date of the lease contract for all the leases in which the Company has a right to control identified assets for a specified period of time. The classification of the lease as a finance lease or an operating lease determines the subsequent accounting for the lease arrangement. Upon the adoption of the new standard the Company, both as a lessee and as a lessor, chose to apply the following permitted practical expedients: 1. Not 2. Not 840 840 3. Exclude initial direct costs from measurement of the ROU asset at the date of initial application; 4. Applying the practical expedient (for a lessor) to not 606 606. 5. Applying the practical expedient (for a lessee) regarding the recognition and measurement of short-term leases, for leases for a period of up to 12 Since the Company elected to apply the practical expedients above, it applied the new standard to all contracts entered into before January 1, 2019 840. The new significant accounting policies regarding leases that were applied as from January 1, 2019 1. Determining whether an arrangement contains a lease On the inception date of the lease, the Company determines whether the arrangement is a lease or contains a lease, while examining if it conveys the right to control the use of an identified asset for a period of time in exchange for consideration. 2. The Company as a lessee a. Lease classification: At the commencement date, a lease is a finance lease if it meets any one • The lease transfers ownership of the underlying asset to the lessee by the end of the lease term. • The lease grants the lessee an option to purchase the underlying asset that the lessee is reasonably certain to exercise. • The lease term is for the major part of the remaining economic life of the underlying asset. • The present value of the sum of the lease payments and any residual value guaranteed by the lessee that is not • The underlying asset is of such a specialized nature that it is expected to have no b. Leased assets and lease liabilities - initial recognition Upon initial recognition, the Company recognizes a liability at the present value of the lease payments to be made over the lease term, and concurrently recognizes a ROU asset at the same amount of the liability, adjusted for any prepaid or accrued lease payments, plus initial direct costs incurred in respect of the lease. Since the interest rate implicit in the lease is not c. The lease term The lease term is the non-cancellable period of the lease plus periods covered by an extension or termination option if it is reasonably certain that the Company will exercise the option. d. Subsequent measurement of operating leases After lease commencement, the Company measures the lease liability at the present value of the remaining lease payments using the discount rate determined at lease commencement (as long as the discount rate has not The Company subsequently measures the ROU asset at the present value of the remaining lease payments, adjusted for the remaining balance of any lease incentives received, any cumulative prepaid or accrued rent if the lease payments are uneven throughout the lease term and any unamortized initial direct costs. Further, the Company will recognize lease expense on a straight-line basis over the lease term. e. Subsequent measurement of finance leases After lease commencement, the Company measures the lease liability by increasing the carrying amount to reflect interest on the lease liability and reducing the carrying amount to reflect the lease payments made during the period. The Company shall determine the interest on the lease liability in each period during the lease term as the amount that produces a constant periodic discount rate on the remaining balance of the liability, taking into consideration the reassessment requirements. After lease commencement, the Company measures the ROU assets at cost less any accumulated amortization and any accumulated impairment losses, taking into consideration the reassessment requirements. The Company amortizes the ROU asset on a straight-line basis, unless another systematic basis better represents the pattern in which the Company expects to consume the ROU asset’s future economic benefits. The ROU asset is amortized over the shorter of the lease term or the useful life of the ROU asset as follows: (in years) Land 1 - 35 Vehicles 5 Building 15 The total periodic expense (the sum of interest and amortization expense) of a finance lease is typically higher in the early periods and lower in the later periods. f. Variable lease payments: Variable lease payments that depend on an index or a rate On the commencement date, the lease payments shall include variable lease payments that depend on an index or a rate (such as the Consumer Price Index or a market interest rate), initially measured using the index or rate at the commencement date. The Company does not Other variable lease payments: Variable payments that depends on performance or use of the underlying asset are not 3. The Company as a lessor At lease commencement, the Company as a lessor classifies leases as either finance or operating leases. Finance leases are further classified as a sales-type lease or as a direct financing lease. Under an operating lease, the Company recognizes the lease payment as income over the lease term, generally on a straight-line basis or as earned. 4. Impact of the new standard a) The effects of the initial application of the new standard on the Company's cons

Note 2 - Business Acquisitions

Note 2 - Business Acquisitions and Others	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Business Combination Disclosure [Text Block]	NOTE 2 Ijen transaction On July 2, 2019, fourth 2019, 323 USG transaction On April 24, 2018, • three 38 • development assets which include a project at the Geysers, California; a second As a result of the acquisition, the Company expanded its overall generation capacity and improved the profitability of the purchased assets through cost reduction and synergies. The Company accounted for the transaction in accordance with Accounting Standard Codification ASC 805, 810, The following table summarizes the purchase price allocation to the fair value of the assets acquired and liabilities assumed (in millions): Cash and cash equivalents and restricted cash $ 37.9 Property, plant and equipment and construction-in-process 77.3 Intangible assets (1) 127.0 Goodwill (2) 12.7 Deferred taxes 1.7 Total assets acquired $ 256.6 Other working capital $ (8.2 ) Long-term term debt (98.3 ) Asset retirement obligation (9.0 ) Noncontrolling interest (34.9 ) Total liabilities assumed $ (150.4 ) Total assets acquired, and liabilities assumed, net $ 106.2 ( 1 Intangible assets are primarily related to long-term electricity power purchase agreements and depreciated over an average of 19 years. ( 2 Goodwill is primarily related to the expected synergies in operations as a result of the purchase transaction. The goodwill is allocated to the Electricity segment and not The fair value of the noncontrolling interest of $34.9 million reflects the 40% minority interests in the Neal Hot Springs project that was evaluated using the income approach. The fair value of the noncontrolling interest was based on the following significant inputs: (i) forecasted cash flows assumed to be generated in correspondence with the remaining life of the related power purchase agreement which is approximately 20 years; (ii) revenues were estimated in accordance with the price and generation capacity of the related power purchase agreement; (iii) assumed terminal value based on the realizable value of the project at the end of the power purchase agreement term; and (iv) assumed discount rate of approximately 9%. Total Electricity revenues and operating profit related to the three December 31, 2018 December 31, 2018. January 1, 2017: Pro forma for the Pro forma for the year ended December 31, 2018 year ended December 31, 2017 (Dollars in thousands) Electricity revenues $ 521,175 $ 497,650 Total revenues 730,563 724,869 Income from continuing operations before income taxes and equity in losses of investees 134,142 169,546 Viridity transaction On March 15, 2017, 2017 2020. first 2017 not December 31, 2018 second 2020 not 2017 2018, The Company accounted for the transaction in accordance with Accounting Standard Codification 805, 810, In 2018, 9

Note 3 - Inventories

Note 3 - Inventories	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Inventory Disclosure [Text Block]	NOTE 3 Inventories consist of the following: December 31, 2019 2018 (Dollars in thousands) Raw materials and purchased parts for assembly $ 21,942 $ 26,914 Self-manufactured assembly parts and finished products 13,007 18,110 Total $ 34,949 $ 45,024

Note 4 - Cost and Estimated Ear

Note 4 - Cost and Estimated Earnings on Uncompleted Contracts	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Long-term Contracts or Programs Disclosure [Text Block]	NOTE 4 Cost and estimated earnings on uncompleted contracts consist of the following: December 31, 2019 2018 (Dollars in thousands) Costs and estimated earnings incurred on uncompleted contracts $ 196,550 $ 278,797 Less billings to date (160,940 ) (255,069 ) Total $ 35,610 $ 23,728 These amounts are included in the consolidated balance sheets under the following captions: December 31, 2019 2018 (Dollars in thousands) Costs and estimated earnings in excess of billings on uncompleted contracts $ 38,365 $ 42,130 Billings in excess of costs and estimated earnings on uncompleted contracts (2,755 ) (18,402 ) Total $ 35,610 $ 23,728 The completion costs of the Company’s construction contracts are subject to estimation. Due to uncertainties inherent in the estimation process, it is reasonably possible that estimated contract earnings will be further revised in the near term.

Note 5 - Investment in an Uncon

Note 5 - Investment in an Unconsolidated Company	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Equity Method Investments and Joint Ventures Disclosure [Text Block]	NOTE 5 Investment in unconsolidated companies mainly consists of the following: December 31, 2019 2018 (Dollars in thousands) Sarulla $ 70,589 $ 71,983 Ijen 10,551 — Total investment in unconsolidated companies $ 81,140 $ 71,983 The Sarulla Complex The Company holds a 12.75% equity interest in a consortium that developed the 330 MW Sarulla geothermal power plant project in Tapanuli Utara, North Sumatra, Indonesia. The Sarulla project is comprised of three separately constructed 110 MW units, the most recent of which, NIL 2, April 2018. April 4, 2013. During the years ended December 31, 2019 2018, The Sarulla consortium entered into interest rate swap agreements with various international banks, effective as of June 4, 2014, Year Ended December 31, 2019 2018 (Dollars in thousands) Change, net of deferred tax, in unrealized gains (losses) in respect of the Company’s share in derivative instruments of unconsolidated investment $ (3,417 ) $ 2,235 The related accumulated loss recorded by the Company under accumulated other comprehensive income (loss) as of December 31, 2019 2018 The Ijen Project For details on the Ijen project, please see Note 2

Note 6 - Variable Interest Enti

Note 6 - Variable Interest Entities	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Disclosure Of Variable Interest Entities [Text Block]	NOTE 6 The Company’s overall methodology for evaluating transactions and relationships under the variable interest entity (“VIE”) accounting and disclosure requirements includes the following two In performing the first • The design of the entity, including the nature of its risks and the purpose for which the entity was created, to determine the variability that the entity was designed to create and distribute to its interest holders; • The nature of the Company’s involvement with the entity; • Whether control of the entity may not • Whether there is sufficient equity investment at risk to finance the activities of the entity; and • Whether parties other than the equity holders have the obligation to absorb expected losses or the right to receive residual returns. If the Company identifies a VIE based on the above considerations, it then performs the second • Whether the Company has the power to direct the activities of the VIE that most significantly impact the entity’s economic performance; and • Whether the Company has the obligation to absorb losses of the entity that could potentially be significant to the VIE or the right to receive benefits from the entity that could potentially be significant to the VIE. The Company’s VIEs include certain of its wholly owned subsidiaries that own one not may The tables below detail the assets and liabilities (excluding intercompany balances which are eliminated in consolidation) for the Company’s VIEs, combined by VIE classifications, that were included in the consolidated balance sheets as of December 31, 2019 2018: December 31, 2019 Project Debt PPAs (Dollars in thousands) Assets: Restricted cash and cash equivalents $ 81,522 $ 20 Other current assets 164,386 29,076 Property, plant and equipment, net 1,211,656 668,891 Construction-in-process 10,188 139,642 Other long-term assets 162,995 40,138 Total assets $ 1,630,747 $ 877,767 Liabilities: Accounts payable and accrued expenses 25,361 13,201 Long-term debt 794,214 — Other long-term liabilities 126,851 32,790 Total liabilities 946,426 45,991 December 31, 2018 Project Debt PPAs (Dollars in thousands) Assets: Restricted cash and cash equivalents $ 76,019 2,304 Other current assets 213,007 9,698 Property, plant and equipment, net 1,552,408 306,820 Construction-in-process 90,812 13,273 Other long-term assets 177,723 9,104 Total assets $ 2,109,969 341,199 Liabilities: Accounts payable and accrued expenses $ 24,245 2,651 Long-term debt 805,850 — Other long-term liabilities 125,769 12,483 Total liabilities $ 955,864 15,134

Note 7 - Fair Value of Financia

Note 7 - Fair Value of Financial Instruments	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Fair Value Disclosures [Text Block]	NOTE 7— The fair value measurement guidance clarifies that fair value is an exit price, representing the amount that would be received upon selling an asset or paid upon transferring a liability in an orderly transaction between market participants. As such, fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or liability. The guidance establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 3 three Level 1 Level 2 not Level 3 no The following table sets forth certain fair value information at December 31, 2019 2018 December 31, 2019 Fair Value Carrying Value at December 31, 2019 Total Level 1 Level 2 Level 3 (Dollars in thousands) Assets: Current assets: Cash equivalents (including restricted cash accounts) $ 28,316 $ 28,316 $ 28,316 $ — $ — Derivatives: Contingent receivable (1) 102 102 — — 102 Currency forward contracts (2) 362 362 — 362 — Liabilities: Current liabilities: Derivatives: Contingent payables (1) (3,359 ) (3,359 ) — — (3,359 ) $ 25,421 $ 25,421 $ 28,316 $ 362 $ (3,257 ) December 31, 2018 Fair Value Carrying Value at December 31, 2018 Total Level 1 Level 2 Level 3 (Dollars in thousands) Assets Current assets: Cash equivalents (including restricted cash accounts) $ 18,787 $ 18,787 $ 18,787 $ — $ — Derivatives: Contingent receivable (1) 104 104 — — 104 Liabilities: Current liabilities: Derivatives: Contingent payables (1) (3,424 ) (3,424 ) — — (3,424 ) Currency forward contracts (2) (1,040 ) (1,040 ) — (1,040 ) — $ 14,427 $ 14,427 $ 18,787 $ (1,040 ) $ (3,320 ) ( 1 December 31, 2019 2018 ( 2 December 31, 2019 December 31, 2018, The amounts set forth in the tables above include investments in debt instruments and money market funds (which are included in cash equivalents). Those securities and deposits are classified within Level 1 The following table presents the amounts of gain (loss) recognized in the consolidated statements of operations and comprehensive income (loss) on derivative instruments not Derivatives not designated as hedging instruments Location of recognized gain (loss) Amount of recognized gain (loss) 2019 2018 2017 (Dollars in thousands) Put options on natural gas price Derivative and foreign currency transaction gains (losses) $ — $ — $ (350 ) Contingent considerations Derivative and foreign currency transaction gains (losses) — 170 (129 ) Contingent considerations General and administrative expenses — 10,322 2,048 Currency forward contracts Derivative and foreign currency transaction gains (losses) 2,556 (3,081 ) 3,699 $ 2,556 $ 7,411 $ 5,268 In January 2017, January 26, 2017 November 27, 2017 The foregoing forward and put options transactions have not There were no 1, 2 3 December 31, 2019. The fair value of the Company’s long-term debt approximates its fair value, except for the following: Fair Value Carrying Amount 2019 2018 2019 2018 (Dollars in millions) (Dollars in millions) Olkaria III Loan - OPIC $ 202.1 $ 211.8 $ 192.6 $ 210.6 Olkaria III plant 4 Loan - DEG 2 43.8 47.2 42.5 47.5 Olkaria III plant 1 Loan - DEG 3 38.8 — 37.1 — Platanares Loan - OPIC 115.3 119.1 104.5 112.7 Amatitlan Loan 26.4 29.9 26.3 29.8 Senior Secured Notes: OrCal Geothermal Inc. ("OrCal") — 19.0 — 18.7 OFC 2 LLC ("OFC 2") 210.9 214.5 203.0 217.8 Don A. Campbell 1 ("DAC 1") 78.5 78.8 78.2 83.3 USG Prudential - NV 30.6 29.4 28.4 27.8 USG Prudential - ID 18.6 18.6 19.6 18.9 USG DOE 45.0 48.3 40.8 51.4 Senior Unsecured Bonds 205.7 199.4 204.3 204.3 Senior Unsecured Loan 161.3 102.2 150.0 100.0 Plumstriker 21.7 — 21.6 — Other long-term debt 16.3 5.4 17.4 6.2 The fair value of the long-term debt is determined by a valuation model, which is based on a conventional discounted cash flow methodology and utilizes assumptions of current borrowing rates.The fair value of revolving lines of credit is determined using a comparison of market-based price sources that are reflective of similar credit ratings to those of the Company. The carrying value of other financial instruments, such as revolving lines of credit, commercial paper and deposits approximates fair value. The following table presents the fair value of financial instruments as of December 31, 2019: Level 1 Level 2 Level 3 Total (Dollars in millions) Olkaria III - OPIC $ — $ — $ 202.1 $ 202.1 Olkaria III plant 4 - DEG 2 — — 43.8 43.8 Olkaria III plant 1 - DEG 3 — — 38.8 38.8 Platanares Loan - OPIC — — 115.3 115.3 Amatitlan Loan — 26.4 — 26.4 Senior Secured Notes: OFC 2 Senior Secured Notes — — 210.9 210.9 DAC 1 Senior Secured Notes — — 78.5 78.5 USG Prudential - NV — — 30.6 30.6 USG Prudential - ID — — 18.6 18.6 USG DOE — — 45.0 45.0 Senior Unsecured Bonds — — 205.7 205.7 Senior Unsecured Loan — — 161.3 161.3 Plumstriker — 21.7 — 21.7 Other long-term debt — — 16.3 16.3 Commercial paper — 50.0 — 50.0 Revolving lines of credit — 40.6 — 40.6 Deposits 12.2 — — 12.2 The following table presents the fair value of financial instruments as of December 31, 2018: Level 1 Level 2 Level 3 Total (Dollars in millions) Olkaria III Loan - OPIC $ — $ — $ 211.8 $ 211.8 Olkaria III plant 4 - DEG 2 — — 47.2 47.2 Platanares Loan - OPIC — — 119.1 119.1 Amatitlan Loan — 29.9 — 29.9 Senior Secured Notes: OrCal Senior Secured Notes — — 19.0 19.0 OFC 2 Senior Secured Notes — — 214.5 214.5 DAC 1 Senior Secured Notes — — 78.8 78.8 USG Prudential - NV — — 29.4 29.4 USG Prudential - ID — — 18.6 18.6 USG DOE — — 48.3 48.3 Senior Unsecured Bonds — — 199.4 199.4 Senior Unsecured Loan — — 102.2 102.2 Other long-term debt — — 5.4 5.4 Revolving lines of credit — 159.0 — 159.0 Deposits 12.0 — — 12.0

Note 8 - Property, Plant and Eq

Note 8 - Property, Plant and Equipment and Construction-in-process	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Property, Plant and Equipment Disclosure [Text Block]	NOTE 8 Property, plant and equipment Property, plant and equipment, net, consist of the following: December 31, 2019 2018 (Dollars in thousands) Land owned by the Company where the geothermal resource is located $ 38,049 $ 38,060 Leasehold improvements 7,757 5,718 Machinery and equipment 230,465 208,646 Land, buildings and office equipment 39,099 35,708 Vehicles 8,021 22,074 Geothermal and recovered energy generation power plants, including geothermal wells and exploration and resource development costs: United States of America, net of cash grants 2,160,910 2,065,377 Foreign countries 721,824 710,775 Asset retirement cost 19,824 11,448 3,225,949 3,097,806 Less accumulated depreciation (1,254,534 ) (1,138,228 ) Property, plant and equipment, net $ 1,971,415 $ 1,959,578 Depreciation expense for the years ended December 31, 2019, 2018 2017 December 31, 2019, 2018, 2017 U.S. Operations The net book value of the property, plant and equipment, including construction-in-process, located in the United States was approximately $1,841.4 million and $1,696.4 million as of December 31, 2019 2018, December 31, 2019 2018 Foreign Operations The net book value of property, plant and equipment, including construction-in-process, located outside of the United States was approximately $506.6 million and $524.8 million as of December 31, 2019 2018, The Company, through its wholly owned subsidiary, OrPower 4, 4” December 31, 2019 2018, 2033 2036 The Company, through its wholly owned subsidiary, Orzunil I de Electricidad, Limitada (Orzunil), owns a power plant in Guatemala. On January 22, 2014, 2019 2034. December 31, 2019 2018, The Company, through its wholly owned subsidiary, Ortitlan, Limitada (“Ortitlan”), owns a power plant in Guatemala. The net book value of the assets related to the power plant was $42.8 million and $43.5 million at December 31, 2019 2018, The Company, through its wholly owned subsidiary, GeoPlatanares, signed a BOT contract for the Platanares geothermal project in Honduras with ELCOSA, a privately owned Honduran energy company, for 15 years from the commercial operation date, which expires in 2047. December 31, 2019 2018, The Company, through its subsidiary, GB, owns a power plant in Guadeloupe. The net book value of the assets related to the power plant was $24.5 million and $23.9 million at December 31, 2019 2018, Construction-in-process Construction-in-process consists of the following: December 31, 2019 2018 (Dollars in thousands) Projects under exploration and development: Up-front bonus costs $ 17,018 $ 17,018 Exploration and development costs 66,916 53,237 Interest capitalized 703 703 84,637 70,958 Projects under construction: Up-front bonus costs 27,473 27,473 Drilling and construction costs 258,484 160,398 Interest capitalized 5,961 2,861 291,918 190,732 Total $ 376,555 $ 261,690 Projects under exploration and development Up-front Bonus Costs Exploration and Development Costs Interest Capitalized Total (Dollars in thousands) Balance at December 31, 2016 $ 17,385 $ 36,359 $ 703 $ 54,447 Cost incurred during the year — 11,224 — 11,224 Write off of unsuccessful exploration costs (367 ) (1,429 ) — (1,796 ) Balance at December 31, 2017 17,018 46,154 703 63,875 Cost incurred during the year — 7,209 — 7,209 Write off of unsuccessful exploration costs — (126 ) — (126 ) Balance at December 31, 2018 17,018 53,237 703 70,958 Cost incurred during the year — 17,215 — 17,215 Transfer of projects under exploration and development to projects under construction — (3,536 ) — (3,536 ) Balance at December 31, 2019 $ 17,018 $ 66,916 $ 703 $ 84,637 Projects under construction Up-front Bonus Drilling and Construction Costs Interest Capitalized Total (Dollars in thousands) Balance at December 31, 2016 $ 37,713 $ 202,211 $ 12,338 $ 252,262 Cost incurred during the year — 231,926 7,300 239,226 Transfer of completed projects to property, plant and equipment (10,240 ) (235,194 ) (16,387 ) (261,821 ) Balance at December 31, 2017 27,473 198,943 3,251 229,667 Cost incurred during the year — 219,610 — 219,610 Cost write off — (1,380 ) — (1,380 ) Fair value of projects under construction acquired in a business combination — 4,668 — 4,668 Transfer of completed projects to property, plant and equipment — (261,443 ) (390 ) (261,833 ) Balance at December 31, 2018 27,473 160,398 2,861 190,732 Cost incurred during the year — 264,137 3,100 267,237 Transfer of projects under exploration and development to projects under construction — 3,536 — 3,536 Insurance recoveries — (35,435 ) — (35,435 ) Transfer of completed projects to property, plant and equipment — (134,152 ) — (134,152 ) Balance at December 31, 2019 $ 27,473 $ 258,484 $ 5,961 $ 291,918

Note 9 - Intangible Assets and

Note 9 - Intangible Assets and Goodwill	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Intangible Assets Disclosure [Text Block]	NOTE 9 Intangible assets amounting to $186.2 million and $199.9 million consist mainly of the Company’s PPAs acquired in business combinations and its storage activities, net of accumulated amortization of $74.1 million and $61.5 million as of December 31, 2019 2018, December 31, 2019 2018 December 31, 2019, 2018 2017 December 31, 2019, 2018 2017, 2018 2017 December 2019 2018 may not no 2019, 2018 2017. Estimated future amortization expense for the intangible assets as of December 31, 2019 (Dollars in thousands) Year ending December 31: 2020 $ 12,983 2021 12,983 2022 12,729 2023 12,610 2024 11,255 Thereafter 123,660 Total $ 186,220 Goodwill Goodwill amounting to $20.1 million and $20.0 million as of December 31, 2019 2018, During the fourth 2018, one 1 fourth 2018. December 31, 2018. 3 Except as noted above, for the years 2019, 2018 2017 no Changes in the carrying amount of the Company’s goodwill for the years ended December 31, 2019 2018 2019 2018 (Dollars in thousands) Goodwill as of January 1, $ 19,950 $ 21,037 Goodwill acquired — 12,710 Goodwill impairment charge — (13,464 ) Translation differences 190 (333 ) Goodwill as of December 31, $ 20,140 $ 19,950

Note 10 - Accounts Payable and

Note 10 - Accounts Payable and Accrued Expenses	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Accounts Payable and Accrued Liabilities Disclosure [Text Block]	NOTE 10 Accounts payable and accrued expenses consist of the following: December 31, 2019 2018 (Dollars in thousands) Trade payable $ 73,271 $ 56,299 Salaries and other payroll costs 24,364 20,188 Customer advances 2,092 918 Accrued interest 6,321 5,914 Income tax payable 11,344 8,436 Property tax payable 3,033 2,999 Scheduling and transmission 2,264 595 Royalty accrual 6,457 4,610 Deferred revenues — 2,300 Warranty accrual 3,245 4,552 Other 9,466 9,551 Total $ 141,857 $ 116,362

Note 11 - Long-term Debt, Credi

Note 11 - Long-term Debt, Credit Agreements and Commercial Paper	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Long-term Debt [Text Block]	NOTE 11 Long-term debt consists of notes payable under the following agreements: December 31, 2019 2018 (Dollars in thousands) Limited and non-recourse agreements: Loans: Non-recourse: Other loans $ 8,997 $ 6,241 Limited recourse: Loan agreement with OPIC (the Olkaria III power plant) 192,646 210,641 Loan agreement with OPIC (the Platanares power plant) 104,459 112,652 Loan agreement with Banco Industrial S.A. and Westrust Bank (International) Limited 26,250 29,750 Loan agreement with a global industrial company (the Plumstriker battery energy storage projects) 21,615 — Other loans 8,367 — Senior Secured Notes: Non-recourse: OrCal Senior Secured Notes — 18,652 DAC 1 Senior Secured Notes 78,247 83,319 Limited recourse: OFC 2 Senior Secured Notes 203,040 217,810 Other loans 88,840 96,482 Total limited and non-recourse agreements 732,461 775,547 Less current portion (58,932 ) (63,180 ) Non current portion $ 673,529 $ 712,367 Full recourse agreements: Senior Unsecured Bonds 204,332 204,332 Senior Unsecured Loan (Migdal) 150,000 100,000 Loan agreements with DEG (the Olkaria III and power plants 4 and 1 upgrade) 79,632 47,500 Revolving credit lines with banks 40,550 159,000 Total full recourse agreements 474,514 510,832 Less current portion (117,122 ) (164,000 ) Non current portion $ 357,392 $ 346,832 Loan Agreement with Banco Industrial S.A. and Westrust Bank (International) Limited On July 31, 2015, 20 The loan is payable in 48 September 30, 2015. per annum March 30, June 30, September 30 December 30 not may eighth There are various restrictive covenants under the Amatitlan credit agreement. These include, among other things, (i) a financial covenant to maintain a Debt Service Coverage Ratio (as defined in the credit agreement) of not 1.00 not 1.00 four December 31, 2019, The loan is collateralized by substantially all the assets of the borrower and a pledge of all of the membership interests of the borrower. The Company has guaranteed payment of all obligations under the credit agreement and related financing documents. The guaranty is limited in the sense that the Company is only required to pay the guaranteed obligations if a “trigger event” occurs. A trigger event is the occurrence and continuation of a default by INDE in its payment obligations under the PPA for the Amatitlàn power plant or a refusal by INDE to receive capacity and energy sold under that PPA. The Company’s obligations under the guaranty may As of December 31, 2019, Finance Agreement with OPIC (the Olkaria III Complex) On August 23, 2012, 4, November 9, 2012. The OPIC Loan is comprised of up to three • Tranche I in an aggregate principal amount of $85.0 million, which was drawn in November 2012, • Tranche II in an aggregate principal amount of $180.0 million was used to fund the construction and well field drilling for the expansion of the Olkaria III geothermal power complex (“Plant 2” November 2012, February 2013, • Tranche III in an aggregate principal amount of $45.0 million was used to fund the construction of Plant 3 November 2013, In July 2013, December 31, 2019 December 15, 2030, December 31, 2019 June 15, 2030, November 2013, December 31, 2019 December 15, 2030, OrPower 4 first two 2 third 2 not 1.7. The OPIC Loan is collateralized by substantially all of OrPower 4’s 4. The finance agreement includes customary events of default, including failure to pay any principal, interest or other amounts when due, failure to comply with covenants, breach of representations and warranties, non-payment or acceleration of other debt of OrPower 4, 4 4, There are various restrictive covenants under the OPIC Loan, which include a required historical and projected 12 not March 15, June 15, September 15 December 15 4 1.1, 4. December 15, 2014. December 31, 2019, As of December 31, 2019, Debt service reserve As required under the terms of the OPIC Loan, OrPower 4 may six December 31, 2019 2018, December 31, 2019, 22 Well drilling reserve As required under the terms of the OPIC Loan, OrPower 4 may may Finance Agreement with OPIC (the Platanares power plant) On April 30, 2018, 35 October 2018. Tranche I in an aggregate principal amount of $114.7 million was drawn in October 2018, September 2032. 2020 Under the Finance Agreement, Platanares may, first second third no fourth The OPIC Loan is also subject to customary mandatory prepayment upon the occurrence of certain events, including, among others, (i) receipt by Platanares of compensation or damages following a dispute that results in a material adverse change to the primary power purchase agreement for the Project, (ii) receipt by Platanares of a termination or indemnity payment from a third The OPIC Loan will be secured by a first no 1; not 1. December 31, 2019, The Finance Agreement also contains customary events of default, including, among others, failure to pay principal, interest or other amounts when due, non-payment or acceleration of other indebtedness of Platanares, the occurrence of a change of control of Platanares without the prior approval of OPIC, expropriation, judgments rendered against Platanares in excess of a certain threshold, failure to comply with covenants, a voluntary abandonment of the Project and the occurrence of certain bankruptcy events, subject to various exceptions and applicable notice, cure and grace periods. As of December 31, 2019, Debt service reserve As required under the terms of the Platanares Loan, Platanares maintains an account which may six nine December 31, 2019, 22 Well drilling reserve As required under the terms of the Finance Agreement, Platanares is required to maintain an account which may December 31, 2019, 22 OrCal Senior Secured Notes In December 2005, December 30, 2020. October 2019, OFC 2 In September 2011, 2, 2’s 2 2 2 2 December 31, 2034. Subject to the fulfillment of customary and other specified conditions precedent, the OFC 2 may six 2 2 2 not December 31, 2034. ten 2 1705 2005, 2 2 On October 31, 2011, 2 2032 March, June, September December On June 20, 2014, 1 On August 29, 2014, 2 2 second 1705 2005. December 2032, The OFC 2 2 2. 2 2 2. 2 Among other things, the distribution restrictions include a historical debt service coverage ratio requirement of at least 1.2 (on a blended basis for all OFC 2 two six 2 two six December 31, 2019, As of December 31, 2019, 2 The Company provided a guaranty in connection with the issuance of the Series A Notes and Series C Notes. The guaranty may 2 2 may 2 2 2 2 2 not Debt service reserve; other restricted funds Under the terms of the OFC 2 2 (i) A debt service reserve account which may 2 six December 31, 2019, 22 (ii) A performance level reserve account, intended to provide additional security for the OFC 2 may December 31, 2019, zero no (iii) Under the terms of the OFC 2 2 may (iv) A performance level reserve account for McGinness Hills Phase II, intended to provide additional security for the OFC 2 may December 31, 2019, no Don A. Campbell Senior Secured Notes — Non-Recourse On November 29, 2016, 47 47” 47 47 September 27, 2033 ( 1 1933, 47 first 1” The net proceeds from the sale of the DAC 1 47 1 ORNI 47 1 December 27, 2016 27th March, June, September December, 1 The DAC 1 47 47. 47 47 may 1 may 1 100% 47 47 1 101% not 1 may 47 1 100% 47 47 47 47 47 not four December 31, 2019, As of December 31, 2019, 1 Loans assumed with the acquisition of USG On April 24, 2018, Prudential Capital Group – Idaho non-recourse In May 2016, two $20.0 first seven seven December 31, 2019, U.S. Department of Energy – non-recourse On August 31, 2011, first February 23, 2011. No 13 first December 31, 2019, Prudential Capital Group – Nevada non-recourse On September 26, 2013, December 31, 2019, Senior Unsecured Bonds In September 2016, two 2 3 2 2 3 September 29, 2016 August 1, 2017. The Series 2 September 2020 3 September 2022 2 3 Senior Unsecured Loan On March 22, 2018 15 September 15, 2021, March 15, 2029. The Loan is subject to early redemption by the Company prior to maturity from time to time (but not no no 4.5, The Migdal Loan constitutes senior unsecured indebtedness of the Company and will rank equally in right of payment with any existing and future senior unsecured indebtedness of the Company, and effectively junior to any existing and future secured indebtedness, to the extent of the security therefore. The Migdal Loan Agreement includes various affirmative and negative covenants, including a covenant that the Company maintain (i) a debt to adjusted EBITDA ratio below 6, not not 25%. one not March 27, 2018 On March 25, 2019, first March 22, 2018. 15 September 15, 2021, March 15, 2029. Loan Agreements with DEG (the Olkaria III Complex) On October 20, 2016, 4 2 December 21, 2016, 4 2 2 20 December 21, 2018, June 21, 2028. 2 4 4 2 1 3 2 Under the DEG 2 4 may 2 may 2 100% 4 2 100% 2 4 2 As of December 31, 2019, 2 DEG 3 On January 4, 2019, 4 3 February 28, 2019, 4 3 3 19 June 21, 2019, June 21, 2028. 3 4 1 3 1 3 3 As of December 31, 2019, 3 Plumstriker Loan On May 4, 2019, two two 20 On May 30, 2019, three 29 14 June 30, 2019. May 30, 2026. not As of December 31, 2019, Société Géneralé Loan On April 9, 2019, April 29, 2019, 1.52%. 28 July 29, 2019. April 29, 2026. one As of December 31, 2019, Bpifrance Loan On April 4, 2019, April 29, 2019, 1.93%. 20 June 30, 2021. March 31, 2026. not As of December 31, 2019, Revolving credit lines with commercial banks As of December 31, 2019, eight one one March 2020 July 2022. As of December 31, 2019, Credit Agreements Credit agreement with Union Bank In February 2012, June 30, 2020. December 31, 2019, may, There are various restrictive covenants under the credit agreement, which include a requirement to comply with the following financial ratios, which are measured quarterly: (i) a 12 not 4.5; 12 not 1.35; not 2.0. December 31, 2019: ( 12 2.1; 12 2.87; 1.0. As of December 31, 2019, Credit agreement with HSBC In May 2013, one October 31, 2020. December 31, 2019, may may, There are various restrictive covenants under the credit agreement, including a requirement to comply with the following financial ratios, which are measured quarterly: (i) a 12 not 4.5; 12 not 1.35; not 2.0. December 31, 2019: ( 12 2.1; 12 2.87; 1.0. As of December 31, 2019, CHUBB Surety Bond In May 2017, may may no may twenty not December 31, 2019, Short-term commercial paper On June 27, 2019, July 3, 2019, 90 five three 90 As of December 31, 2019, Restrictive covenants The Company’s obligations under the credit agreements, the loan agreements, and the trust instrument governing the bonds, described above, are unsecured, but are subject to a negative pledge in favor of the banks and the other lenders and certain other restrictive covenants. These include, among other things, a prohibition on: (i) creating any floating charge or any permanent pledge, charge or lien over the Company's assets without obtaining the prior written approval of the lender; (ii) guaranteeing the liabilities of any third third no 12 not 6; not December 31, 2019: ( 12 2.99. December 31, 2019, Future minimum payments Future minimum payments under long-term debt as of December 31, 2019 (Dollars in thousands) Year ending December 31: 2020 $ 135,504 2021 76,259 2022 220,677 2023 98,982 2024 78,600 Thereafter 557,890 Total $ 1,167,912

Note 12 - Puna Power Plant Tran

Note 12 - Puna Power Plant Transactions	12 Months Ended
	Dec. 31, 2019
Projected [Member]
Notes to Financial Statements
Leases of Lessee Disclosure [Text Block]	NOTE 12 In 2005, In December 2019, 2052 46 no 227,000 227,000 December 31, 2019. In connection with the execution of the amended and restated PPA, the Company paid $20.5 million to effectively terminate the lease transactions involving the original power plant which gives the Company the ability to satisfy its obligations under the new PPA. The Company recorded this payment under deposits and other in its consolidated balance sheets as an incremental cost in obtaining the new amended and restated PPA as described above. As a result, the Company has no December 31, 2019. Prior to the amended and restated PPA, PGV leased the Puna Power Plant to an unrelated company under a 31-year head lease (the “Head Lease”) in return for prepaid lease payments in the total amount of $83.0 million (the “Deferred Lease Income”). The unrelated company (the “Lessor”) simultaneously leased back the Puna Power Plant to PGV under a 23-year lease (the “Project Lease”). PGV’s rent obligations under the Project Lease were paid solely from revenues generated by the Puna Power Plant under a PPA that PGV had with HELCO. The Head Lease and the Project Lease were non-recourse lease obligations to the Company. PGV’s rights in the geothermal resource and the related PPA were not The Head Lease and the Project Lease were accounted for separately. Each was classified as an operating lease in accordance with the accounting standards for leases. The Project Lease transaction was included in the initial recognition of operating leases right of use asset and liability on the consolidated balance sheets as of January 1, 2019 1 31 23 December 31, 2018

Note 13 - Tax Monetization Tran

Note 13 - Tax Monetization Transactions	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Disclosure Of Investments In And Advances To Affiliates [Text Block]	NOTE 13 McGinness Hills 3 On August 14, 2019, one 3 3 Pursuant to the transaction documents, prior to December 31, 2027 ( one 3 not On the Target Flip Date, the Company, through one Tungsten Mountain partnership transaction On May 17, 2018, one Under the transaction documents, prior to December 31, 2026 ( not On the Target Flip Date, Ormat Nevada has the option to purchase the private investor’s interests at the then-current fair market value, plus an amount that causes the private investor to reach its target return, if needed. If Ormat Nevada exercises this purchase option, it will become the sole owner of the project again. Opal Geo Transaction On December 16, 2016, December 16, 2016, five In connection with the transactions contemplated by the Equity Contribution Agreement and the LLC Agreement, Ormat Nevada transferred its indirect ownership interest in the McGinness Hills (Phase I and Phase II), Tuscarora, Jersey Valley and second 2” 2 Pursuant to the Equity Contribution Agreement, JPM contributed approximately $62.1 million to Opal Geo in exchange for 100% of the Class B Membership Interests of Opal Geo. JPM also agreed to make deferred capital contributions to Opal Geo based on the amount of electricity generated by the DAC 2 December 31, 2022. Under the LLC Agreement, until December 31, 2022, December 31, 2022 Under the LLC Agreement, all items of Opal Geo income and loss, gain, deduction and credit (including the federal production tax credits relating to the operation of the two two no two Under the LLC Agreement, OrLeaf, which owns 100% of the Class A Membership Interests in Opal Geo, will serve as the managing member of Opal Geo and control the day-to-day management of Opal Geo and its portfolio of five may five 2 five The LLC Agreement contains certain customary restrictions on transfer applicable to both OrLeaf and JPM with respect to their respective Membership Interests in Opal Geo, and also provides OrLeaf with a right of first may December 31, 2022 9 Pursuant to the Equity Contribution Agreement, the Company has provided a guaranty for the benefit of JPM of certain of OrLeaf’s indemnification obligations to JPM under the LLC Agreement. In addition, Ormat Nevada also provided a guaranty for the benefit of JPM of all present and future payment and performance obligations of OrLeaf under the LLC Agreement and each ancillary document to which OrLeaf is a party. JPM’s approximately $62.1 1. 2 Other completed tax monetization transactions On May 31, 2017, October 31, 2017, In March 2017, July 10, 2017,

Note 14 - Asset Retirement Obli

Note 14 - Asset Retirement Obligation	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Asset Retirement Obligation Disclosure [Text Block]	NOTE 14 The following table presents a reconciliation of the beginning and ending aggregate carrying amount of asset retirement obligation for the years presented below: Year Ended December 31, 2019 2018 (Dollars in thousands) Balance at beginning of year $ 39,475 $ 27,110 Revision in estimated cash flows (335 ) (258 ) Liabilities incurred and acquired 8,334 10,149 Accretion expense 2,709 2,474 Balance at end of year $ 50,183 $ 39,475

Note 15 - Stock-based Compensat

Note 15 - Stock-based Compensation	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Share-based Payment Arrangement [Text Block]	NOTE 15 The Company makes an estimate of expected forfeitures and recognizes compensation costs only for those stock-based awards expected to vest. As of December 31, 2019, During the years ended December 31, 2019, 2018 2017, Year Ended December 31, 2019 2018 2017 (Dollars in thousands) Cost of revenues $ 3,633 $ 3,488 $ 3,369 Selling and marketing expenses 4,810 792 452 General and administrative expenses 916 5,938 4,939 Total stock-based compensation expense 9,359 10,218 8,760 Tax effect on stock-based compensation expense 736 668 604 Net effect of stock-based compensation expense $ 8,623 $ 9,550 $ 8,156 During the fourth 2019, 2018 2017, Valuation assumptions The Company estimates the fair value of the stock-based awards using the Exercise Multiple-Based Lattice Model as it enables a degree of accounting for the complexities of option valuation and reduces the probability of a measurement error. The dividend yield forecast is expected to be 20% of the Company’s yearly net profit, which is equivalent to a 0.7% yearly weighted average dividend rate in the year ended December 31, 2019. The Company calculated the fair value of each stock-based award on the date of grant based on the following assumptions: Year Ended December 31, 2019 2018 2017 For stock based awards issued by the Company: Risk-free interest rates 1.8 % 2.8 % 1.9 % Expected lives (in weighted average years) 3.5 3.5 3.1 Dividend yield 0.7 % 0.9 % 0.62 % Expected volatility (weighted average) 25.1 % 25.5 % 27.2 % The Company estimated the forfeiture rate (on a weighted average basis) as follows: Year Ended December 31, 2019 2018 2017 Weighted average forfeiture rate 8.6 % 3.1 % — % Stock-based awards The 2012 In May 2012, 2012 2012 2012 2012 one first third fourth six ten 2012 2012 May 2018 2018 “2018 2012 The 2018 In May 2018, 2018 2018 2018 2018 2018 second third fourth 2018 first six ten 2018 On November 7, 2019, 2018 six first The fair value of each SAR and RSU for the directors on the grant date was $19.8 and $76.4, respectively. The Company calculated the fair value of each SAR on the grant date using the Exercise Multiple-Based Lattice Pricing model based on the following assumptions: Risk-free interest rate 1.79 % Expected life (in years) 3.5 Dividend yield 0.57 % Expected volatility 24.80 % Forfeiture rate for directors 0.0 % Sub-Optimal Exercise Factor for directors 2.8 Information on the awards outstanding and the related weighted average exercise price as of and for the years ended December 31, 2019, 2018 2017 Year Ended December 31, 2019 2018 2017 Awards (In thousands) Weighted Average Exercise Price Awards (In thousands) Weighted Average Exercise Price Awards (In thousands) Weighted Average Exercise Price Outstanding at beginning of year 2,527 $ 46.77 1,548 $ 41.35 2,565 $ 33.36 Granted, at fair value: Stock Options — — — — 30 57.97 SARs* 38 69.13 1,172 53.87 132 62.55 RSUs** 9 — 74 — 23 — Exercised (711 ) 37.83 (203 ) 29.75 (1,181 ) 25.92 Forfeited (71 ) 50.59 (64 ) 45.73 (21 ) 46.15 Expired — — — — — — Outstanding at end of year 1,792 50.39 2,527 46.77 1,548 41.35 Options and SARs exercisable at end of year 479 48.35 846 42.06 431 32.61 Weighted-average fair value of options and SARs granted during the year $ 29.24 $ 16.45 $ 22.82 * Upon exercise, SARs entitle the recipient to receive shares of common stock equal to the increase in value of the award between the grant date and the exercise date. ** An RSU represents the right to receive one As of December 31, 2019, 2018 2012 The following table summarizes information about stock-based awards outstanding at December 31, 2019 ( Awards Outstanding Awards Exercisable Exercise Price Number of Stock-based Awards Outstanding Weighted Average Remaining Contractual Life in Years Aggregate Intrinsic Value Number of Stock-based Awards Exercisable Weighted Average Remaining Contractual Life in Years Aggregate Intrinsic Value $ — 59 1.5 $ 4,369 — — $ — 42.87 427 2.5 13,517 230 2.5 7,295 47.46 15 3.9 406 15 3.9 406 51.71 8 5.0 182 — — — 53.16 35 4.9 756 15 4.9 329 53.44 783 4.5 16,498 — — — 55.16 296 3.9 5,724 131 3.9 2,527 57.97 30 4.6 497 30 4.6 497 58.79 12 2.5 187 6 2.5 94 63.35 98 3.9 1,094 52 3.9 581 71.71 4 5.6 11 — — — 72.14 15 5.7 36 — — — 76.43 10 5.9 — — — — 1,792 3.8 $ 43,277 479 3.2 $ 11,729 The following table summarizes information about stock-based awards outstanding at December 31, 2018 ( Awards Outstanding Awards Exercisable Exercise Price Number of Stock-based Awards Outstanding Weighted Average Remaining Contractual Life in Years Aggregate Intrinsic Value Number of Stock-based Awards Exercisable Weighted Average Remaining Contractual Life in Years Aggregate Intrinsic Value $ — 75 1.8 $ 3,933 — — $ — 20.13 29 0.3 924 29 0.3 924 23.34 99 0.4 2,897 99 0.4 2,897 35.15 15 4.1 257 15 4.1 257 38.24 15 3.8 211 15 3.8 211 42.87 942 3.5 8,879 521 3.5 4,918 47.46 38 4.9 182 38 4.9 182 53.16 35 5.9 — — — — 53.44 828 5.5 — — — — 55.16 296 4.9 — 66 4.9 — 57.97 30 5.6 — 30 5.6 — 58.79 16 3.5 — — — — 63.35 109 4.9 — 33 4.9 — 2,527 4.3 $ 17,283 846 3.3 $ 9,389 The aggregate intrinsic value in the above tables represents the total pretax intrinsic value, based on the Company’s stock price of $74.52 and $52.30 as of December 31, 2019 2018, December 31, 2019 2018 The total pretax intrinsic value of options exercised during the year ended December 31, 2019 2018 December 31, 2019 2018, December 31, 2019 2018 $75.14 $52.30,

Note 16 - Power Purchase Agreem

Note 16 - Power Purchase Agreements	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Leases of Lessor Disclosure [Text Block]	NOTE 16 Substantially all of the Company’s electricity revenues are recognized pursuant to PPAs in the United States and in various foreign countries, including Kenya, Guatemala, Guadeloupe and Honduras. These PPAs generally provide for the payment of energy payments or both energy and capacity payments through their respective terms which expire in varying periods from 2022 2047. not first first fourth 2019, one Pursuant to the terms of certain of the PPAs, the Company may not not may

Note 17 - Interest Expense, Net

Note 17 - Interest Expense, Net	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Interest Expense Disclosure [Text Block]	NOTE 17 The components of interest expense are as follows: Year Ended December 31, 2019 2018 2017 (Dollars in thousands) Interest related to sale of tax benefits $ 11,786 $ 11,284 $ 6,985 Interest expense 71,883 63,368 54,381 Less — amount capitalized (3,285 ) (3,728 ) (7,224 ) $ 80,384 $ 70,924 $ 54,142

Note 18 - Income Taxes

Note 18 - Income Taxes	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Income Tax Disclosure [Text Block]	NOTE 18 U.S. and foreign components of income from continuing operations, before income taxes and equity in income (losses) of investees consisted of: Year Ended December 31, 2019 2018 2017 (Dollars in thousands) U.S $ 14,187 $ 14,097 $ 13,680 Non-U.S. (foreign) 123,116 123,084 157,050 Total income from continuing operations, before income taxes and equity in losses $ 137,303 $ 137,181 $ 170,730 The components of the provision (benefit) for income taxes, net are as follows: Year Ended December 31, 2019 2018 2017 (Dollars in thousands) Current: Federal $ — $ 0 $ 43,935 State 172 381 43 Foreign 16,969 14,992 11,186 Total current income tax expense $ 17,141 $ 15,373 $ 55,164 Deferred: Federal (12,179 ) (6,886 ) (55,718 ) State 4,671 (2,595 ) (3,284 ) Foreign 35,980 28,841 25,502 Total deferred tax provision (benefit) 28,472 19,360 (33,500 ) Total Income tax provision $ 45,613 $ 34,733 $ 21,664 Reconciliation of the U.S. federal statutory tax rate to the Company’s effective income tax rate is as follows: Year Ended December 31, 2019 2018 2017 U.S. federal statutory tax rate 21.0 % 21.0 % 35.0 % Impact of federal tax reform 0.0 2.6 (12.4 ) Transition tax inclusion — (5.7 ) 42.1 Foreign tax credits (22.8 ) (4.2 ) (50.5 ) Withholding tax 10.4 5.9 34.1 Valuation allowance - U.S (3.7 ) (17.2 ) (22.6 ) State income tax, net of federal benefit 3.7 1.0 1.1 Uncertain tax positions 2.1 2.1 — Effect of foreign income tax, net 9.7 5.6 (10.7 ) Production tax credits (5.0 ) (3.1 ) (1.2 ) Subpart F income 0.5 0.5 1.7 Tax on global intangible low-tax income 16.9 18.6 — Intra-entity transfers of assets other than inventory 0.3 (2.1 ) — Other, net 0.1 0.3 (3.9 ) Effective tax rate 33.2 % 25.3 % 12.7 % The net deferred tax assets and liabilities consist of the following: December 31, 2019 2018 (Dollars in thousands) Deferred tax assets (liabilities): Net foreign deferred taxes, primarily depreciation $ (88,508 ) $ (57,202 ) Depreciation (21,958 ) (30,500 ) Intangible drilling costs (1,405 ) 7,370 Net operating loss carryforward - U.S. 45,307 65,020 Tax monetization transaction (30,964 ) (17,104 ) Right-of-use assets (3,715 ) — Lease liabilities 3,755 — State and Investment tax credits 813 813 Production tax credits 100,524 90,913 Foreign tax credits 92,497 58,072 Withholding tax (15,539 ) (8,052 ) Stock options amortization 1,409 1,440 Basis difference in partnership interest (39,622 ) (36,516 ) Excess business interest 6,189 — Accrued liabilities and other 1,013 624 49,796 74,878 Less - valuation allowance (17,412 ) (22,441 ) Total $ 32,384 $ 52,437 The following table presents a reconciliation of the beginning and ending valuation allowance: 2019 2018 2017 (Dollars in thousands) Balance at beginning of the year $ 22,441 $ 77,571 $ 116,234 Additions to valuation allowance 15,437 4,747 46,560 Release of valuation allowance (20,466 ) (59,877 ) (85,223 ) Balance at end of the year $ 17,412 $ 22,441 $ 77,571 At December 31, 2019, 2018 2032 2037. 2017 At December 31, 2019, 2022 2039. December 31, 2019, 2022. At December 31, 2019, 2025 2039 December 31, 2019, The Company has recorded deferred tax assets for net operating losses, foreign tax credits, and production tax credits. Realization of the deferred tax assets and tax credits is dependent on generating sufficient taxable income in appropriate jurisdictions prior to expiration of the NOL carryforwards and tax credits. Based upon available evidence of the Company’s ability to generate additional taxable income in the future and historical losses in prior years, a valuation allowance in the amount of $17.4 million and $22.4 million is recorded against the U.S. deferred tax assets as of December 31, 2019 2018, not not December 31, 2018, $17.4 On April 24, 2018, 382, not not On December 22, 2017, not 1 2 3 one December 31, 2017; ( 4 5 6 December 31, 2017. The FASB released guidance Staff Q&A, Topic 740, No. 5, The following table presents the deferred taxes on the balance sheet as of the dates indicated: Year Ended December 31, 2019 2018 2017 (Dollars in thousands) Non-current deferred tax assets $ 129,510 $ 113,760 $ 57,337 Non-current deferred tax liabilities (97,126 ) (61,323 ) (61,961 ) Non-current deferred tax assets, net 32,384 52,437 (4,624 ) Uncertain tax benefit offset (1) (95 ) (95 ) (95 ) $ 32,289 $ 52,342 $ (4,719 ) ( 1 2013 11, At December 31, 2019, no 2019, At December 31, 2018, not During 2017, December 2017 December 2018. 2018 2017 15% Uncertain tax positions The Company is subject to income taxes in the United States (federal and state) and numerous foreign jurisdictions. Significant judgment is required in evaluating the Company's tax positions and determining its provision for income taxes. During the ordinary course of business, there are many transactions and calculations for which the ultimate tax determination is uncertain. The Company establishes reserves for tax-related uncertainties based on estimates of whether, and the extent to which additional taxes will be due. These reserves are established when the Company believes that certain positions might be challenged despite evidence supporting the position. The Company adjusts these reserves in light of changing facts and circumstances, such as the outcome of tax audits. The provision for income taxes includes the impact of reserve positions and changes to reserves that are considered probable. At December 31, 2019 2018, A reconciliation of the Company's unrecognized tax benefits is as follows: Year Ended December 31, 2019 2018 2017 (Dollars in thousands) Balance at beginning of year $ 8,820 $ 6,357 $ 4,609 Additions based on tax positions taken in prior years 104 293 5 Additions based on tax positions taken in the current year 2,314 2,446 2,580 Reduction based on tax positions taken in prior years (615 ) (276 ) (837 ) Balance at end of year $ 10,623 $ 8,820 $ 6,357 The Company and its U.S. subsidiaries file consolidated income tax returns for federal and state (where applicable) purposes. As of December 31, 2019, not The Company remains open to examination by the Internal Revenue Service for the years 2002 2019 2004 2019. may The Company’s foreign subsidiaries remain open to examination by the local income tax authorities in the following countries for the years indicated: Israel 2015 - 2019 Kenya 2013 - 2019 Guatemala 2015 - 2019 Honduras 2015 - 2019 Guadeloupe 2017 - 2019 New Zealand 2012 - 2019 Management believes that the liability for unrecognized tax benefits is adequate for all open tax years based on its assessment of many factors, including among others, past experience and interpretations of local income tax regulations. This assessment relies on estimates and assumptions and may not twelve Tax benefits in the United States The U.S. government encourages production of electricity from geothermal resources through certain tax subsidies. On February 9, 2018 2018 2018. December 20, 2019, 2021 first 10 may 1 20 If the Company claims the ITC, the Company’s “tax base” in the plant that it can recover through bonus or accelerated depreciation (if elected) must be reduced by half of the ITC. If the Company claims the PTC, there is no September 27, 2017, first ● 80% for property placed in service after Dec. 31, 2022 Jan. 1, 2024. ● 60% for property placed in service after Dec. 31, 2023 Jan. 1, 2025. ● 40% for property placed in service after Dec. 31, 2024 Jan. 1, 2026. ● 20% for property placed in service after Dec. 31, 2025 Jan. 1, 2027. The Company could also elect in lieu of bonus deprecation to depreciate most of its "tax base" in the plant for tax purposes over five may first Income taxes related to foreign operations Guatemala ten August 2017. August 2017, Israel 2017 2018 1959 two January 2011, 2014 2011. 2004 2008. may may Kenya September 11, 2015, 2015. 17B 15 4 15 5 January 1, 2016 January 1, 2015 15 4 15 5 Tax audit in Kenya The Company received three 2013 2017 The first March 2019, June 2019 two 2014 2017. July 2019, one two The Company received the second July 2019, 2013 2017. August 2019, December 2019, 2013 2017 January 2020, 2013 2017 The Company received the third December 2019 not January 2020, The Company is currently at different stages of discussions with the KRA on the matters included in the KRA letters of assessment and preliminary findings as described above and believes its tax positions for the issues raised during the audit period is more-likely-than- not December 31, 2019, not first Guadeloupe 2017, 2018, 2019, 2020, 2021 2022. Honduras first ten

Note 19 - Business Segments

Note 19 - Business Segments	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Segment Reporting Disclosure [Text Block]	NOTE 19 In 2018, 280, 2019, two 2018 2018 Transfer prices between the operating segments were determined on current market values or cost plus markup of the seller’s business segment. Summarized financial information concerning the Company’s reportable segments is shown in the following tables, including, as further described under Note 1 606: Electricity Product ESMS Consolidated (Dollars in thousands) Year Ended December 31, 2019: Revenues from external customers: United States (1) $ 333,797 $ 30,562 $ 13,597 $ 377,956 Foreign (2) 206,536 160,447 1,105 368,088 Net revenues from external customers 540,333 191,009 14,702 746,044 Intersegment revenues — 84,614 — 84,614 Depreciation and amortization expense 138,426 5,308 5,027 148,761 Operating income (loss) 177,192 23,180 (6,576 ) 193,796 Segment assets at period end (3) (*) 3,044,909 126,018 79,567 3,250,494 Expenditures for long-lived assets 259,898 9,156 10,932 279,986 * Including unconsolidated investments 81,140 — — 81,140 Year Ended December 31, 2018: Revenues from external customers: United States (1) 305,962 14,999 7,645 328,606 Foreign (2) 203,917 186,744 — 390,661 Net revenues from external customers $ 509,879 $ 201,743 $ 7,645 $ 719,267 Intersegment revenues — 48,817 — 48,817 Depreciation and amortization expense 126,181 4,311 1,741 132,233 Operating income (loss) 155,546 38,083 (8,519 ) 185,110 Segment assets at period end (3) (*) 2,896,938 156,942 67,470 3,121,350 Expenditures for long-lived assets 219,803 9,993 28,725 258,521 * Including unconsolidated investments 71,983 — — 71,983 Year Ended December 31, 2017: Revenues from external customers $ 465,593 $ 224,483 $ 2,736 $ 692,812 Intersegment revenues — 109,040 — 109,040 Depreciation and amortization expense 109,928 3,470 1,748 115,146 Operating income (loss) 157,613 50,543 (3,138 ) 205,018 Segment assets at period end (3) (*) 2,457,514 115,713 50,637 2,623,864 Expenditures for long-lived assets 252,581 6,653 — 259,234 * Including unconsolidated investments 34,084 — — 34,084 ( 1 Electricity segment revenues in the United States are all accounted under lease accounting, except for $61.3 million and $26.9 million for the years December 31, 2019 2018 606 2018. 606, 1 ( 2 Electricity segment revenues in foreign countries are all accounted under lease accounting. Product and Energy Storage and Management Services segment revenues in foreign countries are accounted under ASC 606 1 ( 3 Electricity segment assets include goodwill in the amount of $20.1 million, $20.0 million and $7.6 as of December 31, 2019, 2018 2017, No December 31, 2019 2018. December 31, 2017 9 Reconciling information between reportable segments and the Company’s consolidated totals is shown in the following table: Year Ended December 31, 2019 2018 2017 (Dollars in thousands) Revenues: Total segment revenues $ 746,044 $ 719,267 $ 692,812 Intersegment revenues 84,614 48,817 109,040 Elimination of intersegment revenues (84,614 ) (48,817 ) (109,040 ) Total consolidated revenues $ 746,044 $ 719,267 $ 692,812 Operating income: Operating income $ 193,796 $ 185,110 $ 205,018 Interest income 1,515 974 988 Interest expense, net (80,384 ) (70,924 ) (54,142 ) Derivatives and foreign currency transaction gains (losses) 624 (4,761 ) 2,654 Income attributable to sale of tax benefits 20,872 19,003 17,878 Other non-operating income (expense), net 880 7,779 (1,666 ) Total consolidated income before income taxes and equity in earnings of investees $ 137,303 $ 137,181 $ 170,730 The Company sells electricity, products and energy storage and other related services mainly to the geographical areas set forth below based on the location of the customer. The following tables present certain data by geographic area: Year Ended December 31, 2019 2018 2017 (Dollars in thousands) Revenues from external customers attributable to: (1) United States $ 377,956 $ 328,606 $ 301,132 Indonesia — 4,379 28,968 Kenya 121,661 119,094 110,243 Turkey 88,938 168,699 125,166 Chile 25,540 980 8,895 Guatemala 28,624 27,975 27,991 New Zealand 31,222 10,451 33,395 Honduras 34,446 34,355 10,151 Other foreign countries 37,657 24,728 46,871 Consolidated total $ 746,044 $ 719,267 $ 692,812 ( 1 Year Ended December 31, 2019 2018 2017 (Dollars in thousands) Long-lived assets (primarily power plants and related assets) located in: United States $ 1,870,335 $ 1,696,439 $ 1,510,986 Kenya 284,526 301,956 340,970 Other foreign countries 224,676 222,872 281,333 Consolidated total $ 2,379,537 $ 2,221,267 $ 2,133,289 The following table presents revenues from major customers: Year Ended December 31, 2019 2018 2017 Revenues % Revenues % Revenues % (Dollars in thousands) (Dollars in thousands) (Dollars in thousands) Southern California Public Power (1) $ 133,725 17.9 $ 109,208 15.2 $ 70,100 10.1 Sierra Pacific Power Company and Nevada Power Company (1)(2) 125,486 16.8 116,149 16.1 125,424 18.1 KPLC (1) 121,661 16.3 119,094 16.6 110,243 15.9 ( 1 ( 2

Note 20 - Transactions With Rel

Note 20 - Transactions With Related Entities	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Related Party Transactions Disclosure [Text Block]	NOTE 20 There were no

Note 21 - Employee Benefit Plan

Note 21 - Employee Benefit Plan	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Pension and Other Postretirement Benefits Disclosure [Text Block]	NOTE 21 401 The Company has a 401 60 2019, 2018 2017, one December 31, 2019, 2018 2017, Severance plan The Company, through Ormat Systems, provides limited non-pension benefits to all current employees in Israel who are entitled to benefits in the event of termination or retirement in accordance with the Israeli Government sponsored programs. These plans generally obligate the Company to pay one no December 31, 2019 2018, not may not December 31, 2019, 2018 2017 The Company expects to pay the following future benefits to its employees upon their reaching normal retirement age: (Dollars in thousands) Year ending December 31: 2020 $ 4,780 2021 1,434 2022 1,768 2023 89 2024 500 2025-2043 11,232 Total $ 19,803 The above amounts were determined based on the employees’ current salary rates and the number of years’ service that will have been accumulated at their retirement date. These amounts do not

Note 22 - Commitments and Conti

Note 22 - Commitments and Contingencies	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Commitments and Contingencies Disclosure [Text Block]	NOTE 22 Geothermal resources The Company, through its project subsidiaries in the United States, controls certain rights to geothermal fluids through certain leases with the BLM or through private leases. Royalties on the utilization of the geothermal resources are computed and paid to the lessors as defined in the respective agreements. Royalty expense under the geothermal resource agreements were $21.7 million, $21.6 million and $19.4 million for the years ended December 31, 2019, 2018 2017, Letters of credit In the ordinary course of business with customers, vendors, and lenders, the Company is contingently liable for performance under letters of credit totaling $213.8 million at December 31, 2019. not not Purchase commitments The Company purchases raw materials for inventories, construction-in-process and services from a variety of vendors. During the normal course of business, in order to manage manufacturing lead times and help assure adequate supply, the Company enters into agreements with contract manufacturers and suppliers that either allow them to procure goods and services based upon specifications defined by the Company, or that establish parameters defining the Company’s requirements. At December 31, 2019, 2019. Grants and royalties The Company, through Ormat Systems, had historically, through December 31, 2003, No December 31, 2019, 2018 2017. not not December 31, 2019 2018, Lease commitments The Company's lease commitments are detailed under Note 23, Contingencies ● On May 21, 2018, 11 August 3, 2017 May 13, 2018". 31 1 38C 1 2017 2 May 16, 2018, May 11, 2018 2017 ● On June 11, 2018, August 8, 2017 May 15, 2018 May 13, 2019. 10 10b 5 20 10 December 31, 2016 2017, 10 nine September 30, 2017 December 6, 2019 ● On September 11, 2018, October 22, 2018, four 14 2018 January 24, 2019, ● Following the announcement of the Company’s acquisition of USG, a number of putative shareholder class action complaints were initially filed on behalf of USG shareholders between March 8, 2018 March 30, 2018 No. 2018 0177 Mar. 12, 2018). May 24, 2018 ● On August 5, 2016, April 4, 2019, ● On March 29, 2016, 27th 11th In addition, from time to time, the Company is named as a party to various other lawsuits, claims and other legal and regulatory proceedings that arise in the ordinary course of the Company’s business. These actions typically seek, among other things, compensation for alleged personal injury, breach of contract, property damage, punitive damages, civil penalties or other losses, or injunctive or declaratory relief. With respect to such lawsuits, claims and proceedings, the Company accrues reserves when a loss is probable and the amount of such loss can be reasonably estimated. It is the opinion of the Company’s management that the outcome of these proceedings, individually and collectively, will not

Note 23 - Leases

Note 23 - Leases	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Leases of Lessee and Lessor Disclosure [Text Block]	NOTE 23 The Company is a lessee in operating lease transactions primarily consisting of land leases for its exploration and development activities. Additionally, the Company was a lessee under an operating lease in relation to the Puna power plant transaction which was terminated in December 2019 12 1 A. Leases in which the Company is a lessee The table below presents the effects on the amounts relating to total lease cost: Year Ended December 31, 2019 (Dollars in thousands) Lease cost Finance lease cost: Amortization of right-of-use assets $ 3,273 Interest on lease liabilities 1,330 Operating lease cost 8,057 Variable lease cost 1,647 Short-term lease cost — Total lease cost $ 14,307 Other information Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows for finance leases $ 1,330 Operating cash flows for operating leases 9,004 Financing cash flows for finance leases 3,164 Right-of-use assets obtained in exchange for new finance lease liabilities 5,262 Right-of-use assets obtained in exchange for new operating lease liabilities 6,364 December 31, Additional information as of December 31, 2019: 2019 Weighted-average remaining lease term — finance leases (in years) 4.0 Weighted-average remaining lease term — operating leases (in years) 7.3 Weighted-average discount rate (in percentage) 5 % Future minimum lease payments under non-cancellable leases as of December 31, 2019 Operating Leases Finance Leases (Dollars in thousands) Year ending December 31, 2020 $ 2,742 $ 4,251 2021 2,701 3,948 2022 2,079 3,873 2023 1,524 2,758 2024 1,275 906 Thereafter 10,635 4,118 Total future minimum lease payments 20,956 19,854 Less imputed interest 4,205 5,577 Total $ 16,751 $ 14,277 Future minimum lease payments under non-cancellable leases as of December 31, 2018, 840, (Dollars in thousands) Year ending December 31, 2019 $ 10,889 2020 7,515 2021 5,758 2022 4,415 2023 2,910 Thereafter 9,292 Total $ 40,779 B. Leases in which the Company is a lessor The table below presents the lease income recognized for lessors: Year Ended December 31, 2019 (Dollars in thousands) Lease income relating to lease payments of operating leases $ 479,059 Lease income relating to variable lease payments not included in the measurement of the lease — Total $ 479,059

Note 24 - Quarterly Financial I

Note 24 - Quarterly Financial Information (Unaudited)	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Quarterly Financial Information [Text Block]	NOTE 24 Three Months Ended Mar. 31, 2018 June 30, 2018 Sept. 30, 2018 Dec. 31, 2018 Mar. 31, 2019 June 30, 2019 Sept. 30, 2019 Dec. 31, 2019 (Dollars in thousands, except per share amounts) Revenues: Electricity $ 132,489 $ 122,179 $ 116,891 $ 138,320 $ 142,908 $ 129,079 $ 123,978 $ 144,368 Product 48,672 54,915 48,439 49,717 52,128 52,030 43,037 43,814 Energy storage and management services 2,862 1,205 1,150 2,428 4,002 2,956 3,484 4,260 Total revenues 184,023 178,299 166,480 190,465 199,038 184,065 170,499 192,442 Cost of revenues: Electricity 73,482 81,236 79,845 63,692 77,543 73,775 80,124 81,393 Product 33,726 37,573 35,669 33,729 42,106 41,316 31,073 31,479 Energy storage and management services 3,443 2,028 2,174 2,235 5,210 3,827 3,807 5,068 Total cost of revenues 110,651 120,837 117,688 99,656 124,859 118,918 115,004 117,940 Gross profit 73,372 57,462 48,792 90,809 74,179 65,147 55,495 74,502 Operating expenses: Research and development expenses 1,108 1,251 706 1,118 900 810 1,062 1,875 Selling and marketing expenses 3,699 3,712 8,578 3,813 3,865 3,276 3,783 4,123 General and administrative expenses 13,849 15,866 13,606 4,429 15,689 14,181 11,931 14,032 Impairment charge — — — 13,464 — — — — Write-off of unsuccessful exploration activities 123 — — 3 — — — — Operating income 54,593 36,633 25,902 67,982 53,725 46,880 38,719 54,472 Other income (expense): Interest income 113 189 214 458 293 420 482 320 Interest expense, net (14,344 ) (15,846 ) (18,700 ) (22,034 ) (21,223 ) (21,517 ) (20,076 ) (17,568 ) Derivatives and foreign currency transaction gains (losses) (1,599 ) (529 ) (383 ) (2,250 ) 472 19 205 (72 ) Income attributable to sale of tax benefits 7,361 3,556 4,066 4,020 7,764 4,637 4,056 4,415 Other non-operating income (expense), net (20 ) 7,373 309 117 91 1,027 244 (482 ) Income from operations before income tax and equity in earnings (losses) of investees 46,104 31,376 11,408 48,293 41,122 31,466 23,630 41,085 Income tax (provision) 26,942 (29,105 ) (1,184 ) (31,386 ) (14,039 ) 3,529 (9,626 ) (25,477 ) Equity in earnings (losses) of investees, net 1,210 388 (117 ) 6,182 1,047 1,202 1,085 (1,481 ) Net income 74,256 2,659 10,107 23,089 28,130 36,197 15,089 14,127 Net loss (income) attributable to noncontrolling interest (4,748 ) (3,002 ) 474 (4,869 ) (2,184 ) (2,259 ) 516 (1,521 ) Net income (loss) attributable to the Company's stockholders $ 69,508 $ (343 ) $ 10,581 $ 18,220 $ 25,946 $ 33,938 $ 15,605 $ 12,606 Earnings (loss) per share attributable to the Company's stockholders Basic: Net income $ 1.37 $ (0.01 ) $ 0.21 $ 0.36 $ 0.51 $ 0.67 $ 0.31 $ 0.25 Diluted: Net income $ 1.36 $ (0.01 ) $ 0.21 $ 0.36 $ 0.51 $ 0.66 $ 0.30 $ 0.24 Weighted average number of shares used in computation of earnings per share attributable to the Company's stockholders: Basic 50,614 50,623 50,645 50,691 50,709 50,800 50,933 51,017 Diluted 51,051 50,958 50,963 50,936 51,012 51,094 51,334 51,511

Note 25 - Subsequent Events

Note 25 - Subsequent Events	12 Months Ended
	Dec. 31, 2019
Notes to Financial Statements
Subsequent Events [Text Block]	NOTE 25 Cash dividend On February 25, 2020, March 12, 2020, March 26, 2020. Energy storage assets portfolio purchase transaction On February 28, 2020, third one one second 2020, 2020

Significant Accounting Policies

Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2019
Accounting Policies [Abstract]
Description Of Business [Policy Text Block]	Business The Company is primarily engaged in the geothermal and recovered energy business, including the supply of equipment that is manufactured by the Company and the design and construction of power plants for projects owned by the Company or for third Most of the Company’s domestic power plant facilities are Qualifying Facilities under the PURPA. The Power Purchase Agreements ("PPAs") for certain of such facilities are dependent upon their maintaining Qualifying Facility status. Management believes that all of the facilities located in the United States were in compliance with Qualifying Facility status requirements as of December 31, 2019.
Dividend Declared [Policy Text Block]	Cash dividends During the years ended December 31, 2019, 2018 2017,
Rounding [Policy Text Block]	Rounding Dollar amounts, except per share data, in the notes to these financial statements are rounded to the closest $1,000,
Basis of Accounting, Policy [Policy Text Block]	Basis of presentation The consolidated financial statements are prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) and include the accounts of the Company and of all majority-owned subsidiaries in which the Company exercises control over operating and financial policies, and variable interest entities in which the Company has an interest and is the primary beneficiary. Intercompany accounts and transactions have been eliminated in consolidation. Investments in less-than-majority-owned entities or other entities in which the Company exercises significant influence over operating and financial policies are accounted for using the equity method of accounting or consolidated if they are a variable interest entity in which the Company has an interest and is the primary beneficiary. Under the equity method, original investments are recorded at cost and adjusted by the Company’s share of undistributed earnings or losses of such companies. The Company’s earnings or losses in investments accounted for under the equity method have been reflected as “equity in earnings (losses) of investees, net” on the Company’s consolidated statements of operations and comprehensive income (loss).
Cash and Cash Equivalents, Policy [Policy Text Block]	Cash and cash equivalents The Company considers all highly liquid instruments, with an original maturity of three
Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block]	Restricted cash, cash equivalents, and marketable securities Under the terms of certain long-term debt agreements, the Company is required to maintain certain debt service reserves, cash collateral and operating fund accounts that have been classified as restricted cash and cash equivalents. Funds that will be used to satisfy obligations due during the next 12
Reconciliation of Cash and Cash Equivalents and Restricted Cash [Policy Text Block]	Reconciliation of cash and cash equivalents and restricted cash and cash equivalents The following table provides a reconciliation of cash and cash equivalents and restricted cash and cash equivalents reported on the balance sheet that sum to the total of the same amounts shown on the statement of cash flows: December 31, 2019 2018 2017 (Dollars in thousands) Cash and cash equivalents $ 71,173 $ 98,802 $ 47,818 Restricted cash and cash equivalents 81,937 78,693 48,825 Total cash and cash equivalents and restricted cash and cash equivalents $ 153,110 $ 177,495 $ 96,643
Concentration Risk, Credit Risk, Policy [Policy Text Block]	Concentration of credit risk Financial instruments which potentially subject the Company to concentration of credit risk consist principally of temporary cash investments and accounts receivable. The Company places its temporary cash investments with high credit quality financial institutions located in the U.S. and in foreign countries. At December 31, 2019 2018, ten $250,000 December 31, 2019 2018, not At December 31, 2019 2018, December 31, 2019 2018, 19 The Company has historically been able to collect substantially all of its receivable balances. As of December 31, 2019, January February 2020. September 30, 2019. May 2019, December 31, 2019, October 2018 April 2019 none Additionally, Pacific Gas and Electric Corporation (“PG&E Corporation”) and its subsidiary Pacific Gas and Electric Company (“PG&E”), which accounted for 1.5%, 1.9% and 2.0% of the Company's total revenues for the years ended December 31, 2019, 2018 2017, 2017 2018. January 29, 2019, 11 December 31, 2019, December 2019 January 2020.
Inventory, Policy [Policy Text Block]	Inventories Inventories consist primarily of raw material parts and sub-assemblies for power units and are stated at the lower of cost or net realizable value, using the weighted-average cost method. Inventories are reduced by a provision for slow-moving and obsolete inventories. This provision was not December 31, 2019 2018.
Deposit Contracts, Policy [Policy Text Block]	Deposits and other Deposits and other consist primarily of performance bonds for construction projects, long-term insurance contract and receivables, certain deferred costs and derivative instruments.
Property, Plant and Equipment, Impairment [Policy Text Block]	Property, plant and equipment, net Property, plant and equipment are stated at cost. All costs associated with the acquisition, development and construction of power plants operated by the Company are capitalized. Major improvements are capitalized and repairs and maintenance (including major maintenance) costs are expensed. Power plants operated by the Company, which include geothermal wells and exploration and resource development costs, are depreciated using the straight-line method over their estimated useful lives, which range from 15 to 30 years. The other assets are depreciated using the straight-line method over the following estimated useful lives of the assets: Buildings (in years) 25 Leasehold improvements (in years) 15 - 20 Machinery and equipment — manufacturing and drilling (in years) 10 Machinery and equipment — computers (in years) 3 - 5 Office equipment — furniture and fixtures (in years) 5 - 15 Office equipment — other (in years) 5 - 10 Vehicles (in years) 5 - 7 The cost and accumulated depreciation of items sold or retired are removed from the accounts. Any resulting gain or loss is recognized currently and recorded in the accompanying statements of operations. The Company capitalizes interest costs as part of constructing power plant facilities. Such capitalized interest is recorded as part of the asset to which it relates and is amortized over the asset’s estimated useful life. Capitalized interest costs amounted to $3.3 million, $3.7 million, and $7.2 million for the years ended December 31, 2019, 2018 2017,
Exploratory Drilling Costs Capitalization and Impairment, Policy [Policy Text Block]	Exploration and development costs The Company capitalizes costs incurred in connection with the exploration and development of geothermal resources once it acquires land rights to the potential geothermal resource. Prior to acquiring land rights, the Company makes an initial assessment that an economically feasible geothermal reservoir is probable on that land. The Company determines the economic feasibility of potential geothermal resources internally, with all available data and external assessments vetted through the exploration department and occasionally using outside service providers. Costs associated with the initial assessment are expensed and included in cost of electricity revenues in the consolidated statements of operations and comprehensive income (loss). Such costs were immaterial during the years ended December 31, 2019, 2018 2017. two three may In most cases, the Company obtains the right to conduct the geothermal development and operations on land owned by the Bureau of Land Management ("BLM"), various states or with private parties. The up-front bonus payments and other related costs, such as legal fees, are capitalized and included in construction-in-process. The annual land lease payments made during the exploration, development and construction phase are expensed as incurred and included in “electricity cost of revenues” in the consolidated statements of operations and comprehensive income (loss). Upon commencement of power generation on the leased land, the Company begins to pay the lessor’s long-term royalty payments based on the utilization of the geothermal resources as defined in the respective agreements. Such payments are expensed when the related revenues are earned and included in “electricity cost of revenues” in the consolidated statements of operations and comprehensive income (loss). Following the acquisition of land rights to the potential geothermal resource, the Company conducts further studies and surveys, including water and soil analyses, among others, and augments its database with the results of these studies. The Company then initiates a suite of geophysical surveys to assess the resource and determine drilling locations. If the results of these activities support the initial assessment of the feasibility of the geothermal resource, the Company then proceeds to exploratory drilling and other related activities which may may not When deciding whether to continue holding lease rights and/or to pursue exploration activity, the Company diligently prioritizes prospective investments, taking into account resource and probability assessments in order to make informed decisions about whether a particular project will support commercial operation. As a result, write-off of unsuccessful activities for the years ended December 31, 2019, 2018 2017 2017, no Grants received from the U.S. DOE are offset against the related exploration and development costs. There were no December 31, 2019, 2018 2017. All exploration and development costs that are being capitalized, including the up-front bonus payments made to secure land leases, will be depreciated over their estimated useful lives when the related geothermal power plant is substantially complete and ready for use. A geothermal power plant is substantially complete and ready for use when electricity generation commences.
Asset Retirement Obligation [Policy Text Block]	Asset retirement obligation The Company records the fair value of a legal liability for an asset retirement obligation in the period in which it is incurred. The Company’s legal liabilities include plugging wells and post-closure costs of power producing sites. When a new liability for asset retirement obligations is recorded, the Company capitalizes the costs of the liability by increasing the carrying amount of the related long-lived asset. The liability is accreted to its present value each period, and the capitalized cost is depreciated over the useful life of the related asset. The Company periodically reassess the assumptions used to estimate the expected cash flows required to settle the asset retirement obligation, including changes in estimated probabilities, amounts, and timing of the settlement of the asset retirement obligation, as well as changes in the legal requirements of an obligation and revises the previously recorded asset retirement obligation accordingly. At retirement, the obligation is settled for its recorded amount at a gain or loss.
Deferred Financing And Lease Transaction Costs [Policy Text Block]	Deferred financing costs Deferred financing costs are presented as a direct deduction from the carrying value of the associated debt liability or under deferred financing if associated with lines of credit. Such deferred costs are amortized over the term of the related obligation using the effective interest method or ratably, as applicable. Amortization of deferred financing costs is presented as interest expense in the consolidated statements of operations and comprehensive income (loss). Accumulated amortization related to deferred financing costs amounted to $19.5 million and $21.8 million at December 31, 2019 2018, December 31, 2019, 2018 2017 December 31, 2019, 2018 2017,
Goodwill and Intangible Assets, Goodwill, Policy [Policy Text Block]	Goodwill Goodwill represents the excess of the fair value of consideration transferred in the business combination transactions of Guadeloupe and USG over the fair value of tangible and intangible assets acquired, net of the fair value of liabilities assumed and the fair value of any noncontrolling interest in the acquisitions. Goodwill is not December 31 not first not no one not first January 2017, 2017 04, 350 2018, two two 2017 04, one not 9
Intangible Assets, Finite-Lived, Policy [Policy Text Block]	Intangible assets Intangible assets consist of allocated acquisition costs of PPAs, which are amortized using the straight-line method over the 13 to 29-year terms of the agreements (see Note 9 may not no no not
Impairment or Disposal of Long-Lived Assets, Policy [Policy Text Block]	Impairment of long-lived assets and long-lived assets to be disposed of The Company evaluates long-lived assets, such as property, plant and equipment and construction-in-process for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not not not not The Company tests its operating plants that are operated together as a complex for impairment at the complex level because the cash flows of such plants result from significant shared operating activities. For example, the operating power plants in a complex are managed under a combined operation management generally with one one not not not Recoverability of assets to be held and used is measured by a comparison of the carrying amount of an asset to the estimated future net undiscounted cash flows expected to be generated by the asset. The significant assumptions that the Company uses in estimating its undiscounted future cash flows include: (i) projected generating capacity of the complex or power plant and rates to be received under the respective PPAs and expected market rates thereafter and (ii) projected operating expenses of the relevant complex or power plant. Estimates of future cash flows used to test recoverability of a long-lived asset under development also include cash flows associated with all future expenditures necessary to develop the asset. If the assets are considered to be impaired, the impairment to be recognized is measured by the amount by which the carrying amount of the assets exceeds their fair value. Assets to be disposed of are reported at the lower of the carrying amount or fair value less costs to sell. Management believes that no impairment exists for long-lived assets; however, estimates as to the recoverability of such assets may may
Derivatives, Policy [Policy Text Block]	Derivative instruments Derivative instruments (including certain derivative instruments embedded in other contracts) are measured at their fair value and recorded as either assets or liabilities unless exempted from derivative treatment as a normal purchase and sale. All changes in the fair value of derivatives are recognized in earnings unless specific hedge criteria are met, which requires a company to formally document, designate and assess the effectiveness of transactions that receive hedge accounting. The Company maintains a risk management strategy that may not
Foreign Currency Transactions and Translations Policy [Policy Text Block]	Foreign currency translation The U.S. dollar is the functional currency for all of the Company’s consolidated operations and those of its equity affiliates except for the Guadeloupe power plant and the Company's operations in New Zealand. For those entities, all gains and losses from currency translations are included within the line item “Derivatives and foreign currency transaction gains (losses)” within the consolidated statements of operations and comprehensive income (loss). The Euro and New Zealand Dollar are the functional currencies of the Guadeloupe power plant and the Company's operations in New Zealand, respectively, and thus gains and losses from currency translation adjustments in those locations are included as currency translation adjustments in accumulated other comprehensive income in the consolidated statements of equity and in comprehensive income. The accumulated currency translation adjustments amounted to $1.5 million and $0.0 million as of December 31, 2019 2018,
Comprehensive Income, Policy [Policy Text Block]	Comprehensive income (loss) reporting Comprehensive income (loss) includes net income or loss plus other comprehensive income (loss), which for the Company consists of changes in unrealized gains or losses in respect of the Company’s share in derivatives instruments of an unconsolidated investment, foreign currency translation adjustments and changes in respect of derivative instruments designated as a cash flow hedge. The changes in foreign currency translation adjustments and gains or losses in respect of derivative instruments designated as a cash flow hedge during the years ended December 31, 2019, 2018 2017 5
Revenue [Policy Text Block]	Revenues and cost of revenues Upon adoption of ASU 2014 09, 606 January 1, 2018, 1 2 3 4 5 Revenues are primarily related to: (i) sale of electricity from geothermal and recovered energy-based power plants owned and operated by the Company; (ii) geothermal and recovered energy-based power plant equipment engineering, sale, construction and installation, and operating services and (iii) energy storage, demand-response and energy management related services as well as services relating to the engineering, procurement, construction, operation and maintenance of energy storage units. Electricity segment revenues July 1, 2003, five 8 606, 30 60 Product segment revenues third not not no one two In contracts for which the Company determines that control is not Accounting for product contracts that are satisfied over time includes use of several estimates such as variable consideration related to bonuses and penalties and total estimated cost for completing the contract. The estimated amount of variable consideration will be included in the transaction price only to the extent that it is probable that a significant reversal in the amount of cumulative revenue recognized will not The nature of the Company's product contracts give rise to several modifications or change requests by its customers. Substantially all of the modifications are treated as cumulative catch-ups to revenues since the additional goods are not one Energy Storage and Management Services segment revenues 606 may The Company's accounting policy for revenues included under the 2017 Revenues related to the sale of electricity from geothermal and recovered energy-based power plants and capacity payments are recorded based upon output delivered and capacity provided at rates specified under relevant contract terms. For PPAs agreed to, modified, or acquired in business combinations on or after July 1, 2003, five 8 Revenues from engineering, operating services, and parts and product sales are recorded upon providing the service or delivery of the products and parts and when collectability is reasonably assured. Revenues from the supply and/or construction of geothermal and recovered energy-based power plant equipment and other equipment to third may In specific instances where there is a lack of dependable estimates or inherent risks that may Contract assets related to the Company's Product segment reflect revenues recognized and performance obligations satisfied in advance of customer billing. Contract liabilities related to the Company's Product segment reflect payments received in advance of the satisfaction of performance under the contract. The Company receives payments from customers based on the terms established in the contracts. Total contract assets and contract liabilities as of December 31, 2019 2018 December 31, December 31, 2019 2018 (Dollars in thousands) Contract assets (*) $ 38,365 $ 42,130 Contract liabilities (*) (2,755 ) (18,402 ) Contract assets, net $ 35,610 $ 23,728 (*) Contract assets and contract liabilities are presented as "Costs and estimated earnings in excess of billings on uncompleted contracts" and "Billings in excess of costs and estimated earnings on uncompleted contracts", respectively, on the consolidated balance sheets. The contract liabilities balance at the beginning of the year was fully recognized as product revenues during the years ended December 31, 2019 2018 The following table presents the significant changes in the contract assets and contract liabilities for the years ended December 31, 2019 2018: Years Ended December 31, 2019 2018 Contract assets Contract liabilities Contract assets Contract liabilities (Dollars in thousands) Recognition of contract liabilities as revenue as a result of performance obligations satisfied $ — $ 12,675 $ — $ 33,349 Cash received in advance for which revenues have not yet recognized, net of expenditures made — (3,323 ) — (38,162 ) Reduction of contract assets as a result of rights to consideration becoming unconditional (130,918 ) — (128,659 ) — Contract assets recognized, net of recognized receivables 133,448 — 136,496 — Net change in contract assets and contract liabilities $ 2,530 $ 9,352 $ 7,837 $ (4,813 ) The timing of revenue recognition, billings and cash collections results in accounts receivable, contract assets and contract liabilities on the consolidated balance sheet. In the Company's Products segment, amounts are billed as work progresses in accordance with agreed-upon contractual terms, or upon achievement of contractual milestones. Generally, billing occurs subsequent to the recognition of revenue, resulting in contract assets. However, the Company sometimes receives advances or deposits from its customers before revenue can be recognized, resulting in contract liabilities. These assets and liabilities are reported on the consolidated balance sheet on a contract-by-contract basis at the end of each reporting period. The timing of billing its customers and receiving advance payments vary from contract to contract. The majority of payments are received no On December 31, 2019, not The following schedule reconciles revenues accounted under lease accounting, and ASC 606, December 31, 2019 2018: Year Ended December 31, 2019 2018 (Dollars in thousands) Electricity Revenues accounted under lease accounting $ 479,059 $ 481,619 Electricity, Product and Energy Storage and Management Services revenues accounted under ASC 606 266,985 237,648 Total consolidated revenues $ 746,044 $ 719,267 Disaggregated revenues from contracts with customers for the years ended December 31, 2019 2018 19
Termination fee [Policy Text Block]	Termination fee Fees to terminate PPAs are recognized in the period incurred as selling and marketing expenses. During 2018, 2 2018. 2019 2017, no
Standard Product Warranty, Policy [Policy Text Block]	Warranty on products sold The Company generally provides a one two December 31, 2019, 2018 2017.
Research and Development Expense, Policy [Policy Text Block]	Research and development Research and development costs incurred by the Company for the development of existing and new geothermal and recovered energy power plants as well as storage related technologies are expensed as incurred. Grants received from the DOE are offset against the related research and development expenses. There were no December 31, 2019, 2018 2017.
Share-based Payment Arrangement [Policy Text Block]	Stock-based compensation The Company accounts for stock-based compensation using the fair value method whereby compensation cost is measured at the grant date, based on the calculated fair value of the award, and is recognized as an expense over the requisite employee service period (generally the vesting period of the grant). The Company uses the Exercise Multiple-Based Lattice SAR-Pricing Model to value the stock-based compensation awards to reflect accumulated historic data retained of behavioral parameters.
Tax Monetization Transactions Policy [Policy Text Block]	Tax monetization Transactions The Company has three 3 13 2017 13. 470. 810. 835 7.
Income Tax, Policy [Policy Text Block]	Income taxes Income taxes are accounted for using the asset and liability approach, which requires the recognition of taxes payable or refundable for the current year and deferred tax assets and liabilities for the future tax consequences of events that have been recognized in the Company’s financial statements or tax returns. The measurement of current and deferred tax assets and liabilities are based on provisions of the enacted tax law. The Company accounts for investment tax credits and production tax credits as a reduction to income taxes in the year in which the credit arises. The measurement of deferred tax assets is reduced, if necessary, by the amount of any tax benefits that, based on available evidence, are more likely than not not
Earnings Per Share, Policy [Policy Text Block]	Earnings per share Basic earnings per share attributable to the Company’s stockholders (“earnings per share”) is computed by dividing net income or loss attributable to the Company’s stockholders by the weighted average number of shares of common stock outstanding for the period. The Company does not The table below shows the reconciliation of the number of shares used in the computation of basic and diluted earnings per share: Year Ended December 31, 2019 2018 2017 (In thousands) Weighted average number of shares used in computation of basic earnings per share 50,867 50,643 50,110 Add: Additional shares from the assumed exercise of employee stock options 360 326 659 Weighted average number of shares used in computation of diluted earnings per share 51,227 50,969 50,769 The number of stock-based awards that could potentially dilute future earnings per share and were not December 31, 2019, 2018 2017.
Use of Estimates, Policy [Policy Text Block]	Use of estimates in preparation of financial statements The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the dates of such financial statements and the reported amounts of revenues and expenses during the reporting periods. Actual results could differ from those estimates. The most significant estimates with regard to the Company’s consolidated financial statements relate to the useful lives of property, plant and equipment, impairment of goodwill and long-lived assets, including intangible assets, revenue recognition of product sales using the percentage of completion method, asset retirement obligations, and the provision for income taxes.
Redeemable Noncontrolling Interest, Policy [Policy Text Block]	Redeemable noncontrolling interest Changes in the carrying amount of the Company's Redeemable noncontrolling interest were as follows: 2019 2018 (Dollars in thousands) Redeemable noncontrolling interest as of January 1, $ 8,603 $ 6,416 Redeemable noncontrolling interest in results of operation of a consolidated subsidiary 1,132 990 Cash paid to noncontrolling interest (252 ) — Increase in share of redeemable noncontrolling interest — 1,528 Currency translation adjustments (233 ) (331 ) Redeemable noncontrolling interest as of December 31, $ 9,250 $ 8,603
Puna Power Plant, Policy [Policy Text Block]	Puna Power Plant On May 3, 2018, 38 three 2019, May 2018 2019, December 31, 2019. not As of February 2020, first 2020. one second 2020. third 2020 The Company continues to assess the accounting implications of this event on the assets and liabilities on its balance sheet and whether an impairment will be required. Any significant damage to the geothermal resource or continued shut-down following the lava event at the Puna facilities could have an adverse impact on the power plant's electricity generation and availability, which in turn could have a material adverse impact on the Company's business and results of operations.
New Accounting Pronouncements, Policy [Policy Text Block]	New Accounting Pronouncements New accounting pronouncements effective in the year ended December 31, 2019 Leases In February 2016, 2016 02, 842 two 606. January 1, 2019 no The Company is a lessee in operating lease transactions primarily consisting of land leases for its exploration and development activities as further described under Exploration and development costs above and the Puna power plant transaction as further described under Note 12 842, In accordance with the new standard, for agreements in which the Company is the lessee, the Company applies a unified accounting model by which it recognizes a right-of-use asset ("ROU") and a lease liability at the commencement date of the lease contract for all the leases in which the Company has a right to control identified assets for a specified period of time. The classification of the lease as a finance lease or an operating lease determines the subsequent accounting for the lease arrangement. Upon the adoption of the new standard the Company, both as a lessee and as a lessor, chose to apply the following permitted practical expedients: 1. Not 2. Not 840 840 3. Exclude initial direct costs from measurement of the ROU asset at the date of initial application; 4. Applying the practical expedient (for a lessor) to not 606 606. 5. Applying the practical expedient (for a lessee) regarding the recognition and measurement of short-term leases, for leases for a period of up to 12 Since the Company elected to apply the practical expedients above, it applied the new standard to all contracts entered into before January 1, 2019 840. The new significant accounting policies regarding leases that were applied as from January 1, 2019 1. Determining whether an arrangement contains a lease On the inception date of the lease, the Company determines whether the arrangement is a lease or contains a lease, while examining if it conveys the right to control the use of an identified asset for a period of time in exchange for consideration. 2. The Company as a lessee a. Lease classification: At the commencement date, a lease is a finance lease if it meets any one • The lease transfers ownership of the underlying asset to the lessee by the end of the lease term. • The lease grants the lessee an option to purchase the underlying asset that the lessee is reasonably certain to exercise. • The lease term is for the major part of the remaining economic life of the underlying asset. • The present value of the sum of the lease payments and any residual value guaranteed by the lessee that is not • The underlying asset is of such a specialized nature that it is expected to have no b. Leased assets and lease liabilities - initial recognition Upon initial recognition, the Company recognizes a liability at the present value of the lease payments to be made over the lease term, and concurrently recognizes a ROU asset at the same amount of the liability, adjusted for any prepaid or accrued lease payments, plus initial direct costs incurred in respect of the lease. Since the interest rate implicit in the lease is not c. The lease term The lease term is the non-cancellable period of the lease plus periods covered by an extension or termination option if it is reasonably certain that the Company will exercise the option. d. Subsequent measurement of operating leases After lease commencement, the Company measures the lease liability at the present value of the remaining lease payments using the discount rate determined at lease commencement (as long as the discount rate has not The Company subsequently measures the ROU asset at the present value of the remaining lease payments, adjusted for the remaining balance of any lease incentives received, any cumulative prepaid or accrued rent if the lease payments are uneven throughout the lease term and any unamortized initial direct costs. Further, the Company will recognize lease expense on a straight-line basis over the lease term. e. Subsequent measurement of finance leases After lease commencement, the Company measures the lease liability by increasing the carrying amount to reflect interest on the lease liability and reducing the carrying amount to reflect the lease payments made during the period. The Company shall determine the interest on the lease liability in each period during the lease term as the amount that produces a constant periodic discount rate on the remaining balance of the liability, taking into consideration the reassessment requirements. After lease commencement, the Company measures the ROU assets at cost less any accumulated amortization and any accumulated impairment losses, taking into consideration the reassessment requirements. The Company amortizes the ROU asset on a straight-line basis, unless another systematic basis better represents the pattern in which the Company expects to consume the ROU asset’s future economic benefits. The ROU asset is amortized over the shorter of the lease term or the useful life of the ROU asset as follows: (in years) Land 1 - 35 Vehicles 5 Building 15 The total periodic expense (the sum of interest and amortization expense) of a finance lease is typically higher in the early periods and lower in the later periods. f. Variable lease payments: Variable lease payments that depend on an index or a rate On the commencement date, the lease payments shall include variable lease payments that depend on an index or a rate (such as the Consumer Price Index or a market interest rate), initially measured using the index or rate at the commencement date. The Company does not Other variable lease payments: Variable payments that depends on performance or use of the underlying asset are not 3. The Company as a lessor At lease commencement, the Company as a lessor classifies leases as either finance or operating leases. Finance leases are further classified as a sales-type lease or as a direct financing lease. Under an operating lease, the Company recognizes the lease payment as income over the lease term, generally on a straight-line basis or as earned. 4. Impact of the new standard a) The effects of the initial application of the new standard on the Company's consolidated balance sheet as of January 1, 2019 According to the previous accounting policy The change As presented according to Topic 842 (Dollars in thousands) As of January 1, 2019: Prepaid expenses and other $ 51,441 $ (35,385 ) $ 16,056 Deferred financing and lease costs, net 3,242 (1,659 ) 1,583 Property, plant and equipment, net 1,959,578 (12,855 ) 1,946,723 Operating leases right of use — 62,244 62,244 Finance leases right of use — 13,476 13,476 Accounts payable and accrued expenses 116,362 (2,860 ) 113,502 Current maturity of operating lease liabilities — 7,532 7,532 Current maturity of finance lease liabilities — 2,841 2,841 Other long-term liabilities 16,087 (9,970 ) 6,117 Long term portion of operating lease liabilities — 17,668 17,668 Long term portion of finance lease liabilities — 10,668 10,668 Retained earnings 422,222 (58 ) 422,164 The operating leases right of use is higher than the related lease liabilities as a result of prepayments of leases, including the Puna lease and deferred financing lease costs. b) A weighted-average nominal incremental interest rate of 5% and 7% was used to discount future lease payments in the calculation of the lease liabilities in respect of operating leases and in respect of finance leases, respectively. Derivatives and Hedging In August 2017, 2017 12, December 15, 2018, not Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income In February 2018, 2018 02, 220 2017 December 15, 2018, not New accounting pronouncements effective in future periods Financial Instruments - Credit Losses In June 2016, 2016 13, Financial Instruments-Credit Losses (Topic 326 . November 2018, 2018 19, 326, 2018 19 not January 1, 2020, not Accounting for Income Taxes In December 2019, 2019 12, 740 2019 12 740. December 15, 2020 not 2019 12 December 31, 2019. not 2019 12

Note 1 - Business and Signifi_2

Note 1 - Business and Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Schedule of Cash and Cash Equivalents [Table Text Block]	December 31, 2019 2018 2017 (Dollars in thousands) Cash and cash equivalents $ 71,173 $ 98,802 $ 47,818 Restricted cash and cash equivalents 81,937 78,693 48,825 Total cash and cash equivalents and restricted cash and cash equivalents $ 153,110 $ 177,495 $ 96,643
Schedule Of Estimated Useful Lives [Table Text Block]	Buildings (in years) 25 Leasehold improvements (in years) 15 - 20 Machinery and equipment — manufacturing and drilling (in years) 10 Machinery and equipment — computers (in years) 3 - 5 Office equipment — furniture and fixtures (in years) 5 - 15 Office equipment — other (in years) 5 - 10 Vehicles (in years) 5 - 7
Contract with Customer, Asset and Liability [Table Text Block]	December 31, December 31, 2019 2018 (Dollars in thousands) Contract assets (*) $ 38,365 $ 42,130 Contract liabilities (*) (2,755 ) (18,402 ) Contract assets, net $ 35,610 $ 23,728 Years Ended December 31, 2019 2018 Contract assets Contract liabilities Contract assets Contract liabilities (Dollars in thousands) Recognition of contract liabilities as revenue as a result of performance obligations satisfied $ — $ 12,675 $ — $ 33,349 Cash received in advance for which revenues have not yet recognized, net of expenditures made — (3,323 ) — (38,162 ) Reduction of contract assets as a result of rights to consideration becoming unconditional (130,918 ) — (128,659 ) — Contract assets recognized, net of recognized receivables 133,448 — 136,496 — Net change in contract assets and contract liabilities $ 2,530 $ 9,352 $ 7,837 $ (4,813 )
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]	Year Ended December 31, 2019 2018 (Dollars in thousands) Electricity Revenues accounted under lease accounting $ 479,059 $ 481,619 Electricity, Product and Energy Storage and Management Services revenues accounted under ASC 606 266,985 237,648 Total consolidated revenues $ 746,044 $ 719,267 According to the previous accounting policy The change As presented according to Topic 842 (Dollars in thousands) As of January 1, 2019: Prepaid expenses and other $ 51,441 $ (35,385 ) $ 16,056 Deferred financing and lease costs, net 3,242 (1,659 ) 1,583 Property, plant and equipment, net 1,959,578 (12,855 ) 1,946,723 Operating leases right of use — 62,244 62,244 Finance leases right of use — 13,476 13,476 Accounts payable and accrued expenses 116,362 (2,860 ) 113,502 Current maturity of operating lease liabilities — 7,532 7,532 Current maturity of finance lease liabilities — 2,841 2,841 Other long-term liabilities 16,087 (9,970 ) 6,117 Long term portion of operating lease liabilities — 17,668 17,668 Long term portion of finance lease liabilities — 10,668 10,668 Retained earnings 422,222 (58 ) 422,164
Schedule of Weighted Average Number of Shares [Table Text Block]	Year Ended December 31, 2019 2018 2017 (In thousands) Weighted average number of shares used in computation of basic earnings per share 50,867 50,643 50,110 Add: Additional shares from the assumed exercise of employee stock options 360 326 659 Weighted average number of shares used in computation of diluted earnings per share 51,227 50,969 50,769
Redeemable Noncontrolling Interest [Table Text Block]	2019 2018 (Dollars in thousands) Redeemable noncontrolling interest as of January 1, $ 8,603 $ 6,416 Redeemable noncontrolling interest in results of operation of a consolidated subsidiary 1,132 990 Cash paid to noncontrolling interest (252 ) — Increase in share of redeemable noncontrolling interest — 1,528 Currency translation adjustments (233 ) (331 ) Redeemable noncontrolling interest as of December 31, $ 9,250 $ 8,603
ROA Asset [Member]
Notes Tables
Schedule Of Estimated Useful Lives [Table Text Block]	(in years) Land 1 - 35 Vehicles 5 Building 15

Note 2 - Business Acquisition_2

Note 2 - Business Acquisitions and Others (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block]	Cash and cash equivalents and restricted cash $ 37.9 Property, plant and equipment and construction-in-process 77.3 Intangible assets (1) 127.0 Goodwill (2) 12.7 Deferred taxes 1.7 Total assets acquired $ 256.6 Other working capital $ (8.2 ) Long-term term debt (98.3 ) Asset retirement obligation (9.0 ) Noncontrolling interest (34.9 ) Total liabilities assumed $ (150.4 ) Total assets acquired, and liabilities assumed, net $ 106.2
Business Acquisition, Pro Forma Information [Table Text Block]	Pro forma for the Pro forma for the year ended December 31, 2018 year ended December 31, 2017 (Dollars in thousands) Electricity revenues $ 521,175 $ 497,650 Total revenues 730,563 724,869 Income from continuing operations before income taxes and equity in losses of investees 134,142 169,546

Note 3 - Inventories (Tables)

Note 3 - Inventories (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Schedule of Inventory, Current [Table Text Block]	December 31, 2019 2018 (Dollars in thousands) Raw materials and purchased parts for assembly $ 21,942 $ 26,914 Self-manufactured assembly parts and finished products 13,007 18,110 Total $ 34,949 $ 45,024

Note 4 - Cost and Estimated E_2

Note 4 - Cost and Estimated Earnings on Uncompleted Contracts (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Cost And Estimated Earnings On Uncompleted Contracts [Table Text Block]	December 31, 2019 2018 (Dollars in thousands) Costs and estimated earnings incurred on uncompleted contracts $ 196,550 $ 278,797 Less billings to date (160,940 ) (255,069 ) Total $ 35,610 $ 23,728
Cost and Estimated Earnings on Uncompleted Contracts Included in Consolidated Balance Sheets [Table Text Block]	December 31, 2019 2018 (Dollars in thousands) Costs and estimated earnings in excess of billings on uncompleted contracts $ 38,365 $ 42,130 Billings in excess of costs and estimated earnings on uncompleted contracts (2,755 ) (18,402 ) Total $ 35,610 $ 23,728

Note 5 - Investment in an Unc_2

Note 5 - Investment in an Unconsolidated Company (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Equity Method Investments [Table Text Block]	December 31, 2019 2018 (Dollars in thousands) Sarulla $ 70,589 $ 71,983 Ijen 10,551 — Total investment in unconsolidated companies $ 81,140 $ 71,983
Other Comprehensive Income (Loss) from Equity Method Investments[Table Text Block]	Year Ended December 31, 2019 2018 (Dollars in thousands) Change, net of deferred tax, in unrealized gains (losses) in respect of the Company’s share in derivative instruments of unconsolidated investment $ (3,417 ) $ 2,235

Note 6 - Variable Interest En_2

Note 6 - Variable Interest Entities (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Schedule of Variable Interest Entities [Table Text Block]	December 31, 2019 Project Debt PPAs (Dollars in thousands) Assets: Restricted cash and cash equivalents $ 81,522 $ 20 Other current assets 164,386 29,076 Property, plant and equipment, net 1,211,656 668,891 Construction-in-process 10,188 139,642 Other long-term assets 162,995 40,138 Total assets $ 1,630,747 $ 877,767 Liabilities: Accounts payable and accrued expenses 25,361 13,201 Long-term debt 794,214 — Other long-term liabilities 126,851 32,790 Total liabilities 946,426 45,991 December 31, 2018 Project Debt PPAs (Dollars in thousands) Assets: Restricted cash and cash equivalents $ 76,019 2,304 Other current assets 213,007 9,698 Property, plant and equipment, net 1,552,408 306,820 Construction-in-process 90,812 13,273 Other long-term assets 177,723 9,104 Total assets $ 2,109,969 341,199 Liabilities: Accounts payable and accrued expenses $ 24,245 2,651 Long-term debt 805,850 — Other long-term liabilities 125,769 12,483 Total liabilities $ 955,864 15,134

Note 7 - Fair Value of Financ_2

Note 7 - Fair Value of Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Fair Value, by Balance Sheet Grouping [Table Text Block]	December 31, 2019 Fair Value Carrying Value at December 31, 2019 Total Level 1 Level 2 Level 3 (Dollars in thousands) Assets: Current assets: Cash equivalents (including restricted cash accounts) $ 28,316 $ 28,316 $ 28,316 $ — $ — Derivatives: Contingent receivable (1) 102 102 — — 102 Currency forward contracts (2) 362 362 — 362 — Liabilities: Current liabilities: Derivatives: Contingent payables (1) (3,359 ) (3,359 ) — — (3,359 ) $ 25,421 $ 25,421 $ 28,316 $ 362 $ (3,257 ) December 31, 2018 Fair Value Carrying Value at December 31, 2018 Total Level 1 Level 2 Level 3 (Dollars in thousands) Assets Current assets: Cash equivalents (including restricted cash accounts) $ 18,787 $ 18,787 $ 18,787 $ — $ — Derivatives: Contingent receivable (1) 104 104 — — 104 Liabilities: Current liabilities: Derivatives: Contingent payables (1) (3,424 ) (3,424 ) — — (3,424 ) Currency forward contracts (2) (1,040 ) (1,040 ) — (1,040 ) — $ 14,427 $ 14,427 $ 18,787 $ (1,040 ) $ (3,320 )
Derivative Instruments, Gain (Loss) [Table Text Block]	Derivatives not designated as hedging instruments Location of recognized gain (loss) Amount of recognized gain (loss) 2019 2018 2017 (Dollars in thousands) Put options on natural gas price Derivative and foreign currency transaction gains (losses) $ — $ — $ (350 ) Contingent considerations Derivative and foreign currency transaction gains (losses) — 170 (129 ) Contingent considerations General and administrative expenses — 10,322 2,048 Currency forward contracts Derivative and foreign currency transaction gains (losses) 2,556 (3,081 ) 3,699 $ 2,556 $ 7,411 $ 5,268
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]	Fair Value Carrying Amount 2019 2018 2019 2018 (Dollars in millions) (Dollars in millions) Olkaria III Loan - OPIC $ 202.1 $ 211.8 $ 192.6 $ 210.6 Olkaria III plant 4 Loan - DEG 2 43.8 47.2 42.5 47.5 Olkaria III plant 1 Loan - DEG 3 38.8 — 37.1 — Platanares Loan - OPIC 115.3 119.1 104.5 112.7 Amatitlan Loan 26.4 29.9 26.3 29.8 Senior Secured Notes: OrCal Geothermal Inc. ("OrCal") — 19.0 — 18.7 OFC 2 LLC ("OFC 2") 210.9 214.5 203.0 217.8 Don A. Campbell 1 ("DAC 1") 78.5 78.8 78.2 83.3 USG Prudential - NV 30.6 29.4 28.4 27.8 USG Prudential - ID 18.6 18.6 19.6 18.9 USG DOE 45.0 48.3 40.8 51.4 Senior Unsecured Bonds 205.7 199.4 204.3 204.3 Senior Unsecured Loan 161.3 102.2 150.0 100.0 Plumstriker 21.7 — 21.6 — Other long-term debt 16.3 5.4 17.4 6.2
Fair Value, Liabilities Measured on Recurring and Nonrecurring Basis [Table Text Block]	Level 1 Level 2 Level 3 Total (Dollars in millions) Olkaria III - OPIC $ — $ — $ 202.1 $ 202.1 Olkaria III plant 4 - DEG 2 — — 43.8 43.8 Olkaria III plant 1 - DEG 3 — — 38.8 38.8 Platanares Loan - OPIC — — 115.3 115.3 Amatitlan Loan — 26.4 — 26.4 Senior Secured Notes: OFC 2 Senior Secured Notes — — 210.9 210.9 DAC 1 Senior Secured Notes — — 78.5 78.5 USG Prudential - NV — — 30.6 30.6 USG Prudential - ID — — 18.6 18.6 USG DOE — — 45.0 45.0 Senior Unsecured Bonds — — 205.7 205.7 Senior Unsecured Loan — — 161.3 161.3 Plumstriker — 21.7 — 21.7 Other long-term debt — — 16.3 16.3 Commercial paper — 50.0 — 50.0 Revolving lines of credit — 40.6 — 40.6 Deposits 12.2 — — 12.2 Level 1 Level 2 Level 3 Total (Dollars in millions) Olkaria III Loan - OPIC $ — $ — $ 211.8 $ 211.8 Olkaria III plant 4 - DEG 2 — — 47.2 47.2 Platanares Loan - OPIC — — 119.1 119.1 Amatitlan Loan — 29.9 — 29.9 Senior Secured Notes: OrCal Senior Secured Notes — — 19.0 19.0 OFC 2 Senior Secured Notes — — 214.5 214.5 DAC 1 Senior Secured Notes — — 78.8 78.8 USG Prudential - NV — — 29.4 29.4 USG Prudential - ID — — 18.6 18.6 USG DOE — — 48.3 48.3 Senior Unsecured Bonds — — 199.4 199.4 Senior Unsecured Loan — — 102.2 102.2 Other long-term debt — — 5.4 5.4 Revolving lines of credit — 159.0 — 159.0 Deposits 12.0 — — 12.0

Note 8 - Property, Plant and _2

Note 8 - Property, Plant and Equipment and Construction-in-process (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Property, Plant and Equipment [Table Text Block]	December 31, 2019 2018 (Dollars in thousands) Land owned by the Company where the geothermal resource is located $ 38,049 $ 38,060 Leasehold improvements 7,757 5,718 Machinery and equipment 230,465 208,646 Land, buildings and office equipment 39,099 35,708 Vehicles 8,021 22,074 Geothermal and recovered energy generation power plants, including geothermal wells and exploration and resource development costs: United States of America, net of cash grants 2,160,910 2,065,377 Foreign countries 721,824 710,775 Asset retirement cost 19,824 11,448 3,225,949 3,097,806 Less accumulated depreciation (1,254,534 ) (1,138,228 ) Property, plant and equipment, net $ 1,971,415 $ 1,959,578
Construction In Progress [Table Text Block]	December 31, 2019 2018 (Dollars in thousands) Projects under exploration and development: Up-front bonus costs $ 17,018 $ 17,018 Exploration and development costs 66,916 53,237 Interest capitalized 703 703 84,637 70,958 Projects under construction: Up-front bonus costs 27,473 27,473 Drilling and construction costs 258,484 160,398 Interest capitalized 5,961 2,861 291,918 190,732 Total $ 376,555 $ 261,690
Rollforward Of Construction In Process [Table Text Block]	Projects under exploration and development Up-front Bonus Costs Exploration and Development Costs Interest Capitalized Total (Dollars in thousands) Balance at December 31, 2016 $ 17,385 $ 36,359 $ 703 $ 54,447 Cost incurred during the year — 11,224 — 11,224 Write off of unsuccessful exploration costs (367 ) (1,429 ) — (1,796 ) Balance at December 31, 2017 17,018 46,154 703 63,875 Cost incurred during the year — 7,209 — 7,209 Write off of unsuccessful exploration costs — (126 ) — (126 ) Balance at December 31, 2018 17,018 53,237 703 70,958 Cost incurred during the year — 17,215 — 17,215 Transfer of projects under exploration and development to projects under construction — (3,536 ) — (3,536 ) Balance at December 31, 2019 $ 17,018 $ 66,916 $ 703 $ 84,637 Projects under construction Up-front Bonus Drilling and Construction Costs Interest Capitalized Total (Dollars in thousands) Balance at December 31, 2016 $ 37,713 $ 202,211 $ 12,338 $ 252,262 Cost incurred during the year — 231,926 7,300 239,226 Transfer of completed projects to property, plant and equipment (10,240 ) (235,194 ) (16,387 ) (261,821 ) Balance at December 31, 2017 27,473 198,943 3,251 229,667 Cost incurred during the year — 219,610 — 219,610 Cost write off — (1,380 ) — (1,380 ) Fair value of projects under construction acquired in a business combination — 4,668 — 4,668 Transfer of completed projects to property, plant and equipment — (261,443 ) (390 ) (261,833 ) Balance at December 31, 2018 27,473 160,398 2,861 190,732 Cost incurred during the year — 264,137 3,100 267,237 Transfer of projects under exploration and development to projects under construction — 3,536 — 3,536 Insurance recoveries — (35,435 ) — (35,435 ) Transfer of completed projects to property, plant and equipment — (134,152 ) — (134,152 ) Balance at December 31, 2019 $ 27,473 $ 258,484 $ 5,961 $ 291,918

Note 9 - Intangible Assets an_2

Note 9 - Intangible Assets and Goodwill (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block]	(Dollars in thousands) Year ending December 31: 2020 $ 12,983 2021 12,983 2022 12,729 2023 12,610 2024 11,255 Thereafter 123,660 Total $ 186,220
Schedule of Goodwill [Table Text Block]	2019 2018 (Dollars in thousands) Goodwill as of January 1, $ 19,950 $ 21,037 Goodwill acquired — 12,710 Goodwill impairment charge — (13,464 ) Translation differences 190 (333 ) Goodwill as of December 31, $ 20,140 $ 19,950

Note 10 - Accounts Payable an_2

Note 10 - Accounts Payable and Accrued Expenses (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Schedule of Accounts Payable and Accrued Liabilities [Table Text Block]	December 31, 2019 2018 (Dollars in thousands) Trade payable $ 73,271 $ 56,299 Salaries and other payroll costs 24,364 20,188 Customer advances 2,092 918 Accrued interest 6,321 5,914 Income tax payable 11,344 8,436 Property tax payable 3,033 2,999 Scheduling and transmission 2,264 595 Royalty accrual 6,457 4,610 Deferred revenues — 2,300 Warranty accrual 3,245 4,552 Other 9,466 9,551 Total $ 141,857 $ 116,362

Note 11 - Long-term Debt, Cre_2

Note 11 - Long-term Debt, Credit Agreements and Commercial Paper (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Schedule of Long-term Debt Instruments [Table Text Block]	December 31, 2019 2018 (Dollars in thousands) Limited and non-recourse agreements: Loans: Non-recourse: Other loans $ 8,997 $ 6,241 Limited recourse: Loan agreement with OPIC (the Olkaria III power plant) 192,646 210,641 Loan agreement with OPIC (the Platanares power plant) 104,459 112,652 Loan agreement with Banco Industrial S.A. and Westrust Bank (International) Limited 26,250 29,750 Loan agreement with a global industrial company (the Plumstriker battery energy storage projects) 21,615 — Other loans 8,367 — Senior Secured Notes: Non-recourse: OrCal Senior Secured Notes — 18,652 DAC 1 Senior Secured Notes 78,247 83,319 Limited recourse: OFC 2 Senior Secured Notes 203,040 217,810 Other loans 88,840 96,482 Total limited and non-recourse agreements 732,461 775,547 Less current portion (58,932 ) (63,180 ) Non current portion $ 673,529 $ 712,367 Full recourse agreements: Senior Unsecured Bonds 204,332 204,332 Senior Unsecured Loan (Migdal) 150,000 100,000 Loan agreements with DEG (the Olkaria III and power plants 4 and 1 upgrade) 79,632 47,500 Revolving credit lines with banks 40,550 159,000 Total full recourse agreements 474,514 510,832 Less current portion (117,122 ) (164,000 ) Non current portion $ 357,392 $ 346,832
Schedule of Maturities of Long-term Debt [Table Text Block]	(Dollars in thousands) Year ending December 31: 2020 $ 135,504 2021 76,259 2022 220,677 2023 98,982 2024 78,600 Thereafter 557,890 Total $ 1,167,912

Note 14 - Asset Retirement Ob_2

Note 14 - Asset Retirement Obligation (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Schedule of Asset Retirement Obligations [Table Text Block]	Year Ended December 31, 2019 2018 (Dollars in thousands) Balance at beginning of year $ 39,475 $ 27,110 Revision in estimated cash flows (335 ) (258 ) Liabilities incurred and acquired 8,334 10,149 Accretion expense 2,709 2,474 Balance at end of year $ 50,183 $ 39,475

Note 15 - Stock-based Compens_2

Note 15 - Stock-based Compensation (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]	Year Ended December 31, 2019 2018 2017 (Dollars in thousands) Cost of revenues $ 3,633 $ 3,488 $ 3,369 Selling and marketing expenses 4,810 792 452 General and administrative expenses 916 5,938 4,939 Total stock-based compensation expense 9,359 10,218 8,760 Tax effect on stock-based compensation expense 736 668 604 Net effect of stock-based compensation expense $ 8,623 $ 9,550 $ 8,156
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]	Year Ended December 31, 2019 2018 2017 For stock based awards issued by the Company: Risk-free interest rates 1.8 % 2.8 % 1.9 % Expected lives (in weighted average years) 3.5 3.5 3.1 Dividend yield 0.7 % 0.9 % 0.62 % Expected volatility (weighted average) 25.1 % 25.5 % 27.2 % Year Ended December 31, 2019 2018 2017 Weighted average forfeiture rate 8.6 % 3.1 % — %
Schedule of Share-based Payment Award, Equity Awards Other than Options, Valuation Assumptions [Table Text Block]	Risk-free interest rate 1.79 % Expected life (in years) 3.5 Dividend yield 0.57 % Expected volatility 24.80 % Forfeiture rate for directors 0.0 % Sub-Optimal Exercise Factor for directors 2.8
Share-based Payment Arrangement, Option and Stock Appreciation Rights, Activity [Table Text Block]	Year Ended December 31, 2019 2018 2017 Awards (In thousands) Weighted Average Exercise Price Awards (In thousands) Weighted Average Exercise Price Awards (In thousands) Weighted Average Exercise Price Outstanding at beginning of year 2,527 $ 46.77 1,548 $ 41.35 2,565 $ 33.36 Granted, at fair value: Stock Options — — — — 30 57.97 SARs* 38 69.13 1,172 53.87 132 62.55 RSUs** 9 — 74 — 23 — Exercised (711 ) 37.83 (203 ) 29.75 (1,181 ) 25.92 Forfeited (71 ) 50.59 (64 ) 45.73 (21 ) 46.15 Expired — — — — — — Outstanding at end of year 1,792 50.39 2,527 46.77 1,548 41.35 Options and SARs exercisable at end of year 479 48.35 846 42.06 431 32.61 Weighted-average fair value of options and SARs granted during the year $ 29.24 $ 16.45 $ 22.82
Share-based Payment Arrangement, Option, Exercise Price Range [Table Text Block]	Awards Outstanding Awards Exercisable Exercise Price Number of Stock-based Awards Outstanding Weighted Average Remaining Contractual Life in Years Aggregate Intrinsic Value Number of Stock-based Awards Exercisable Weighted Average Remaining Contractual Life in Years Aggregate Intrinsic Value $ — 59 1.5 $ 4,369 — — $ — 42.87 427 2.5 13,517 230 2.5 7,295 47.46 15 3.9 406 15 3.9 406 51.71 8 5.0 182 — — — 53.16 35 4.9 756 15 4.9 329 53.44 783 4.5 16,498 — — — 55.16 296 3.9 5,724 131 3.9 2,527 57.97 30 4.6 497 30 4.6 497 58.79 12 2.5 187 6 2.5 94 63.35 98 3.9 1,094 52 3.9 581 71.71 4 5.6 11 — — — 72.14 15 5.7 36 — — — 76.43 10 5.9 — — — — 1,792 3.8 $ 43,277 479 3.2 $ 11,729 Awards Outstanding Awards Exercisable Exercise Price Number of Stock-based Awards Outstanding Weighted Average Remaining Contractual Life in Years Aggregate Intrinsic Value Number of Stock-based Awards Exercisable Weighted Average Remaining Contractual Life in Years Aggregate Intrinsic Value $ — 75 1.8 $ 3,933 — — $ — 20.13 29 0.3 924 29 0.3 924 23.34 99 0.4 2,897 99 0.4 2,897 35.15 15 4.1 257 15 4.1 257 38.24 15 3.8 211 15 3.8 211 42.87 942 3.5 8,879 521 3.5 4,918 47.46 38 4.9 182 38 4.9 182 53.16 35 5.9 — — — — 53.44 828 5.5 — — — — 55.16 296 4.9 — 66 4.9 — 57.97 30 5.6 — 30 5.6 — 58.79 16 3.5 — — — — 63.35 109 4.9 — 33 4.9 — 2,527 4.3 $ 17,283 846 3.3 $ 9,389

Note 17 - Interest Expense, N_2

Note 17 - Interest Expense, Net (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Schedule of Other Nonoperating Expense, by Component [Table Text Block]	Year Ended December 31, 2019 2018 2017 (Dollars in thousands) Interest related to sale of tax benefits $ 11,786 $ 11,284 $ 6,985 Interest expense 71,883 63,368 54,381 Less — amount capitalized (3,285 ) (3,728 ) (7,224 ) $ 80,384 $ 70,924 $ 54,142

Note 18 - Income Taxes (Tables)

Note 18 - Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]	Year Ended December 31, 2019 2018 2017 (Dollars in thousands) U.S $ 14,187 $ 14,097 $ 13,680 Non-U.S. (foreign) 123,116 123,084 157,050 Total income from continuing operations, before income taxes and equity in losses $ 137,303 $ 137,181 $ 170,730
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]	Year Ended December 31, 2019 2018 2017 (Dollars in thousands) Current: Federal $ — $ 0 $ 43,935 State 172 381 43 Foreign 16,969 14,992 11,186 Total current income tax expense $ 17,141 $ 15,373 $ 55,164 Deferred: Federal (12,179 ) (6,886 ) (55,718 ) State 4,671 (2,595 ) (3,284 ) Foreign 35,980 28,841 25,502 Total deferred tax provision (benefit) 28,472 19,360 (33,500 ) Total Income tax provision $ 45,613 $ 34,733 $ 21,664
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	Year Ended December 31, 2019 2018 2017 U.S. federal statutory tax rate 21.0 % 21.0 % 35.0 % Impact of federal tax reform 0.0 2.6 (12.4 ) Transition tax inclusion — (5.7 ) 42.1 Foreign tax credits (22.8 ) (4.2 ) (50.5 ) Withholding tax 10.4 5.9 34.1 Valuation allowance - U.S (3.7 ) (17.2 ) (22.6 ) State income tax, net of federal benefit 3.7 1.0 1.1 Uncertain tax positions 2.1 2.1 — Effect of foreign income tax, net 9.7 5.6 (10.7 ) Production tax credits (5.0 ) (3.1 ) (1.2 ) Subpart F income 0.5 0.5 1.7 Tax on global intangible low-tax income 16.9 18.6 — Intra-entity transfers of assets other than inventory 0.3 (2.1 ) — Other, net 0.1 0.3 (3.9 ) Effective tax rate 33.2 % 25.3 % 12.7 %
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]	December 31, 2019 2018 (Dollars in thousands) Deferred tax assets (liabilities): Net foreign deferred taxes, primarily depreciation $ (88,508 ) $ (57,202 ) Depreciation (21,958 ) (30,500 ) Intangible drilling costs (1,405 ) 7,370 Net operating loss carryforward - U.S. 45,307 65,020 Tax monetization transaction (30,964 ) (17,104 ) Right-of-use assets (3,715 ) — Lease liabilities 3,755 — State and Investment tax credits 813 813 Production tax credits 100,524 90,913 Foreign tax credits 92,497 58,072 Withholding tax (15,539 ) (8,052 ) Stock options amortization 1,409 1,440 Basis difference in partnership interest (39,622 ) (36,516 ) Excess business interest 6,189 — Accrued liabilities and other 1,013 624 49,796 74,878 Less - valuation allowance (17,412 ) (22,441 ) Total $ 32,384 $ 52,437
Summary of Valuation Allowance [Table Text Block]	2019 2018 2017 (Dollars in thousands) Balance at beginning of the year $ 22,441 $ 77,571 $ 116,234 Additions to valuation allowance 15,437 4,747 46,560 Release of valuation allowance (20,466 ) (59,877 ) (85,223 ) Balance at end of the year $ 17,412 $ 22,441 $ 77,571
Schedule of Deferred Taxes Classified in Balance Sheet [Table Text Block]	Year Ended December 31, 2019 2018 2017 (Dollars in thousands) Non-current deferred tax assets $ 129,510 $ 113,760 $ 57,337 Non-current deferred tax liabilities (97,126 ) (61,323 ) (61,961 ) Non-current deferred tax assets, net 32,384 52,437 (4,624 ) Uncertain tax benefit offset (1) (95 ) (95 ) (95 ) $ 32,289 $ 52,342 $ (4,719 )
Summary of Income Tax Contingencies [Table Text Block]	Year Ended December 31, 2019 2018 2017 (Dollars in thousands) Balance at beginning of year $ 8,820 $ 6,357 $ 4,609 Additions based on tax positions taken in prior years 104 293 5 Additions based on tax positions taken in the current year 2,314 2,446 2,580 Reduction based on tax positions taken in prior years (615 ) (276 ) (837 ) Balance at end of year $ 10,623 $ 8,820 $ 6,357
Summary of Income Tax Examinations [Table Text Block]	Israel 2015 - 2019 Kenya 2013 - 2019 Guatemala 2015 - 2019 Honduras 2015 - 2019 Guadeloupe 2017 - 2019 New Zealand 2012 - 2019

Note 19 - Business Segments (Ta

Note 19 - Business Segments (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Schedule of Segment Reporting Information, by Segment [Table Text Block]	Electricity Product ESMS Consolidated (Dollars in thousands) Year Ended December 31, 2019: Revenues from external customers: United States (1) $ 333,797 $ 30,562 $ 13,597 $ 377,956 Foreign (2) 206,536 160,447 1,105 368,088 Net revenues from external customers 540,333 191,009 14,702 746,044 Intersegment revenues — 84,614 — 84,614 Depreciation and amortization expense 138,426 5,308 5,027 148,761 Operating income (loss) 177,192 23,180 (6,576 ) 193,796 Segment assets at period end (3) (*) 3,044,909 126,018 79,567 3,250,494 Expenditures for long-lived assets 259,898 9,156 10,932 279,986 * Including unconsolidated investments 81,140 — — 81,140 Year Ended December 31, 2018: Revenues from external customers: United States (1) 305,962 14,999 7,645 328,606 Foreign (2) 203,917 186,744 — 390,661 Net revenues from external customers $ 509,879 $ 201,743 $ 7,645 $ 719,267 Intersegment revenues — 48,817 — 48,817 Depreciation and amortization expense 126,181 4,311 1,741 132,233 Operating income (loss) 155,546 38,083 (8,519 ) 185,110 Segment assets at period end (3) (*) 2,896,938 156,942 67,470 3,121,350 Expenditures for long-lived assets 219,803 9,993 28,725 258,521 * Including unconsolidated investments 71,983 — — 71,983 Year Ended December 31, 2017: Revenues from external customers $ 465,593 $ 224,483 $ 2,736 $ 692,812 Intersegment revenues — 109,040 — 109,040 Depreciation and amortization expense 109,928 3,470 1,748 115,146 Operating income (loss) 157,613 50,543 (3,138 ) 205,018 Segment assets at period end (3) (*) 2,457,514 115,713 50,637 2,623,864 Expenditures for long-lived assets 252,581 6,653 — 259,234 * Including unconsolidated investments 34,084 — — 34,084
Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block]	Year Ended December 31, 2019 2018 2017 (Dollars in thousands) Revenues: Total segment revenues $ 746,044 $ 719,267 $ 692,812 Intersegment revenues 84,614 48,817 109,040 Elimination of intersegment revenues (84,614 ) (48,817 ) (109,040 ) Total consolidated revenues $ 746,044 $ 719,267 $ 692,812 Operating income: Operating income $ 193,796 $ 185,110 $ 205,018 Interest income 1,515 974 988 Interest expense, net (80,384 ) (70,924 ) (54,142 ) Derivatives and foreign currency transaction gains (losses) 624 (4,761 ) 2,654 Income attributable to sale of tax benefits 20,872 19,003 17,878 Other non-operating income (expense), net 880 7,779 (1,666 ) Total consolidated income before income taxes and equity in earnings of investees $ 137,303 $ 137,181 $ 170,730
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]	Year Ended December 31, 2019 2018 2017 (Dollars in thousands) Revenues from external customers attributable to: (1) United States $ 377,956 $ 328,606 $ 301,132 Indonesia — 4,379 28,968 Kenya 121,661 119,094 110,243 Turkey 88,938 168,699 125,166 Chile 25,540 980 8,895 Guatemala 28,624 27,975 27,991 New Zealand 31,222 10,451 33,395 Honduras 34,446 34,355 10,151 Other foreign countries 37,657 24,728 46,871 Consolidated total $ 746,044 $ 719,267 $ 692,812
Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block]	Year Ended December 31, 2019 2018 2017 (Dollars in thousands) Long-lived assets (primarily power plants and related assets) located in: United States $ 1,870,335 $ 1,696,439 $ 1,510,986 Kenya 284,526 301,956 340,970 Other foreign countries 224,676 222,872 281,333 Consolidated total $ 2,379,537 $ 2,221,267 $ 2,133,289
Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]	Year Ended December 31, 2019 2018 2017 Revenues % Revenues % Revenues % (Dollars in thousands) (Dollars in thousands) (Dollars in thousands) Southern California Public Power (1) $ 133,725 17.9 $ 109,208 15.2 $ 70,100 10.1 Sierra Pacific Power Company and Nevada Power Company (1)(2) 125,486 16.8 116,149 16.1 125,424 18.1 KPLC (1) 121,661 16.3 119,094 16.6 110,243 15.9

Note 21 - Employee Benefit Pl_2

Note 21 - Employee Benefit Plan (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Schedule of Expected Benefit Payments [Table Text Block]	(Dollars in thousands) Year ending December 31: 2020 $ 4,780 2021 1,434 2022 1,768 2023 89 2024 500 2025-2043 11,232 Total $ 19,803

Note 23 - Leases (Tables)

Note 23 - Leases (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Lease, Cost [Table Text Block]	Year Ended December 31, 2019 (Dollars in thousands) Lease cost Finance lease cost: Amortization of right-of-use assets $ 3,273 Interest on lease liabilities 1,330 Operating lease cost 8,057 Variable lease cost 1,647 Short-term lease cost — Total lease cost $ 14,307 Other information Cash paid for amounts included in the measurement of lease liabilities: Operating cash flows for finance leases $ 1,330 Operating cash flows for operating leases 9,004 Financing cash flows for finance leases 3,164 Right-of-use assets obtained in exchange for new finance lease liabilities 5,262 Right-of-use assets obtained in exchange for new operating lease liabilities 6,364 December 31, Additional information as of December 31, 2019: 2019 Weighted-average remaining lease term — finance leases (in years) 4.0 Weighted-average remaining lease term — operating leases (in years) 7.3 Weighted-average discount rate (in percentage) 5 %
Lessee, Lease Liability, Maturity [Table Text Block]	Operating Leases Finance Leases (Dollars in thousands) Year ending December 31, 2020 $ 2,742 $ 4,251 2021 2,701 3,948 2022 2,079 3,873 2023 1,524 2,758 2024 1,275 906 Thereafter 10,635 4,118 Total future minimum lease payments 20,956 19,854 Less imputed interest 4,205 5,577 Total $ 16,751 $ 14,277
Schedule of Future Minimum Rental Payments for Operating and Capital Leases [Table Text Block]	(Dollars in thousands) Year ending December 31, 2019 $ 10,889 2020 7,515 2021 5,758 2022 4,415 2023 2,910 Thereafter 9,292 Total $ 40,779
Operating Lease, Lease Income [Table Text Block]	Year Ended December 31, 2019 (Dollars in thousands) Lease income relating to lease payments of operating leases $ 479,059 Lease income relating to variable lease payments not included in the measurement of the lease — Total $ 479,059

Note 24 - Quarterly Financial_2

Note 24 - Quarterly Financial Information (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2019
Notes Tables
Quarterly Financial Information [Table Text Block]	Three Months Ended Mar. 31, 2018 June 30, 2018 Sept. 30, 2018 Dec. 31, 2018 Mar. 31, 2019 June 30, 2019 Sept. 30, 2019 Dec. 31, 2019 (Dollars in thousands, except per share amounts) Revenues: Electricity $ 132,489 $ 122,179 $ 116,891 $ 138,320 $ 142,908 $ 129,079 $ 123,978 $ 144,368 Product 48,672 54,915 48,439 49,717 52,128 52,030 43,037 43,814 Energy storage and management services 2,862 1,205 1,150 2,428 4,002 2,956 3,484 4,260 Total revenues 184,023 178,299 166,480 190,465 199,038 184,065 170,499 192,442 Cost of revenues: Electricity 73,482 81,236 79,845 63,692 77,543 73,775 80,124 81,393 Product 33,726 37,573 35,669 33,729 42,106 41,316 31,073 31,479 Energy storage and management services 3,443 2,028 2,174 2,235 5,210 3,827 3,807 5,068 Total cost of revenues 110,651 120,837 117,688 99,656 124,859 118,918 115,004 117,940 Gross profit 73,372 57,462 48,792 90,809 74,179 65,147 55,495 74,502 Operating expenses: Research and development expenses 1,108 1,251 706 1,118 900 810 1,062 1,875 Selling and marketing expenses 3,699 3,712 8,578 3,813 3,865 3,276 3,783 4,123 General and administrative expenses 13,849 15,866 13,606 4,429 15,689 14,181 11,931 14,032 Impairment charge — — — 13,464 — — — — Write-off of unsuccessful exploration activities 123 — — 3 — — — — Operating income 54,593 36,633 25,902 67,982 53,725 46,880 38,719 54,472 Other income (expense): Interest income 113 189 214 458 293 420 482 320 Interest expense, net (14,344 ) (15,846 ) (18,700 ) (22,034 ) (21,223 ) (21,517 ) (20,076 ) (17,568 ) Derivatives and foreign currency transaction gains (losses) (1,599 ) (529 ) (383 ) (2,250 ) 472 19 205 (72 ) Income attributable to sale of tax benefits 7,361 3,556 4,066 4,020 7,764 4,637 4,056 4,415 Other non-operating income (expense), net (20 ) 7,373 309 117 91 1,027 244 (482 ) Income from operations before income tax and equity in earnings (losses) of investees 46,104 31,376 11,408 48,293 41,122 31,466 23,630 41,085 Income tax (provision) 26,942 (29,105 ) (1,184 ) (31,386 ) (14,039 ) 3,529 (9,626 ) (25,477 ) Equity in earnings (losses) of investees, net 1,210 388 (117 ) 6,182 1,047 1,202 1,085 (1,481 ) Net income 74,256 2,659 10,107 23,089 28,130 36,197 15,089 14,127 Net loss (income) attributable to noncontrolling interest (4,748 ) (3,002 ) 474 (4,869 ) (2,184 ) (2,259 ) 516 (1,521 ) Net income (loss) attributable to the Company's stockholders $ 69,508 $ (343 ) $ 10,581 $ 18,220 $ 25,946 $ 33,938 $ 15,605 $ 12,606 Earnings (loss) per share attributable to the Company's stockholders Basic: Net income $ 1.37 $ (0.01 ) $ 0.21 $ 0.36 $ 0.51 $ 0.67 $ 0.31 $ 0.25 Diluted: Net income $ 1.36 $ (0.01 ) $ 0.21 $ 0.36 $ 0.51 $ 0.66 $ 0.30 $ 0.24 Weighted average number of shares used in computation of earnings per share attributable to the Company's stockholders: Basic 50,614 50,623 50,645 50,691 50,709 50,800 50,933 51,017 Diluted 51,051 50,958 50,963 50,936 51,012 51,094 51,334 51,511

Note 1 - Business and Signifi_3

Note 1 - Business and Significant Accounting Policies 1 (Details Textual) $ / shares in Units, $ in Thousands	May 03, 2018USD ($)	Mar. 15, 2017	Dec. 31, 2019USD ($)	Sep. 30, 2019USD ($)	Jun. 30, 2019USD ($)	Mar. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Sep. 30, 2018USD ($)	Jun. 30, 2018USD ($)	Mar. 31, 2018USD ($)	Dec. 31, 2019USD ($)$ / sharesshares	Dec. 31, 2018USD ($)$ / sharesshares	Dec. 31, 2017USD ($)$ / sharesshares
Dividends, Common Stock, Cash											$ 22,400	$ 26,800	$ 20,500
Common Stock, Dividends, Per Share, Declared | $ / shares											$ 0.44	$ 0.53	$ 0.44
Cash, FDIC Insured Amount			$ 12,900				$ 31,300				$ 12,900	$ 31,300
Cash, Uninsured Amount			84,800				93,900				84,800	93,900
Accounts Receivable, after Allowance for Credit Loss, Current, Total			154,525				137,581				154,525	137,581
Interest Costs Capitalized											3,285	3,728	$ 7,224
Exploration Abandonment and Impairment Expense			0	$ 0	$ 0	$ 0	3	$ 0	$ 0	$ 123	0	126	1,796
Accumulated Amortization, Debt Issuance Costs			19,500				21,800				19,500	21,800
Amortization of Debt Issuance Costs											5,400	4,600	5,700
Write off of Deferred Debt Issuance Cost											0	0	600
Impairment of Long-Lived Assets to be Disposed of											0
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax, Ending Balance			$ 1,500				0				1,500	0
Grants Received to Offset Exploration and Development Costs Incurred											$ 0	$ 0	$ 0
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares											360,500	176,400	42,900
Insured Event, Gain (Loss)											$ 0	$ 4,463	$ 0
Operating Lease, Weighted Average Discount Rate, Percent			5.00%								5.00%
Finance Lease, Weighted Average Discount Rate, Percent			7.00%								7.00%
Galena 2 Power Purchase Agreement [Member]
Termination Fees											$ 0	$ 5,000	$ 0
Product [Member]
Revenue, Remaining Performance Obligation, Amount			$ 139,300								$ 139,300
Viridity Energy, Inc. [Member]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		19 years									19 years
Minimum [Member]
Finite-Lived Intangible Asset, Useful Life											13 years
Maximum [Member]
Finite-Lived Intangible Asset, Useful Life											29 years
Power Plants [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life												15 years
Power Plants [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life												30 years
Puna Geothermal Power Plant [Member]
Insured Event, Gain (Loss)	$ 1,100										$ 9,300
Pacific Gas & Electric [Member]
Percentage of Total Revenue											1.50%	1.90%	2.00%
Kenya Power and Lighting Co LTD [Member]
Accounts Receivable, Past Due			$ 40,700								$ 40,700
Proceeds, Overdue Accounts Receivable											$ 24,200
Accounts Receivable, Past Due, Average Number of Days Overdue			70								70
Accounts Receivable, Past Due, Average Number of Days Overdue, Number of Days Increase During Period											10
ENNE [Member]
Accounts Receivable, Past Due			$ 20,100								$ 20,100
Accounts Receivable, Credit Loss Expense (Reversal)											$ 0
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Primary Customers [Member]
Concentration Risk, Percentage											58.00%	56.00%
Non-US [Member]
Accounts Receivable, after Allowance for Credit Loss, Current, Total			$ 118,800				$ 102,000				$ 118,800	$ 102,000

Note 1 - Business and Signifi_4

Note 1 - Business and Significant Accounting Policies 2 (Details Textual) - Product [Member] - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01	Dec. 31, 2019
Revenue, Remaining Performance Obligation, Percentage	100.00%
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period	24 months

Note 1 - Business and Signifi_5

Note 1 - Business and Significant Accounting Policies - Cash and Restricted Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Cash and cash equivalents	$ 71,173	$ 98,802	$ 47,818
Restricted cash and cash equivalents	81,937	78,693	48,825
Total cash and cash equivalents and restricted cash and cash equivalents	$ 153,110	$ 177,495	$ 96,643	$ 264,476

Note 1 - Business and Signifi_6

Note 1 - Business and Significant Accounting Policies - Property, Plant, and Equipment Estimated Useful Life (Details)	12 Months Ended
	Dec. 31, 2019
Building [Member]
Property, plant, and equipment estimated useful lives (Year)	25 years
Leasehold Improvements [Member] | Minimum [Member]
Property, plant, and equipment estimated useful lives (Year)	15 years
Leasehold Improvements [Member] | Maximum [Member]
Property, plant, and equipment estimated useful lives (Year)	20 years
Machinery And Equipment - Manufacturing And Drilling [Member]
Property, plant, and equipment estimated useful lives (Year)	10 years
Machinery and Equipment - Computers [Member] | Minimum [Member]
Property, plant, and equipment estimated useful lives (Year)	3 years
Machinery and Equipment - Computers [Member] | Maximum [Member]
Property, plant, and equipment estimated useful lives (Year)	5 years
Furniture and Fixtures [Member] | Minimum [Member]
Property, plant, and equipment estimated useful lives (Year)	5 years
Furniture and Fixtures [Member] | Maximum [Member]
Property, plant, and equipment estimated useful lives (Year)	15 years
Office Equipment - Other [Member] | Minimum [Member]
Property, plant, and equipment estimated useful lives (Year)	5 years
Office Equipment - Other [Member] | Maximum [Member]
Property, plant, and equipment estimated useful lives (Year)	10 years
Vehicles [Member] | Minimum [Member]
Property, plant, and equipment estimated useful lives (Year)	5 years
Vehicles [Member] | Maximum [Member]
Property, plant, and equipment estimated useful lives (Year)	7 years

Note 1 - Business and Signifi_7

Note 1 - Business and Significant Accounting Policies - Contract Assets (Liabilities) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018
Contract assets (*)	[1]	$ 38,365	$ 42,130
Contract liabilities (*)	[1]	(2,755)	(18,402)
Contract assets, net		35,610	23,728
Recognition of contract liabilities as revenue as a result of performance obligations satisfied		12,675	33,349
Cash received in advance for which revenues have not yet recognized, net of expenditures made		(3,323)	(38,162)
Reduction of contract assets as a result of rights to consideration becoming unconditional		(130,918)	(128,659)
Contract assets recognized, net of recognized receivables		133,448	136,496
Net change in contract assets and contract liabilities		2,530	7,837
Net change in contract assets and contract liabilities		$ 9,352	$ (4,813)
[1]	Contract assets and contract liabilities are presented as "Costs and estimated earnings in excess of billings on uncompleted contracts" and "Billings in excess of costs and estimated earnings on uncompleted contracts", respectively, on the consolidated balance sheets. The contract liabilities balance at the beginning of the year was fully recognized as product revenues during the years ended December 31, 2019 and 2018 as a result of performance obligations satisfied.

Note 1 - Business and Signifi_8

Note 1 - Business and Significant Accounting Policies - Impact of Adoption (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 01, 2019
Revenue	[1]									$ 746,044	$ 719,267	$ 692,812
Prepaid expenses and other		$ 12,667				$ 51,441				12,667	51,441		$ 16,056
Deferred financing and lease costs, net		0				3,242				0	3,242		1,583
Property, plant and equipment, net		1,971,415				1,959,578				1,971,415	1,959,578		1,946,723
Operating leases right of use		17,405				0				17,405	0		62,244
Finance leases right of use		14,161				0				14,161	0		13,476
Accounts payable and accrued expenses		141,857				116,362				141,857	116,362		113,502
Current maturity of operating lease liabilities		2,743				0				2,743	0		7,532
Current maturity of finance lease liabilities		3,068				0				3,068	0		2,841
Other long-term liabilities		6,838				16,087				6,838	16,087		6,117
Long term portion of operating lease liabilities		14,008				0				14,008	0		17,668
Long term portion of finance lease liabilities		11,209				0				11,209	0		10,668
Retained earnings		487,873				422,222				487,873	422,222		422,164
Accounting Standards Update 2016-02 [Member]
Prepaid expenses and other													(35,385)
Deferred financing and lease costs, net													(1,659)
Property, plant and equipment, net													(12,855)
Operating leases right of use													62,244
Finance leases right of use													13,476
Accounts payable and accrued expenses													(2,860)
Current maturity of operating lease liabilities													7,532
Current maturity of finance lease liabilities													2,841
Other long-term liabilities													(9,970)
Long term portion of operating lease liabilities													17,668
Long term portion of finance lease liabilities													10,668
Retained earnings													$ (58)
Electricity [Member]
Revenue		$ 144,368	$ 123,978	$ 129,079	$ 142,908	$ 138,320	$ 116,891	$ 122,179	$ 132,489	540,333	509,879	$ 465,593
Electricity [Member] | Accounting Standards Update 2016-02 [Member]
Revenue										479,059	481,619
Electricity and Product Revenue [Member] | Accounting Standards Update 2014-09 [Member]
Revenue										$ 266,985	$ 237,648
[1]	Revenues as reported in the geographic area in which they originate.

Note 1 - Business and Signifi_9

Note 1 - Business and Significant Accounting Policies - Shares Used to Calculate Earnings Per Share (Details) - shares shares in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Weighted average number of shares used in computation of basic earnings per share (in shares)	51,017	50,933	50,800	50,709	50,691	50,645	50,623	50,614	50,867	50,643	50,110
Additional shares from the assumed exercise of employee stock options (in shares)									360	326	659
Weighted average number of shares used in computation of diluted earnings per share (in shares)	51,511	51,334	51,094	51,012	50,936	50,963	50,958	51,051	51,227	50,969	50,769

Note 1 - Business and Signif_10

Note 1 - Business and Significant Accounting Policies - Redeemable Noncontrolling Interest (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Redeemable noncontrolling interest as of January 1,	$ 8,603	$ 6,416
Redeemable noncontrolling interest in results of operation of a consolidated subsidiary	1,132	990
Cash paid to noncontrolling interest	(252)	0
Increase in share of redeemable noncontrolling interest	0	1,528
Currency translation adjustments	(233)	(331)
Redeemable noncontrolling interest as of December 31,	$ 9,250	$ 8,603

Note 1 - Business and Signif_11

Note 1 - Business and Significant Accounting Policies - ROU Assets Useful Life (Details)	12 Months Ended
	Dec. 31, 2019
Automobiles [Member] | ROA Asset [Member]
Property, plant, and equipment estimated useful lives (Year)	5 years
Building [Member]
Property, plant, and equipment estimated useful lives (Year)	25 years
Building [Member] | ROA Asset [Member]
Property, plant, and equipment estimated useful lives (Year)	15 years
Minimum [Member] | Land [Member] | ROA Asset [Member]
Property, plant, and equipment estimated useful lives (Year)	1 year
Maximum [Member] | Land [Member] | ROA Asset [Member]
Property, plant, and equipment estimated useful lives (Year)	35 years

Note 2 - Business Acquisition_3

Note 2 - Business Acquisitions and Others (Details Textual) $ in Thousands		Jul. 02, 2019USD ($)	Apr. 24, 2018USD ($)MWh	Mar. 15, 2017USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Payments to Acquire Equity Method Investments						$ 10,674	$ 3,800	$ 46,318
Goodwill, Ending Balance					$ 20,140	$ 20,140	19,950	21,037
U.S. Geothermal [Member]
Payments to Acquire Businesses, Gross			$ 110,000
Current Power Generation | MWh			38
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual							21,400
Business Acquisition, Pro Forma Operating Income (Loss) since Acquisition Date, Actual							2,500
Business Combination, Consideration Transferred, Total			$ 110,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total	[1]		127,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Working Capital			(8,200)
Goodwill, Ending Balance	[2]		$ 12,700
U.S. Geothermal [Member] | Long-term Electricity Power Purchase Agreements [Member]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			19 years
Viridity Energy, Inc. [Member]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life				19 years		19 years
Business Combination, Consideration Transferred, Total				$ 35,300
Business Combination, Contingent Consideration, Liability, Total				12,400			$ 10,300	$ 600
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total				34,700
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Working Capital				400
Goodwill, Ending Balance				$ 13,500
Neal Hot Springs [Member] | U.S. Geothermal [Member]
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value			$ 34,900
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Percent			40.00%
Neal Hot Springs [Member] | U.S. Geothermal [Member] | Measurement Input, Expected Term [Member]
Noncontrolling Interest, Measurement Input			20
Neal Hot Springs [Member] | U.S. Geothermal [Member] | Measurement Input, Discount Rate [Member]
Noncontrolling Interest, Measurement Input			0.09
Subsidiary of Medco Power [Member] | Ijen Geothermal Project Company [Member]
Ownership Percentage Of Common Shares Outstanding		51.00%
Ormat Nevada Inc. [Member] | U.S. Geothermal [Member]
Payments to Acquire Businesses, Gross			$ 106,000
Heit vs Ormat Technologies, Inc. [Member] | U.S. Geothermal [Member]
Payments to Acquire Businesses, Gross			$ 4,000
Ijen Geothermal Project Company [Member]
Equity Method Investment, Ownership Percentage		49.00%
Payments to Acquire Equity Method Investments		$ 2,700			$ 7,400
[1]	Intangible assets are primarily related to long-term electricity power purchase agreements and depreciated over an average of 19 years.
[2]	Goodwill is primarily related to the expected synergies in operations as a result of the purchase transaction. The goodwill is allocated to the Electricity segment and not deductible for tax purposes.

Note 2 - Business Acquisition_4

Note 2 - Business Acquisitions and Others - Fair Value of Amounts of Identified Assets and Liabilities Assumed in a Business Combination (Details) - USD ($) $ in Thousands		Dec. 31, 2019	Dec. 31, 2018	Apr. 24, 2018	Dec. 31, 2017
Goodwill (2)		$ 20,140	$ 19,950		$ 21,037
U.S. Geothermal [Member]
Cash and cash equivalents and restricted cash				$ 37,900
Property, plant and equipment and construction-in-process				77,300
Intangible assets (1)	[1]			127,000
Goodwill (2)	[2]			12,700
Deferred taxes				1,700
Total assets acquired				256,600
Other working capital				(8,200)
Long-term term debt				(98,300)
Asset retirement obligation				(9,000)
Noncontrolling interest				(34,900)
Total liabilities assumed				(150,400)
Total assets acquired, and liabilities assumed, net				$ 106,200
[1]	Intangible assets are primarily related to long-term electricity power purchase agreements and depreciated over an average of 19 years.
[2]	Goodwill is primarily related to the expected synergies in operations as a result of the purchase transaction. The goodwill is allocated to the Electricity segment and not deductible for tax purposes.

Note 2 - Business Acquisition_5

Note 2 - Business Acquisitions and Others - Summary of Pro Forma Information Related to a Business Combination (Details) - U.S. Geothermal [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Business Acquisition, Pro Forma Revenue	$ 730,563	$ 724,869
Income from continuing operations before income taxes and equity in losses of investees	134,142	169,546
Electricity Segment [Member]
Business Acquisition, Pro Forma Revenue	$ 521,175	$ 497,650

Note 3 - Inventories - Inventor

Note 3 - Inventories - Inventories, Current (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Raw materials and purchased parts for assembly	$ 21,942	$ 26,914
Self-manufactured assembly parts and finished products	13,007	18,110
Total	$ 34,949	$ 45,024

Note 4 - Cost and Estimated E_3

Note 4 - Cost and Estimated Earnings on Uncompleted Contracts - Cost and Estimated Earnings on Uncompleted Contracts (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Costs and estimated earnings incurred on uncompleted contracts	$ 196,550	$ 278,797
Less billings to date	(160,940)	(255,069)
Total	$ 35,610	$ 23,728

Note 4 - Cost and Estimated E_4

Note 4 - Cost and Estimated Earnings on Uncompleted Contracts - Cost and Estimated Earnings on Uncompleted Contracts Included in Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Costs and estimated earnings in excess of billings on uncompleted contracts	$ 38,365	$ 42,130
Billings in excess of costs and estimated earnings on uncompleted contracts	(2,755)	(18,402)
Total	$ 35,610	$ 23,728

Note 5 - Investment in an Unc_3

Note 5 - Investment in an Unconsolidated Company (Details Textual) - Sarulla [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)MWh	Dec. 31, 2018USD ($)
Jointly Owned Utility Plant, Proportionate Ownership Share	12.75%
Expected Power Generating Capacity | MWh	330
Number of Phases of Construction	3
Power Utilization | MWh	110
Power Plant Usage Agreement Term	30 years
Payments to Acquire Projects	$ 0	$ 3,800
Accumulated Cash Contributions to Acquire Projects	62,000
Interest Rate Swap [Member]
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax, Ending Balance	$ 6,300	$ 2,900

Note 5 - Investment in an Unc_4

Note 5 - Investment in an Unconsolidated Company - Unconsolidated Investments Mainly in Power Plants (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Total investment in unconsolidated companies	$ 81,140	$ 71,983
Sarulla [Member]
Total investment in unconsolidated companies	70,589	71,983
Ijen Geothermal Project Company [Member]
Total investment in unconsolidated companies	$ 10,551	$ 0

Note 5 - Investment in an Unc_5

Note 5 - Investment in an Unconsolidated Company - Unrealized Gain (Loss) on Derivative Instruments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Interest Rate Swap [Member] | Sarulla [Member]
Change, net of deferred tax, in unrealized gains (losses) in respect of the Company’s share in derivative instruments of unconsolidated investment	$ (3,417)	$ 2,235

Note 6 - Variable Interest En_3

Note 6 - Variable Interest Entities - Assets and Liabilities for the Company's 2015 Variable Interest Entity (Details) - USD ($) $ in Thousands		Dec. 31, 2019		Jan. 01, 2019	Dec. 31, 2018		Dec. 31, 2017
Restricted cash and cash equivalents (primarily related to VIEs)		$ 81,937			$ 78,693
Property, plant and equipment, net		1,971,415			1,959,578
Construction-in-process		376,555			261,690
Total assets	[1]	3,250,494	[2]		3,121,350	[3]	$ 2,623,864	[3]
Accounts payable and accrued expenses		141,857		$ 113,502	116,362
Long-term debt		1,167,912
Other long-term liabilities		6,838		6,117	16,087
Total liabilities		1,725,834			1,667,651
Assets:
Restricted cash and cash equivalents		81,937			78,693		48,825
Property, plant and equipment, net		1,971,415			1,959,578
Construction-in-process		376,555			261,690
Total assets	[1]	3,250,494	[2]		3,121,350	[3]	$ 2,623,864	[3]
Liabilities:
Accounts payable and accrued expenses		141,857		113,502	116,362
Long-term debt		1,167,912
Other long-term liabilities		6,838		$ 6,117	16,087
Total liabilities		1,725,834			1,667,651
Variable Interest Entity [Member]
Construction-in-process		149,830			104,085
Assets:
Construction-in-process		149,830			104,085
Variable Interest Entity [Member] | Project Debt [Member]
Restricted cash and cash equivalents (primarily related to VIEs)		81,522
Other current assets					213,007
Property, plant and equipment, net		1,211,656			1,552,408
Construction-in-process		10,188			90,812
Other long-term assets		162,995			177,723
Total assets		1,630,747			2,109,969
Accounts payable and accrued expenses		25,361			24,245
Long-term debt		794,214			805,850
Other long-term liabilities		126,851			125,769
Total liabilities		946,426			955,864
Assets:
Restricted cash and cash equivalents					76,019
Other current assets					213,007
Property, plant and equipment, net		1,211,656			1,552,408
Construction-in-process		10,188			90,812
Other long-term assets		162,995			177,723
Total assets		1,630,747			2,109,969
Liabilities:
Accounts payable and accrued expenses		25,361			24,245
Long-term debt		794,214			805,850
Other long-term liabilities		126,851			125,769
Total liabilities		946,426			955,864
Variable Interest Entity [Member] | Power Purchase Agreement [Member]
Restricted cash and cash equivalents (primarily related to VIEs)		20
Other current assets		29,076
Assets:
Other current assets		29,076
Variable Interest Entity [Member] | Power Purchase Agreements [Member]
Other current assets					9,698
Property, plant and equipment, net		668,891			306,820
Construction-in-process		139,642			13,273
Other long-term assets		40,138			9,104
Total assets		877,767			341,199
Accounts payable and accrued expenses		13,201			2,651
Long-term debt		0			0
Other long-term liabilities		32,790			12,483
Total liabilities		45,991			15,134
Assets:
Restricted cash and cash equivalents					2,304
Other current assets					9,698
Property, plant and equipment, net		668,891			306,820
Construction-in-process		139,642			13,273
Other long-term assets		40,138			9,104
Total assets		877,767			341,199
Liabilities:
Accounts payable and accrued expenses		13,201			2,651
Long-term debt		0			0
Other long-term liabilities		32,790			12,483
Total liabilities		45,991			$ 15,134
Variable Interest Entity [Member] | Projected [Member]
Other current assets		164,386
Assets:
Other current assets		$ 164,386
[1]	Electricity segment assets include goodwill in the amount of $20.1 million, $20.0 million and $7.6 as of December 31, 2019, 2018 and 2017, respectively. No goodwill is included in the Product and Energy Storage and Management Services segment assets as of December 31, 2019 and 2018. Energy Storage and Management Services segment assets as December 31, 2017 include goodwill in the amount of $13.5 million. For further information on goodwill, see Note 9 - Intangible assets and goodwill to the consolidated financial statements.
[2]	Including unconsolidated investments 81,140 — — 81,140
[3]	Including unconsolidated investments 34,084 — — 34,084

Note 7 - Fair Value of Financ_3

Note 7 - Fair Value of Financial Instruments (Details Textual) - Henry Hub Natural Gas Future ("NG") Contracts [Member] - Put Option [Member] $ in Millions	Jan. 12, 2017USD ($)MMBTU$ / BTU
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU	4.1
Derivative, Price Risk Option Strike Price | $ / BTU	3
Payments for Derivative Instrument, Investing Activities | $	$ 0.7

Note 7 - Fair Value of Financ_4

Note 7 - Fair Value of Financial Instruments - Financial Assets and Liabilities at Fair Value (Details) - USD ($) $ in Thousands		Dec. 31, 2019	Dec. 31, 2018
Reported Value Measurement [Member]
Cash equivalents (including restricted cash accounts)		$ 28,316	$ 18,787
		25,421	14,427
Cash equivalents (including restricted cash accounts)		28,316	18,787
Reported Value Measurement [Member] | Contingent Receivable [Member]
Derivative Asset, Current	[1]	102	104
Reported Value Measurement [Member] | Currency Forward Contracts [Member]
Derivative Asset, Current	[2]	362
Derivative Liability, Current	[2]		(1,040)
Reported Value Measurement [Member] | Contingent Payable [Member]
Derivative Liability, Current	[1]	(3,359)	(3,424)
Estimate of Fair Value Measurement [Member]
Cash equivalents (including restricted cash accounts)		28,316	18,787
		25,421	14,427
Cash equivalents (including restricted cash accounts)		28,316	18,787
Estimate of Fair Value Measurement [Member] | Contingent Receivable [Member]
Derivative Asset, Current	[1]	102	104
Estimate of Fair Value Measurement [Member] | Currency Forward Contracts [Member]
Derivative Asset, Current	[2]	362
Derivative Liability, Current	[2]		(1,040)
Estimate of Fair Value Measurement [Member] | Contingent Payable [Member]
Derivative Liability, Current	[1]	(3,359)	(3,424)
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Cash equivalents (including restricted cash accounts)		28,316	18,787
		28,316	18,787
Cash equivalents (including restricted cash accounts)		28,316	18,787
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Contingent Receivable [Member]
Derivative Asset, Current	[1]	0	0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Currency Forward Contracts [Member]
Derivative Asset, Current	[2]	0
Derivative Liability, Current	[2]		0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Contingent Payable [Member]
Derivative Liability, Current	[1]	0	0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Cash equivalents (including restricted cash accounts)		0	0
		362	(1,040)
Cash equivalents (including restricted cash accounts)		0	0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Contingent Receivable [Member]
Derivative Asset, Current	[1]	0	0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Currency Forward Contracts [Member]
Derivative Asset, Current	[2]	362
Derivative Liability, Current	[2]		(1,040)
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Contingent Payable [Member]
Derivative Liability, Current	[1]	0	0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Cash equivalents (including restricted cash accounts)		0	0
		(3,257)	(3,320)
Cash equivalents (including restricted cash accounts)		0	0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Contingent Receivable [Member]
Derivative Asset, Current	[1]	102	104
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Currency Forward Contracts [Member]
Derivative Asset, Current	[2]	0
Derivative Liability, Current	[2]		0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Contingent Payable [Member]
Derivative Liability, Current	[1]	$ (3,359)	$ (3,424)
[1]	These amounts relate to contingent receivables and payables and warrants pertaining to the Guadeloupe power plant purchase transaction, valued primarily based on unobservable inputs and are included within "Prepaid expenses and other", "Accounts payable and accrued expenses" and "Other long-term liabilities" on December 31, 2019 and 2018 in the consolidated balance sheets with the corresponding gain or loss being recognized within "Derivatives and foreign currency transaction gains (losses)" in the consolidated statement of operations and comprehensive income.
[2]	These amounts relate to currency forward contracts valued primarily based on observable inputs, including forward and spot prices for currencies, net of contracted rates and then multiplied by notional amounts, and are included within "Receivables, other" and "Accounts payable and accrued expenses", as applicable, on December 31, 2019 and December 31, 2018, in the consolidated balance sheet with the corresponding gain or loss being recognized within "Derivatives and foreign currency transaction gains (losses)" in the consolidated statement of operations and comprehensive income.

Note 7 - Fair Value of Financ_5

Note 7 - Fair Value of Financial Instruments - Amounts of Gain (Loss) Recognized in Condensed Consolidated Statements on Derivative Instruments Not Designated as Hedges (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Amount of gain (loss) recognized	$ 2,556	$ 7,411	$ 5,268
Foreign Currency Gain (Loss) [Member] | Put Options on Natural Gas Price [Member]
Amount of gain (loss) recognized	0	0	(350)
Foreign Currency Gain (Loss) [Member] | Contingent Considerations [Member]
Amount of gain (loss) recognized	0	170	(129)
Foreign Currency Gain (Loss) [Member] | Currency Forward Contracts [Member]
Amount of gain (loss) recognized	2,556	(3,081)	3,699
General and Administrative Expense [Member] | Currency Forward Contracts [Member]
Amount of gain (loss) recognized	$ 0	$ 10,322	$ 2,048

Note 7 - Fair Value of Financ_6

Note 7 - Fair Value of Financial Instruments - Fair Value of Long-term Debt Approximates Its Carrying Amount, Exceptions (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Estimate of Fair Value Measurement [Member]
Other long-term debt	$ 16.3	$ 5.4
Reported Value Measurement [Member]
Other long-term debt	17.4	6.2
Olkaria III OPIC [Member]
Loans	202.1	211.8
Olkaria III OPIC [Member] | Estimate of Fair Value Measurement [Member]
Loans	202.1	211.8
Olkaria III OPIC [Member] | Reported Value Measurement [Member]
Loans	192.6	210.6
Olkaria III Plant 4 Loan - DEG 2 [Member]
Loans	43.8
Olkaria III Plant 4 Loan - DEG 2 [Member] | Estimate of Fair Value Measurement [Member]
Loans	43.8	47.2
Olkaria III Plant 4 Loan - DEG 2 [Member] | Reported Value Measurement [Member]
Loans	42.5	47.5
Olkaria III plant 1 Loan - DEG 3 [Member]
Loans	38.8
Olkaria III plant 1 Loan - DEG 3 [Member] | Estimate of Fair Value Measurement [Member]
Loans	38.8	0
Olkaria III plant 1 Loan - DEG 3 [Member] | Reported Value Measurement [Member]
Loans	37.1	0
Platanares Loan - OPIC [Member]
Loans	115.3	119.1
Platanares Loan - OPIC [Member] | Estimate of Fair Value Measurement [Member]
Loans	115.3	119.1
Platanares Loan - OPIC [Member] | Reported Value Measurement [Member]
Loans	104.5	112.7
Amatitlan Loan [Member]
Loans	26.4	29.9
Amatitlan Loan [Member] | Estimate of Fair Value Measurement [Member]
Loans	26.4	29.9
Amatitlan Loan [Member] | Reported Value Measurement [Member]
Loans	26.3	29.8
OrCal Geothermal Inc [Member]
Notes		19
OrCal Geothermal Inc [Member] | Estimate of Fair Value Measurement [Member]
Notes	0	19
OrCal Geothermal Inc [Member] | Reported Value Measurement [Member]
Notes	0	18.7
OFC Two Senior Secured Notes [Member] | Estimate of Fair Value Measurement [Member]
Notes	210.9	214.5
OFC Two Senior Secured Notes [Member] | Reported Value Measurement [Member]
Notes	203	217.8
Don A. Campbell 1 ("DAC1") [Member]
Notes	78.5	78.8
Don A. Campbell 1 ("DAC1") [Member] | Estimate of Fair Value Measurement [Member]
Notes	78.5	78.8
Don A. Campbell 1 ("DAC1") [Member] | Reported Value Measurement [Member]
Notes	78.2	83.3
USG Prudential - NV [Member]
Notes	30.6	29.4
USG Prudential - NV [Member] | Estimate of Fair Value Measurement [Member]
Notes	30.6	29.4
USG Prudential - NV [Member] | Reported Value Measurement [Member]
Notes	28.4	27.8
USG Prudential - ID [Member]
Notes	18.6	18.6
USG Prudential - ID [Member] | Estimate of Fair Value Measurement [Member]
Notes	18.6	18.6
USG Prudential - ID [Member] | Reported Value Measurement [Member]
Notes	19.6	18.9
USG DOE [Member]
Notes	45	48.3
USG DOE [Member] | Estimate of Fair Value Measurement [Member]
Notes	45	48.3
USG DOE [Member] | Reported Value Measurement [Member]
Notes	40.8	51.4
Senior Unsecured Bonds [Member]
Senior Unsecured debt	205.7	199.4
Senior Unsecured Bonds [Member] | Estimate of Fair Value Measurement [Member]
Senior Unsecured debt	205.7	199.4
Senior Unsecured Bonds [Member] | Reported Value Measurement [Member]
Senior Unsecured debt	204.3	204.3
Senior Unsecured Loan [Member]
Senior Unsecured debt	161.3	102.2
Senior Unsecured Loan [Member] | Estimate of Fair Value Measurement [Member]
Senior Unsecured debt	161.3	102.2
Senior Unsecured Loan [Member] | Reported Value Measurement [Member]
Senior Unsecured debt	150	100
Plumstriker Loan Agreement [Member]
Loans	21.7
Plumstriker Loan Agreement [Member] | Estimate of Fair Value Measurement [Member]
Loans	21.7	0
Plumstriker Loan Agreement [Member] | Reported Value Measurement [Member]
Loans	$ 21.6	$ 0

Note 7 - Fair Value of Financ_7

Note 7 - Fair Value of Financial Instruments - Fair Value of Financial Instruments (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Revolving lines of credit	$ 40.6	$ 159
Deposits	12.2	12
Commercial Paper [Member]
Commercial paper	50
Olkaria III OPIC [Member]
Loans	202.1	211.8
Olkaria III Plant 4 Loan - DEG 2 [Member]
Loans	43.8
Olkaria III plant 1 Loan - DEG 3 [Member]
Loans	38.8
Platanares Loan - OPIC [Member]
Loans	115.3	119.1
Amatitlan Loan [Member]
Loans	26.4	29.9
OrCal Geothermal Inc [Member]
Notes		19
OFC Senior Secured Notes [Member]
Notes	210.9	214.5
Don A. Campbell 1 ("DAC1") [Member]
Notes	78.5	78.8
USG Prudential - NV [Member]
Notes	30.6	29.4
USG Prudential - ID [Member]
Notes	18.6	18.6
USG DOE [Member]
Notes	45	48.3
Senior Unsecured Bonds [Member]
Senior Unsecured debt	205.7	199.4
Senior Unsecured Loan [Member]
Senior Unsecured debt	161.3	102.2
Plumstriker Loan Agreement [Member]
Loans	21.7
Other Long-term Debt [Member]
Senior Unsecured debt	16.3	5.4
Fair Value, Inputs, Level 1 [Member]
Revolving lines of credit	0	0
Deposits	12.2	12
Fair Value, Inputs, Level 1 [Member] | Commercial Paper [Member]
Commercial paper	0
Fair Value, Inputs, Level 1 [Member] | Olkaria III OPIC [Member]
Loans	0	0
Fair Value, Inputs, Level 1 [Member] | Olkaria III Plant 4 Loan - DEG 2 [Member]
Loans	0	0
Fair Value, Inputs, Level 1 [Member] | Olkaria III plant 1 Loan - DEG 3 [Member]
Loans	0
Fair Value, Inputs, Level 1 [Member] | Platanares Loan - OPIC [Member]
Loans	0	0
Fair Value, Inputs, Level 1 [Member] | Amatitlan Loan [Member]
Loans	0	0
Fair Value, Inputs, Level 1 [Member] | OrCal Geothermal Inc [Member]
Notes		0
Fair Value, Inputs, Level 1 [Member] | OFC Senior Secured Notes [Member]
Notes	0	0
Fair Value, Inputs, Level 1 [Member] | Don A. Campbell 1 ("DAC1") [Member]
Notes	0	0
Fair Value, Inputs, Level 1 [Member] | USG Prudential - NV [Member]
Notes	0	0
Fair Value, Inputs, Level 1 [Member] | USG Prudential - ID [Member]
Notes	0	0
Fair Value, Inputs, Level 1 [Member] | USG DOE [Member]
Notes	0	0
Fair Value, Inputs, Level 1 [Member] | Senior Unsecured Bonds [Member]
Senior Unsecured debt	0	0
Fair Value, Inputs, Level 1 [Member] | Senior Unsecured Loan [Member]
Senior Unsecured debt	0	0
Fair Value, Inputs, Level 1 [Member] | Plumstriker Loan Agreement [Member]
Loans	0
Fair Value, Inputs, Level 1 [Member] | Other Long-term Debt [Member]
Senior Unsecured debt	0	0
Fair Value, Inputs, Level 2 [Member]
Revolving lines of credit	40.6	159
Deposits	0	0
Fair Value, Inputs, Level 2 [Member] | Commercial Paper [Member]
Commercial paper	50
Fair Value, Inputs, Level 2 [Member] | Olkaria III OPIC [Member]
Loans	0	0
Fair Value, Inputs, Level 2 [Member] | Olkaria III Plant 4 Loan - DEG 2 [Member]
Loans	0	0
Fair Value, Inputs, Level 2 [Member] | Olkaria III plant 1 Loan - DEG 3 [Member]
Loans	0
Fair Value, Inputs, Level 2 [Member] | Platanares Loan - OPIC [Member]
Loans	0	0
Fair Value, Inputs, Level 2 [Member] | Amatitlan Loan [Member]
Loans	26.4	29.9
Fair Value, Inputs, Level 2 [Member] | OrCal Geothermal Inc [Member]
Notes		0
Fair Value, Inputs, Level 2 [Member] | OFC Senior Secured Notes [Member]
Notes	0	0
Fair Value, Inputs, Level 2 [Member] | Don A. Campbell 1 ("DAC1") [Member]
Notes	0	0
Fair Value, Inputs, Level 2 [Member] | USG Prudential - NV [Member]
Notes	0	0
Fair Value, Inputs, Level 2 [Member] | USG Prudential - ID [Member]
Notes	0	0
Fair Value, Inputs, Level 2 [Member] | USG DOE [Member]
Notes	0	0
Fair Value, Inputs, Level 2 [Member] | Senior Unsecured Bonds [Member]
Senior Unsecured debt	0	0
Fair Value, Inputs, Level 2 [Member] | Senior Unsecured Loan [Member]
Senior Unsecured debt	0	0
Fair Value, Inputs, Level 2 [Member] | Plumstriker Loan Agreement [Member]
Loans	21.7
Fair Value, Inputs, Level 2 [Member] | Other Long-term Debt [Member]
Senior Unsecured debt	0	0
Fair Value, Inputs, Level 3 [Member]
Revolving lines of credit	0	0
Deposits	0	0
Fair Value, Inputs, Level 3 [Member] | Commercial Paper [Member]
Commercial paper	0
Fair Value, Inputs, Level 3 [Member] | Olkaria III OPIC [Member]
Loans	202.1	211.8
Fair Value, Inputs, Level 3 [Member] | Olkaria III Plant 4 Loan - DEG 2 [Member]
Loans	43.8	47.2
Fair Value, Inputs, Level 3 [Member] | Olkaria III plant 1 Loan - DEG 3 [Member]
Loans	38.8
Fair Value, Inputs, Level 3 [Member] | Platanares Loan - OPIC [Member]
Loans	115.3	119.1
Fair Value, Inputs, Level 3 [Member] | Amatitlan Loan [Member]
Loans	0	0
Fair Value, Inputs, Level 3 [Member] | OrCal Geothermal Inc [Member]
Notes		19
Fair Value, Inputs, Level 3 [Member] | OFC Senior Secured Notes [Member]
Notes	210.9	214.5
Fair Value, Inputs, Level 3 [Member] | Don A. Campbell 1 ("DAC1") [Member]
Notes	78.5	78.8
Fair Value, Inputs, Level 3 [Member] | USG Prudential - NV [Member]
Notes	30.6	29.4
Fair Value, Inputs, Level 3 [Member] | USG Prudential - ID [Member]
Notes	18.6	18.6
Fair Value, Inputs, Level 3 [Member] | USG DOE [Member]
Notes	45	48.3
Fair Value, Inputs, Level 3 [Member] | Senior Unsecured Bonds [Member]
Senior Unsecured debt	205.7	199.4
Fair Value, Inputs, Level 3 [Member] | Senior Unsecured Loan [Member]
Senior Unsecured debt	161.3	102.2
Fair Value, Inputs, Level 3 [Member] | Plumstriker Loan Agreement [Member]
Loans	0
Fair Value, Inputs, Level 3 [Member] | Other Long-term Debt [Member]
Senior Unsecured debt	$ 16.3	$ 5.4

Note 8 - Property, Plant and _3

Note 8 - Property, Plant and Equipment and Construction-in-process (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Jan. 22, 2014
Depreciation, Total	$ 126.7	$ 114.4	$ 98.8
Depreciation Net Of Amortization Of Cash Grant	7.3	6.4	$ 5.5
Property, Plant and Equipment Including Construction In Progress, Net	1,841.4	1,696.4
Property, Plant and Equipment, Cash Grant, Net	162.3	179.7
Geotermica Platanares [Member]
Property, Plant and Equipment Including Construction In Progress, Net	$ 96.1	105.7
Power Plant Usage Agreement Term	15 years
Geothermie Bouillante SA (“GB”) [Member]
Property, Plant and Equipment Including Construction In Progress, Net	$ 24.5	23.9
Orzunil I de Electricidad, Limitada [Member]
Property, Plant and Equipment Including Construction In Progress, Net	10.3	14.6
Ortitlan Limitada [Member]
Property, Plant and Equipment Including Construction In Progress, Net	$ 42.8	43.5
Kenya Power and Lighting Co Limited [Member]
Power Purchase Agreements Term	20 years
Zunil Power Plant In Guatemala [Member] | Instituto Nacional de Electrificacion (INDE) [Member] | Orzunil I de Electricidad, Limitada [Member]
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners				3.00%
ENEE [Member] | Geotermica Platanares [Member]
Power Plant Usage Agreement Term	30 years
EDF [Member] | Geothermie Bouillante SA (“GB”) [Member]
Power Purchase Agreements Term	15 years
Foreign Countries [Member]
Property, Plant and Equipment Including Construction In Progress, Net	$ 506.6	524.8
KENYA | Power Plants [Member]
Property, Plant and Equipment Including Construction In Progress, Net	$ 284.5	$ 302

Note 8 - Property, Plant and _4

Note 8 - Property, Plant and Equipment and Construction-in-process - Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Property, plant and equipment	$ 3,225,949	$ 3,097,806
Asset retirement cost	19,824	11,448
Less accumulated depreciation	(1,254,534)	(1,138,228)
Property, plant and equipment, net	1,971,415	1,959,578
Land [Member]
Property, plant and equipment	38,049	38,060
Leasehold Improvements [Member]
Property, plant and equipment	7,757	5,718
Machinery and Equipment [Member]
Property, plant and equipment	230,465	208,646
Office Equipment [Member]
Property, plant and equipment	39,099	35,708
Vehicles [Member]
Property, plant and equipment	8,021	22,074
Geothermal And Recovered Energy Generation Power Plants [Member] | UNITED STATES
Property, plant and equipment	2,160,910	2,065,377
Geothermal And Recovered Energy Generation Power Plants [Member] | Foreign Countries [Member]
Property, plant and equipment	$ 721,824	$ 710,775

Note 8 - Property, Plant and _5

Note 8 - Property, Plant and Equipment and Construction-in-process - Construction-in-process (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Construction-in-process	$ 376,555	$ 261,690
Projects Under Exploration and Development [Member]
Construction-in-process	84,637	70,958	$ 63,875	$ 54,447
Projects Under Exploration and Development [Member] | Up-front Bonus Lease Costs [Member]
Construction-in-process	17,018	17,018	17,018	17,385
Projects Under Exploration and Development [Member] | Exploration and Development Costs [Member]
Construction-in-process	66,916	53,237	46,154	36,359
Projects Under Exploration and Development [Member] | Interest Capitalized [Member]
Construction-in-process	703	703	$ 703	$ 703
Projects Under Construction [Member]
Construction-in-process	291,918	190,732
Projects Under Construction [Member] | Up-front Bonus Lease Costs [Member]
Construction-in-process	27,473	27,473
Projects Under Construction [Member] | Interest Capitalized [Member]
Construction-in-process	5,961	2,861
Projects Under Construction [Member] | Drilling And Construction Costs [Member]
Construction-in-process	$ 258,484	$ 160,398

Note 8 - Property, Plant and _6

Note 8 - Property, Plant and Equipment and Construction-in-process - Activity in Construction and Development (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Balance				$ 261,690					$ 261,690
Write off of unsuccessful exploration costs	$ 0	$ 0	$ 0	0	$ (3)	$ 0	$ 0	$ (123)	0	$ (126)	$ (1,796)
Balance	376,555				261,690				376,555	261,690
Projects Under Exploration and Development [Member]
Balance				70,958				63,875	70,958	63,875	54,447
Cost incurred during the year									17,215	7,209	11,224
Write off of unsuccessful exploration costs										(126)	(1,796)
Transfer of projects under exploration and development to projects under construction									(3,536)
Balance	84,637				70,958				84,637	70,958	63,875
Projects Under Exploration and Development [Member] | Up-front Bonus Lease Costs [Member]
Balance				17,018				17,018	17,018	17,018	17,385
Cost incurred during the year									0	0	0
Write off of unsuccessful exploration costs										0	(367)
Transfer of projects under exploration and development to projects under construction									0
Balance	17,018				17,018				17,018	17,018	17,018
Projects Under Exploration and Development [Member] | Exploration and Development Costs [Member]
Balance				53,237				46,154	53,237	46,154	36,359
Cost incurred during the year									17,215	7,209	11,224
Write off of unsuccessful exploration costs										(126)	(1,429)
Transfer of projects under exploration and development to projects under construction									(3,536)
Balance	66,916				53,237				66,916	53,237	46,154
Projects Under Exploration and Development [Member] | Interest Capitalized [Member]
Balance				703				703	703	703	703
Cost incurred during the year									0	0	0
Write off of unsuccessful exploration costs										0	0
Transfer of projects under exploration and development to projects under construction									0
Balance	703				703				703	703	703
Construction in Progress [Member]
Balance				190,732				229,667	190,732	229,667	252,262
Cost incurred during the year									267,237	219,610	239,226
Transfer of projects under exploration and development to projects under construction									3,536
Balance	291,918				190,732				291,918	190,732	229,667
Transfer of completed projects to property, plant and equipment									(134,152)	(261,833)	(261,821)
Cost write off										(1,380)
Fair value of projects under construction acquired in a business combination										4,668
Insurance recoveries									(35,435)
Construction in Progress [Member] | Up-front Bonus Lease Costs [Member]
Balance				27,473				27,473	27,473	27,473	37,713
Cost incurred during the year									0	0	0
Transfer of projects under exploration and development to projects under construction									0
Balance	27,473				27,473				27,473	27,473	27,473
Transfer of completed projects to property, plant and equipment									0	0	(10,240)
Cost write off										0
Fair value of projects under construction acquired in a business combination										0
Insurance recoveries									0
Construction in Progress [Member] | Drilling And Construction Costs [Member]
Balance				160,398				198,943	160,398	198,943	202,211
Cost incurred during the year									264,137	219,610	231,926
Transfer of projects under exploration and development to projects under construction									3,536
Balance	258,484				160,398				258,484	160,398	198,943
Transfer of completed projects to property, plant and equipment									(134,152)	(261,443)	(235,194)
Cost write off										(1,380)
Fair value of projects under construction acquired in a business combination										4,668
Insurance recoveries									(35,435)
Construction in Progress [Member] | Interest Capitalized [Member]
Balance				$ 2,861				$ 3,251	2,861	3,251	12,338
Cost incurred during the year									3,100	0	7,300
Transfer of projects under exploration and development to projects under construction									0
Balance	$ 5,961				$ 2,861				5,961	2,861	3,251
Transfer of completed projects to property, plant and equipment									0	(390)	$ (16,387)
Cost write off										0
Fair value of projects under construction acquired in a business combination										$ 0
Insurance recoveries									$ 0

Note 9 - Intangible Assets an_3

Note 9 - Intangible Assets and Goodwill (Details Textual) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets, Net, Ending Balance	$ 186,220								$ 186,220
Amortization of Intangible Assets, Total									13,300	$ 11,200	$ 6,900
Increase (Decrease) in Intangible Assets, Current									0	127,000	35,600
Finite Lived Intangible Assets, Write off	0				$ 0				0	0	0
Goodwill, Ending Balance	20,140				19,950				20,140	19,950	21,037
Goodwill, Impairment Loss	0	$ 0	$ 0	$ 0	13,464	$ 0	$ 0	$ 0	0	13,464	0
Storage and Energy Management Service [Member]
Goodwill, Impairment Loss										13,500
Other Segments [Member]
Goodwill, Impairment Loss									0	0	$ 0
Power Purchase Agreements and Intangible Assets Related to Storage Activities [Member]
Finite-Lived Intangible Assets, Net, Ending Balance	186,200				199,900				186,200	199,900
Finite-Lived Intangible Assets, Accumulated Amortization	74,100				61,500				74,100	61,500
Intangible Assets Related to Storage Activities [Member]
Finite-Lived Intangible Assets, Net, Ending Balance	30,200				32,200				30,200	32,200
Finite-Lived Intangible Assets, Accumulated Amortization	$ 5,400				$ 3,400				$ 5,400	$ 3,400

Note 9 - Intangible Assets an_4

Note 9 - Intangible Assets and Goodwill - Estimated Future Amortization Expense (Details) $ in Thousands	Dec. 31, 2019USD ($)
2020	$ 12,983
2021	12,983
2022	12,729
2023	12,610
2024	11,255
Thereafter	123,660
Total	$ 186,220

Note 9 - Intangible Assets an_5

Note 9 - Intangible Assets and Goodwill - Goodwill (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill				$ 19,950				$ 21,037	$ 19,950	$ 21,037
Goodwill acquired									0	12,710
Goodwill impairment charge	$ 0	$ 0	$ 0	$ 0	$ (13,464)	$ 0	$ 0	$ 0	0	(13,464)	$ 0
Translation differences									190	(333)
Goodwill	$ 20,140				$ 19,950				$ 20,140	$ 19,950	$ 21,037

Note 10 - Accounts Payable an_3

Note 10 - Accounts Payable and Accrued Expenses - Accounts Payable and Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
Trade payable	$ 73,271		$ 56,299
Salaries and other payroll costs	24,364		20,188
Customer advances	2,092		918
Accrued interest	6,321		5,914
Income tax payable	11,344		8,436
Property tax payable	3,033		2,999
Scheduling and transmission	2,264		595
Royalty accrual	6,457		4,610
Deferred revenues	2,755		18,402
Warranty accrual	3,245		4,552
Other	9,466		9,551
Total	141,857	$ 113,502	116,362
Deferred Revenue [Member]
Deferred revenues	$ 0		$ 2,300

Note 11 - Long-term Debt, Cre_3

Note 11 - Long-term Debt, Credit Agreements and Commercial Paper (Details Textual) $ in Thousands

Jul. 03, 2019USD ($)

May 30, 2019

Mar. 25, 2019USD ($)

Mar. 22, 2018USD ($)

Dec. 21, 2016USD ($)

Nov. 29, 2016USD ($)

Jul. 31, 2015USD ($)MWh

Nov. 30, 2013USD ($)

Sep. 26, 2013

Feb. 28, 2013USD ($)

Nov. 30, 2012USD ($)

Feb. 29, 2012

Oct. 31, 2019USD ($)

Oct. 31, 2018USD ($)MWh

May 31, 2016USD ($)

Jun. 30, 2014USD ($)

May 31, 2013USD ($)

Nov. 30, 2012USD ($)

Oct. 31, 2011USD ($)

Aug. 31, 2011USD ($)

Dec. 31, 2005USD ($)

Dec. 31, 2020USD ($)

Dec. 31, 2019USD ($)

Dec. 31, 2018USD ($)

Dec. 31, 2017USD ($)

May 04, 2019USD ($)

Apr. 29, 2019

Apr. 09, 2019USD ($)

Apr. 04, 2019USD ($)

Jan. 04, 2019USD ($)

May 31, 2017USD ($)

Dec. 31, 2016USD ($)

Oct. 20, 2016USD ($)

Sep. 30, 2016

Aug. 29, 2014USD ($)

Aug. 23, 2012USD ($)

Sep. 30, 2011USD ($)

Letters of Credit Outstanding, Amount

$ 213,800

Debt To Earnings Before Interest Tax Depreciation And Amortization Ratio

2.99

Proceeds from Issuance of Commercial Paper

$ 50,000

$ 50,000

$ 0

$ 0

Commercial Paper

50,000

0

Stockholders' Equity Attributable to Parent, Ending Balance

$ 1,392,420

1,319,837

Percentage Of Company Assets

46.60%

Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance

$ 1,515,410

1,445,096

$ 1,295,700

$ 1,168,272

Payments of Dividends, Total

22,400

Commercial Paper [Member]

Commercial Paper

$ 50,000

Covenant Requirement Minimum [Member]

Amount Available For Dividend Distribution Percent Of Cumulative Net Income

35

Stockholders' Equity Attributable to Parent, Ending Balance

$ 600,000

Percentage Of Company Assets

25.00%

Minimum [Member] | Commercial Paper [Member]

Debt Instrument, Term

90 days

Maximum [Member] | Commercial Paper [Member]

Debt Instrument, Term

5 years

Maximum [Member] | Covenant Requirement Minimum [Member]

Debt To Earnings Before Interest Tax Depreciation And Amortization Ratio

6

London Interbank Offered Rate (LIBOR) [Member] | Commercial Paper [Member]

Debt Instrument, Basis Spread on Variable Rate

0.75%

Loan Agreement with Banco Industrial S.A. and Westrust Bank (International) Limited1 [Member]

Debt Instrument, Term

12 years

Debt Instrument, Face Amount

$ 42,000

Power Utilization | MWh

20

Debt Instrument, Payment Frequency

144 months

Loan Agreement with Banco Industrial S.A. and Westrust Bank (International) Limited1 [Member] | Covenant Requirement Minimum [Member]

Debt Services, Coverage Ratio

1.15

Loan Agreement with Banco Industrial S.A. and Westrust Bank (International) Limited1 [Member] | Covenant Required to not Limit Dividends [Member]

Debt Services, Coverage Ratio

1.25

Loan Agreement with Banco Industrial S.A. and Westrust Bank (International) Limited1 [Member] | Minimum [Member]

Debt Instrument, Prepayment Premium Percentage

0.50%

Loan Agreement with Banco Industrial S.A. and Westrust Bank (International) Limited1 [Member] | Maximum [Member]

Debt Instrument, Prepayment Premium Percentage

1.00%

Loan Agreement with Banco Industrial S.A. and Westrust Bank (International) Limited1 [Member] | London Interbank Offered Rate (LIBOR) [Member] | Guaranteed [Member]

Debt Instrument, Basis Spread on Variable Rate

4.35%

Loan Agreement with Banco Industrial S.A. and Westrust Bank (International) Limited1 [Member] | London Interbank Offered Rate (LIBOR) [Member] | Not Guaranteed [Member]

Debt Instrument, Basis Spread on Variable Rate

4.75%

Loan Agreement with Banco Industrial S.A. and Westrust Bank (International) Limited1 [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]

Debt Instrument, Basis Spread on Variable Rate

1.25%

Loan Agreement with Banco Industrial S.A. and Westrust Bank (International) Limited [Member]

Debt Instrument, Face Amount

$ 310,000

Long-term Debt, Gross

$ 26,300

Loan Agreement With OPIC [Member]

Debt Services, Coverage Ratio

1.7

Long-term Debt, Gross

$ 192,600

Debt Instrument, Prepayment Premium, First Two Years, Percentage

2.00%

Debt Instrument, Prepayment Premium, After Year 3, Percentage

1.00%

Restricted Cash and Cash Equivalents, Current, Total

$ 2,500

$ 2,600

Letters of Credit Outstanding, Amount

15,600

Loan Agreement With OPIC [Member] | Tranche One [Member]

Debt Instrument, Face Amount

$ 85,000

$ 85,000

Long-term Debt, Gross

51,900

Prepayment Deposit On Debt

20,500

Loan Agreement With OPIC [Member] | Tranche Two [Member]

Long-term Debt, Gross

135,000

135,000

$ 111,200

Proceeds from Issuance of Debt

$ 45,000

Debt Instrument, Interest Rate, Stated Percentage

6.29%

Loan Agreement With OPIC [Member] | Tranche Three [Member]

Debt Instrument, Face Amount

45,000

45,000

Long-term Debt, Gross

$ 29,600

Proceeds from Issuance of Debt

$ 45,000

Debt Instrument, Interest Rate, Stated Percentage

6.12%

Loan Agreement With OPIC [Member] | Threshold For Loan Default [Member]

Debt Services, Coverage Ratio

1.1

Loan Agreement With OPIC [Member] | Minimum [Member] | Historical [Member]

Debt Services, Coverage Ratio

1.4

Olkaria III DEG [Member] | Tranche One [Member]

Debt Instrument, Face Amount

180,000

$ 180,000

Prepayment Penalty Charges

$ 1,500

Platanares Finance Agreement [Member] | OPIC [Member]

Long-term Debt, Gross

$ 104,500

Prepayment Deposit On Debt

$ 5,000

Proceeds from Issuance of Debt

$ 114,700

Debt Instrument, Interest Rate, Stated Percentage

7.02%

Debt Agreement, Maximum Borrowing Capacity

$ 124,700

Debt Instrument, Prepayment Premium Percentage, First or Second Year

2.00%

Debt Instrument, Prepayment Premium Percentage, Third Year

1.00%

Platanares Finance Agreement [Member] | Historical [Member] | OPIC [Member]

Debt Services, Coverage Ratio

1.1

Platanares Finance Agreement [Member] | Debt Service Reserve [Member] | OPIC [Member]

Restricted Cash and Cash Equivalents, Current, Total

$ 3,600

Letters of Credit Outstanding, Amount

8,100

Platanares Finance Agreement [Member] | Well Drilling Reserve [Member] | OPIC [Member]

Restricted Cash and Cash Equivalents, Current, Total

0

Letters of Credit Outstanding, Amount

$ 2,000

Platanares Finance Agreement [Member] | Threshold For Loan Default [Member] | OPIC [Member]

Debt Services, Coverage Ratio

1.2

Platanares Finance Agreement [Member] | Maximum [Member] | Forecast [Member] | OPIC [Member]

Proceeds from Issuance of Debt

$ 10,000

Platanares [Member]

Current Power Generation | MWh

35

OrCal Senior Secured Notes [Member]

Debt Instrument, Face Amount

$ 165,000

Proceeds from Issuance of Debt

$ 161,100

Debt Instrument, Interest Rate, Stated Percentage

6.21%

Debt Instrument, Issuance Costs

$ 3,900

Repayments of Secured Debt

$ 15,000

Payment for Debt Extinguishment or Debt Prepayment Cost

$ 400

OFC Two Senior Secured Notes [Member]

Debt Instrument, Face Amount

$ 350,000

Government Guarantee Percent

80.00%

Debtor-in-Possession Financing, Letters of Credit Outstanding

$ 19,500

OFC Two Senior Secured Notes [Member] | Senior Notes [Member]

Secured Debt, Total

203,000

OFC Two Senior Secured Notes [Member] | Wholly Owned Subsidiaries With Project Debt [Member]

Debt Instrument, Face Amount

$ 140,000

Debt Instrument, Interest Rate, Stated Percentage

4.61%

OFC Two Senior Secured Notes [Member] | Phase One Series A Senior Notes [Member]

Debt Instrument, Face Amount

$ 151,700

Proceeds from Issuance of Debt

$ 141,100

Debt Instrument, Interest Rate, Stated Percentage

4.687%

Repayments of Long-term Debt, Total

$ 4,300

Other Reserves

$ 0

$ 28,000

OFC Two Senior Secured Notes [Member] | Maximum [Member] | Historical [Member]

Debt Services, Coverage Ratio

1.2

OFC Two Senior Secured Notes [Member] | Maximum [Member] | Projected [Member]

Debt Services, Coverage Ratio

1.5

Don A. Cambell Senior Secured Notes [Member]

Debt Instrument, Face Amount

$ 92,500

Proceeds from Issuance of Debt

$ 87,100

Debt Instrument, Interest Rate, Stated Percentage

4.03%

Secured Debt, Total

$ 78,200

Debt Instrument, Minimum Prepay Amount

$ 2,000

Don A. Cambell Senior Secured Notes [Member] | Minimum [Member]

Debt Services, Coverage Ratio

1.20

Prudential Capital Group Agreement [Member]

Debt Instrument, Term

7 years

Debt Instrument, Face Amount

$ 20,000

Long-term Debt, Gross

18,300

Debt Instrument, Interest Rate, Stated Percentage

5.80%

Line of Credit Facility, Maximum Borrowing Capacity

$ 50,000

Debt Instrument, Remaining Balance

$ 16,000

DOE Loan Guarantee [Member]

Debt Instrument, Term

21 years 6 months

Long-term Debt, Gross

44,900

Debt Instrument, Interest Rate, Stated Percentage

2.60%

Line of Credit Facility, Maximum Borrowing Capacity

$ 96,800

Prudential Capital Purchase Agreement [member]

Debt Instrument, Term

24 years

Long-term Debt, Gross

27,100

Debt Instrument, Interest Rate, Stated Percentage

6.75%

Senior Unsecured Bonds [Member]

Debt Instrument, Face Amount

67,000

Proceeds from Issuance of Unsecured Debt

250,000

Senior Unsecured Bonds [Member] | Series 3 Bonds [Member]

Debt Instrument, Face Amount

137,000

Senior Unsecured Bonds, Series 2 [Member]

Debt Instrument, Interest Rate, Stated Percentage

3.70%

Senior Unsecured Bonds, Series 3 [Member]

Debt Instrument, Interest Rate, Stated Percentage

4.45%

Migdal Loan [Member]

Debt Instrument, Face Amount

$ 100,000

Debt Instrument, Interest Rate, Stated Percentage

4.80%

Debt Instrument, Periodic Payment, Total

$ 4,200

Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid

$ 37,000

Debt Instrument Increase in Stated Interest Rate if Rating is Downgraded to ILA Negative

0.50%

Debt Instrument Increase in Stated Interest Rate Each Additional Downgrade

0.25%

Debt Instrument Decrease in Stated Interest Rate for Each Rating Upgrade

0.25%

Debt to EBITDA Ratio Threshold for Rate Increase

4.5

Debt Instrument Increase in Stated Interest Rate if Debt to EBITDA Ratio Exceeds Threshold

0.50%

Debt to EBITDA Ratio Requirement

6

Stockholders Equity, Debt Covenant, Minimum Threshold

$ 650,000

Stockholders Equity to Total Assets, Ratio

25.00%

Stockholders Equity, Debt Covenant, Minimum Threshold to Pay Dividends

$ 800,000

Dividends to Net Income, Ratio

50.00%

Migdal Loan [Member] | Minimum [Member]

Debt Instrument, Interest Rate, Stated Percentage

4.80%

Migdal Loan [Member] | Maximum [Member]

Debt Instrument, Increase in Stated Interest Rate

1.00%

Additional Migdal Loan [Member]

Debt Instrument, Face Amount

$ 50,000

Debt Instrument, Interest Rate, Stated Percentage

4.60%

Debt Instrument, Periodic Payment, Total

$ 2,100

Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid

$ 18,500

DEG 2 Facility Agreement [Member]

Debt Instrument, Interest Rate, Stated Percentage

6.28%

Debt Instrument, Minimum Prepay Amount

$ 5,000

Line of Credit Facility, Maximum Borrowing Capacity

$ 50,000

Proceeds from Lines of Credit, Total

$ 50,000

Long-term Line of Credit, Total

42,500

DEG 3 Loan Agreement [Member]

Long-term Debt, Gross

37,100

Debt Instrument, Interest Rate, Stated Percentage

6.04%

DEG 3 Loan Agreement [Member] | OrPower 4, Inc [Member]

Debt Instrument, Face Amount

$ 41,500

Plumstriker Loan Agreement [Member] | Plumstriker and its Two Subsidiaries [Member]

Debt Instrument, Face Amount

$ 23,500

Long-term Debt, Gross

21,600

Debt Instrument, Equal Quarterly Principal Installments, Percentage of Loan

1.25%

Plumstriker Loan Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Plumstriker and its Two Subsidiaries [Member]

Debt Instrument, Basis Spread on Variable Rate

3.50%

Loan Agreement with Société Général [Member] | Guadeloupe 1 [Member]

Debt Instrument, Face Amount

$ 8,900

Long-term Debt, Gross

8,400

Debt Instrument, Interest Rate, Stated Percentage

1.52%

Loan Agreement with Bpifrance [Member] | Guadeloupe 1 [Member]

Debt Instrument, Face Amount

$ 8,900

Long-term Debt, Gross

9,000

Debt Instrument, Interest Rate, Stated Percentage

1.93%

Credit Agreements With Eight Commercial Banks [Member]

Letters of Credit Outstanding, Amount

213,700

Line of Credit Facility, Maximum Borrowing Capacity

505,000

Long-term Line of Credit, Total

40,600

Credit Agreements With Eight Commercial Banks [Member] | Extensions of Credit in The Form of Loans and/or Letters of Credit [Member]

Line of Credit Facility, Maximum Borrowing Capacity

260,000

Credit Agreements With Eight Commercial Banks [Member] | Letter of Credit [Member]

Line of Credit Facility, Maximum Borrowing Capacity

245,000

Credit Agreements With Eight Commercial Banks [Member] | Union Bank, N.A. [Member]

Line of Credit Facility, Maximum Borrowing Capacity

60,000

Credit Agreements With Eight Commercial Banks [Member] | HSBC Bank USA, N.A. [Member]

Line of Credit Facility, Maximum Borrowing Capacity

$ 35,000

Union Bank, N.A. [Member]

Debt Services, Coverage Ratio

2.87

Letters of Credit Outstanding, Amount

$ 59,500

Line of Credit Facility, Maximum Borrowing Capacity

$ 60,000

Debt To Earnings Before Interest Tax Depreciation And Amortization Ratio

2.1

Amount Available For Dividend Distribution Percent Of Cumulative Net Income

2

1

Union Bank, N.A. [Member] | Minimum [Member]

Debt Services, Coverage Ratio

1.35

Union Bank, N.A. [Member] | Maximum [Member]

Debt To Earnings Before Interest Tax Depreciation And Amortization Ratio

4.5

HSBC Bank USA, N.A. [Member]

Debt Services, Coverage Ratio

2.87

Letters of Credit Outstanding, Amount

$ 25,500

Line of Credit Facility, Maximum Borrowing Capacity

$ 35,000

Debt To Earnings Before Interest Tax Depreciation And Amortization Ratio

2.1

Amount Available For Dividend Distribution Percent Of Cumulative Net Income

1

Line of Credit Facility, Borrowing Capacity Increase

$ 10,000

HSBC Bank USA, N.A. [Member] | Minimum [Member]

Debt To Earnings Before Interest Tax Depreciation And Amortization Ratio

1.35

HSBC Bank USA, N.A. [Member] | Maximum [Member]

Debt To Earnings Before Interest Tax Depreciation And Amortization Ratio

4.5

Amount Available For Dividend Distribution Percent Of Cumulative Net Income

2

Surety Agreement [Member] | Chubb [Member]

Surety Bonds Available

$ 200,000

Surety Bonds Outstanding

$ 144,800

Note 11 - Long-term Debt, Cre_4

Note 11 - Long-term Debt, Credit Agreements and Commercial Paper - Long-term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Limited Resource	$ 732,461	$ 775,547
Less current portion	(58,932)	(63,180)
Non current portion	673,529	712,367
Recourse Debt	474,514	510,832
Less current portion	(117,122)	(164,000)
Non current portion	357,392	346,832
Other Loans, Limited and Non-recourse [Member]
Non-Recourse Debt	8,997	6,241
Loan Agreement With OPIC the Olkaria III Power Plant [Member]
Non-Recourse Debt	192,646	210,641
Platanares Loan - OPIC [Member]
Non-Recourse Debt	104,459	112,652
Loan Agreement with Banco Industrial S.A. and Westrust Bank (International) Limited [Member]
Non-Recourse Debt	26,250	29,750
Plumstriker Loan Agreement [Member]
Non-Recourse Debt	21,615	0
Other Loans, Limited Resource [Member]
Non-Recourse Debt	8,367	0
Limited Resource	88,840	96,482
OrCal Geothermal Inc [Member]
Non-Recourse Debt		18,652
Don A. Campbell 1 ("DAC1") [Member]
Non-Recourse Debt	78,247	83,319
Ormat Funding Corp [Member]
Limited Resource	203,040	217,810
Senior Unsecured Bonds [Member]
Recourse Debt	204,332	204,332
Migdal Loan [Member]
Recourse Debt	150,000	100,000
Olkaria III DEG [Member]
Recourse Debt	79,632	47,500
Revolving Credit Lines With Banks [Member]
Recourse Debt	$ 40,550	$ 159,000

Note 11 - Long-term Debt, Cre_5

Note 11 - Long-term Debt, Credit Agreements and Commercial Paper - Future Minimum Payments Under Long-term Obligations (Details) $ in Thousands	Dec. 31, 2019USD ($)
2020	$ 135,504
2021	76,259
2022	220,677
2023	98,982
2024	78,600
Thereafter	557,890
Total	$ 1,167,912

Note 12 - Puna Power Plant Tr_2

Note 12 - Puna Power Plant Transactions (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2005	Dec. 31, 2018
Lease Term		31 years
Deferred Lease Income, before Accumulated Amortization		$ 83,000
Lease Payment Term		23 years
Deferred Costs, Leasing, Gross			$ 4,200
Capital Leases, Balance Sheet, Assets by Major Class, Net, Total			19,700
Capital Leases, Lessee Balance Sheet, Assets by Major Class, Accumulated Depreciation			$ 33,100
Puna Geothermal Power Plant [Member]
Operating Leases, Future Minimum Payments Due, Total	$ 0
Amended and Restated PPA [Member]
Price Per MWh Under 227,000 MWh	$ 70
Price Per MWh Over 227,000 MWh	$ 40
Long-term Contract for Purchase of Electric Power, Estimated Annual Cost	$ 19,500
Loss on Contract Termination	$ 20,500

Note 13 - Tax Monetization Tr_2

Note 13 - Tax Monetization Transactions (Details Textual) $ in Thousands	Dec. 31, 2022	Aug. 14, 2019USD ($)MWh	May 17, 2018USD ($)MWh	Oct. 31, 2017USD ($)	Jul. 10, 2017USD ($)	Dec. 16, 2016USD ($)	Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2022USD ($)
Proceeds from Noncontrolling Interests							$ 3,346	$ 4,134	$ 2,017
Payments to Acquire Additional Interest in Subsidiaries							$ 0	0	2,400
OPC LLC [Member]
Noncontrolling Interest, Decrease (Increase) from Redemptions or Purchase of Interests								6,500
Adjustment to Additional Paid in Capital, from Redemptions or Purchase of Interests								$ 8,500
Ormat Nevada ORTP LLC [Member]
Noncontrolling Interest, Decrease (Increase) from Redemptions or Purchase of Interests									7,000
Adjustment to Additional Paid in Capital, from Redemptions or Purchase of Interests									$ 2,900
Opal Geo LLC [Member]
Percentage Of Distributable Cash to Controlling Interest						97.50%
Percentage of Income (Loss), Gain, Deduction and Credit Allocated to Controlling Interests						1.00%
Percentage of Income (Loss), Gain, Deduction and Credit Allocated to Controlling Interests, PTCs Not Available						95.00%
Opal Geo LLC [Member] | Forecast [Member]
Percentage of Income (Loss), Gain, Deduction and Credit Allocated to Controlling Interests	95.00%
Opal Geo LLC [Member] | Capital Unit, Class A [Member]
Percentage Of Ownership Interests						100.00%
Opal Geo LLC [Member] | JPM Capital Corporation [Member]
Proceeds from Noncontrolling Interests						$ 62,100
Percentage Of Distributable Cash to Nontrolling Interests						2.50%
Percentage of Income (Loss), Gain, Deduction and Credit Allocated to Noncontrolling Interests						99.00%
Percentage of Income (Loss), Gain, Deduction and Credit Allocated to Noncontrolling Interests, PTCs Not Available						5.00%
Opal Geo LLC [Member] | JPM Capital Corporation [Member] | Noncontrolling Interest [Member]
Proceeds from Noncontrolling Interests						$ 3,700
Opal Geo LLC [Member] | JPM Capital Corporation [Member] | Allocation to Liability Associated With Sale of Tax Benefits [Member]
Proceeds from Noncontrolling Interests						$ 58,500
Opal Geo LLC [Member] | JPM Capital Corporation [Member] | Forecast [Member]
Proceeds from Noncontrolling Interests										$ 21,000
Percentage Of Distributable Cash to Nontrolling Interests	100.00%
Percentage of Income (Loss), Gain, Deduction and Credit Allocated to Noncontrolling Interests	5.00%
Opal Geo LLC [Member] | JPM Capital Corporation [Member] | Capital Unit, Class B [Member]
Percentage of Equity Interest Sold						100.00%
Ormat Nevada ORTP LLC [Member] | ORTP Transaction [Member]
Payments to Acquire Additional Interest in Subsidiaries				$ 1,900
Payments to Acquire Interest in Joint Venture					$ 2,400
DAC 2 [Member]
Percentage Of Ownership Interests						63.25%
Other Geothermal Power Plants [Member]
Percentage Of Ownership Interests						100.00%
OPC LLC [Member] | JPM Capital Corporation [Member] | Capital Unit, Class B [Member]
Fair Value of Equity Interest Sold						$ 3,000
Tungsten Mountain [Member]
Power Generated Under Contract | MWh			26
Parternship Agreement, Initial Purchase Price			$ 33,400
Partnership Agreement, Expected Additional Installments			$ 13,000
Partnership Agreement, Percentage of Distributable Cash Flow Generated			97.50%
Partnership Agreement, Percentage of Taxable Income			95.00%
Partnership Agreement, Percentage of Distributable Cash Flow Generated to Private Investor if Target Return Not Reached			100.00%
Partnership Agreement, Percentage of Taxable Income to Private Investor if Target Return Not Reached			99.00%
Partnership Agreement, Percentage of Taxable Income to Private Investor if Target Return Not Reached, No Longer Generating PTCs			5.00%
McGinness Plant [Member]
Power Generated Under Contract | MWh		48
Parternship Agreement, Initial Purchase Price		$ 59,300
Partnership Agreement, Expected Additional Installments		$ 9,000
Partnership Agreement, Percentage of Distributable Cash Flow Generated		97.50%
Partnership Agreement, Percentage of Taxable Income		95.00%
Partnership Agreement, Percentage of Distributable Cash Flow Generated to Private Investor if Target Return Not Reached		100.00%
Partnership Agreement, Percentage of Taxable Income to Private Investor if Target Return Not Reached		99.00%
Partnership Agreement, Percentage of Taxable Income to Private Investor if Target Return Not Reached, No Longer Generating PTCs		5.00%
McGinness Plant [Member] | Maximum [Member]
Partnership Agreement, Expected Additional Installments		$ 22,000

Note 14 - Asset Retirement Ob_3

Note 14 - Asset Retirement Obligations - Reconciliation of the Beginning and Ending Aggregate Carrying Amount of Asset Retirement Obligation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Balance at beginning of year	$ 39,475	$ 27,110
Revision in estimated cash flows	(335)	(258)
Liabilities incurred and acquired	8,334	10,149
Accretion expense	2,709	2,474	$ 1,874
Balance at end of year	$ 50,183	$ 39,475	$ 27,110

Note 15 - Stock-based Compens_3

Note 15 - Stock-based Compensation (Details Textual) - USD ($) $ / shares in Units, $ in Millions	Nov. 07, 2019	May 07, 2018	May 31, 2012	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount, Total				$ 8.4			$ 8.4
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition							1 year 2 months 12 days
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Annual Forfeiture Rate				10.70%	5.30%	1.10%
Increase (Decrease) In Stock Based Compensation Expense Due To Forfeitures, Percent				101.90%	381.80%	(89.30%)
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Dividends Growth Rate							20.00%
Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Weighted Average Expected Dividend Rate							0.70%
Share Price				$ 74.52	$ 52.30		$ 74.52	$ 52.30
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number				479,402	846,215		479,402	846,215
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value							$ 19.3	$ 5.2
Weighted Average [Member]
Share Price				$ 65.04	$ 55.58		$ 65.04	$ 55.58
2012 Stock Incentive Plan [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period			6 years
2012 Stock Incentive Plan [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period			10 years
2012 Stock Incentive Plan [Member] | Stock Options And Stock Appreciation Rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized			4,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			1 year
2012 Stock Incentive Plan [Member] | Stock Options And Stock Appreciation Rights [Member] | Share-based Payment Arrangement, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage			25.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			24 months
2012 Stock Incentive Plan [Member] | Stock Options And Stock Appreciation Rights [Member] | Share-based Payment Arrangement, Tranche One [Member] | Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage			100.00%
2012 Stock Incentive Plan [Member] | Stock Options And Stock Appreciation Rights [Member] | Share-based Payment Arrangement, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage			25.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			36 months
2012 Stock Incentive Plan [Member] | Stock Options And Stock Appreciation Rights [Member] | Share-based Payment Arrangement, Tranche Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage			50.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			48 months
2012 Stock Incentive Plan [Member] | Stock Options And Stock Appreciation Rights [Member] | Share-based Compensation Award, Tranche Four [Member] | Senior Management [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage			25.00%
2012 Stock Incentive Plan [Member] | Share-based Payment Arrangement, Option [Member] | Non Employee Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			1 year
The 2018 Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized		5,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant				3,584,485			3,584,485
The 2018 Incentive Plan [Member] | Stock Appreciation Rights and Restricted Stock Units [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period		6 years
The 2018 Incentive Plan [Member] | Stock Appreciation Rights and Restricted Stock Units [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period		10 years
The 2018 Incentive Plan [Member] | Stock Appreciation Rights and Restricted Stock Units [Member] | Share-based Payment Arrangement, Tranche One [Member] | Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage		100.00%
The 2018 Incentive Plan [Member] | Stock Appreciation Rights and Restricted Stock Units [Member] | Share-based Payment Arrangement, Tranche One [Member] | Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage		50.00%
The 2018 Incentive Plan [Member] | Stock Appreciation Rights and Restricted Stock Units [Member] | Share-based Payment Arrangement, Tranche Two [Member] | Employees [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage		25.00%
The 2018 Incentive Plan [Member] | Stock Appreciation Rights (SARs) [Member] | Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	6 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	11,495
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Exercise Price	$ 76.87
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value							$ 19.8
The 2018 Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member] | Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	9,420
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value							$ 76.4
The 2012 and 2004 Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant				0			0

Note 15 - Stock-based Compens_4

Note 15 - Stock-based Compensation - Compensation Related to Stock-based Awards (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Total stock-based compensation expense	$ 9,359	$ 10,218	$ 8,760
Tax effect on stock-based compensation expense	736	668	604
Net effect of stock-based compensation expense	8,623	9,550	8,156
Cost of Sales [Member]
Total stock-based compensation expense	3,633	3,488	3,369
Selling and Marketing Expense [Member]
Total stock-based compensation expense	4,810	792	452
General and Administrative Expense [Member]
Total stock-based compensation expense	$ 916	$ 5,938	$ 4,939

Note 15 - Stock-based Compens_5

Note 15 - Stock-based Compensation - Fair Value of Stock-based Award on the Date of Grant (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Risk-free interest rates	1.80%	2.80%	1.90%
Expected lives (in weighted average years) (Year)	3 years 6 months	3 years 6 months	3 years 1 month 6 days
Dividend yield	0.70%	0.90%	0.62%
Expected volatility (weighted average)	25.10%	25.50%	27.20%
Forfeiture rate for directors	8.60%	3.10%

Note 15 - Stock-based Compens_6

Note 15 - Stock-based Compensation - Fair Value of Stock-based Award Using Exercise Multiple-based Lattice SAR Pricing Model Assumptions (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Risk-free interest rate	1.80%	2.80%	1.90%
Expected life (in years) (Year)	3 years 6 months	3 years 6 months	3 years 1 month 6 days
Dividend yield	0.70%	0.90%	0.62%
Expected volatility	25.10%	25.50%	27.20%
Forfeiture rate for directors	8.60%	3.10%
Director [Member] | The 2018 Incentive Plan [Member] | Stock Appreciation Rights (SARs) [Member]
Risk-free interest rate	1.79%
Expected life (in years) (Year)	3 years 6 months
Dividend yield	0.57%
Expected volatility	24.80%
Forfeiture rate for directors	0.00%
Sub-Optimal Exercise Factor for directors	2.8

Note 15 - Stock-based Compens_7

Note 15 - Stock-based Compensation - Summary of the Status of the 2012 Incentive Plan (Details) - $ / shares shares in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Outstanding at beginning of year (in shares)		2,527
Outstanding at end of year (in shares)		1,792	2,527
2012 Incentive Plan [Member]
Outstanding at beginning of year (in shares)		2,527	1,548	2,565
Outstanding at beginning of year (in dollars per share)		$ 46.77	$ 41.35	$ 33.36
Stock Options (in shares)		0	0	30
Stock Options (in dollars per share)		$ 0	$ 0	$ 57.97
Exercised (in shares)		(711)	(203)	(1,181)
Exercised (in dollars per share)		$ 37.83	$ 29.75	$ 25.92
Forfeited (in shares)		(71)	(64)	(21)
Forfeited (in dollars per share)		$ 50.59	$ 45.73	$ 46.15
Expired (in shares)		0	0	0
Expired (in dollars per share)		$ 0	$ 0	$ 0
Outstanding at end of year (in shares)		1,792	2,527	1,548
Outstanding at end of year (in dollars per share)		$ 50.39	$ 46.77	$ 41.35
Options and SARs exercisable at end of year (in shares)		479	846	431
Options and SARs exercisable at end of year (in dollars per share)		$ 48.35	$ 42.06	$ 32.61
Weighted-average fair value of options and SARs granted during the year (in dollars per share)		$ 29.24	$ 16.45	$ 22.82
2012 Incentive Plan [Member] | Stock Appreciation Rights (SARs) [Member]
Other than Options (in shares)	[1]	38	1,172	132
Other than Options (in dollars per share)	[1]	$ 69.13	$ 53.87	$ 62.55
2012 Incentive Plan [Member] | Restricted Stock Units (RSUs) [Member]
Other than Options (in shares)	[2]	9	74	23
Other than Options (in dollars per share)	[2]	$ 0	$ 0	$ 0
[1]	Upon exercise, SARs entitle the recipient to receive shares of common stock equal to the increase in value of the award between the grant date and the exercise date.
[2]	An RSU represents the right to receive one share of common stock once certain vesting conditions are met. The value of an RSU is identical to the value of the underlying stock.

Note 15 - Stock-based Compens_8

Note 15 - Stock-based Compensation - Summary of Information About Stock-based Awards Outstanding (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Number of shares outstanding (in shares)	1,792	2,527
Weighted average remaining contractual life in years, options outstanding (Year)	3 years 9 months 18 days	4 years 3 months 18 days
Aggregate intrinsic value, options outstanding	$ 43,277	$ 17,283
Number of shares exercisable (in shares)	479	846
Aggregate intrinsic value, options exercisable	$ 11,729	$ 9,389
Weighted average remaining contractual life in years, options exercisable (Year)	3 years 2 months 12 days	3 years 3 months 18 days
Exercise Price 1 [Member]
Number of shares outstanding (in shares)	59	75
Weighted average remaining contractual life in years, options outstanding (Year)	1 year 6 months	1 year 9 months 18 days
Aggregate intrinsic value, options outstanding	$ 4,369	$ 3,933
Number of shares exercisable (in shares)	0	0
Aggregate intrinsic value, options exercisable	$ 0	$ 0
Exercise price (in dollars per share)		$ 0
Exercise Price 2 [Member]
Number of shares outstanding (in shares)	427	29
Weighted average remaining contractual life in years, options outstanding (Year)	2 years 6 months	3 months 18 days
Aggregate intrinsic value, options outstanding	$ 13,517	$ 924
Number of shares exercisable (in shares)	230	29
Aggregate intrinsic value, options exercisable	$ 7,295	$ 924
Exercise price (in dollars per share)	$ 42.87	$ 20.13
Weighted average remaining contractual life in years, options exercisable (Year)	2 years 6 months	3 months 18 days
Exercise Price 3 [Member]
Number of shares outstanding (in shares)	15	99
Weighted average remaining contractual life in years, options outstanding (Year)	3 years 10 months 24 days	4 months 24 days
Aggregate intrinsic value, options outstanding	$ 406	$ 2,897
Number of shares exercisable (in shares)	15	99
Aggregate intrinsic value, options exercisable	$ 406	$ 2,897
Exercise price (in dollars per share)	$ 47.46	$ 23.34
Weighted average remaining contractual life in years, options exercisable (Year)	3 years 10 months 24 days	4 months 24 days
Exercise Price 4 [Member]
Number of shares outstanding (in shares)	8	15
Weighted average remaining contractual life in years, options outstanding (Year)	5 years	4 years 1 month 6 days
Aggregate intrinsic value, options outstanding	$ 182	$ 257
Number of shares exercisable (in shares)	0	15
Aggregate intrinsic value, options exercisable	$ 0	$ 257
Exercise price (in dollars per share)	$ 51.71	$ 35.15
Weighted average remaining contractual life in years, options exercisable (Year)		4 years 1 month 6 days
Exercise Price 5 [Member]
Number of shares outstanding (in shares)	35	15
Weighted average remaining contractual life in years, options outstanding (Year)	4 years 10 months 24 days	3 years 9 months 18 days
Aggregate intrinsic value, options outstanding	$ 756	$ 211
Number of shares exercisable (in shares)	15	15
Aggregate intrinsic value, options exercisable	$ 329	$ 211
Exercise price (in dollars per share)	$ 53.16	$ 38.24
Weighted average remaining contractual life in years, options exercisable (Year)	4 years 10 months 24 days	3 years 9 months 18 days
Exercise Price 6 [Member]
Number of shares outstanding (in shares)	783	942
Weighted average remaining contractual life in years, options outstanding (Year)	4 years 6 months	3 years 6 months
Aggregate intrinsic value, options outstanding	$ 16,498	$ 8,879
Number of shares exercisable (in shares)	0	521
Aggregate intrinsic value, options exercisable	$ 0	$ 4,918
Exercise price (in dollars per share)	$ 53.44	$ 42.87
Weighted average remaining contractual life in years, options exercisable (Year)		3 years 6 months
Exercise Price 7 [Member]
Number of shares outstanding (in shares)	296	38
Weighted average remaining contractual life in years, options outstanding (Year)	3 years 10 months 24 days	4 years 10 months 24 days
Aggregate intrinsic value, options outstanding	$ 5,724	$ 182
Number of shares exercisable (in shares)	131	38
Aggregate intrinsic value, options exercisable	$ 2,527	$ 182
Exercise price (in dollars per share)	$ 55.16	$ 47.46
Weighted average remaining contractual life in years, options exercisable (Year)	3 years 10 months 24 days	4 years 10 months 24 days
Exercise Price 8 [Member]
Number of shares outstanding (in shares)	30	35
Weighted average remaining contractual life in years, options outstanding (Year)	4 years 7 months 6 days	5 years 10 months 24 days
Aggregate intrinsic value, options outstanding	$ 497	$ 0
Number of shares exercisable (in shares)	30	0
Aggregate intrinsic value, options exercisable	$ 497	$ 0
Exercise price (in dollars per share)	$ 57.97	$ 53.16
Weighted average remaining contractual life in years, options exercisable (Year)	4 years 7 months 6 days
Exercise Price 9 [Member]
Number of shares outstanding (in shares)	12	828
Weighted average remaining contractual life in years, options outstanding (Year)	2 years 6 months	5 years 6 months
Aggregate intrinsic value, options outstanding	$ 187	$ 0
Number of shares exercisable (in shares)	6	0
Aggregate intrinsic value, options exercisable	$ 94	$ 0
Exercise price (in dollars per share)	$ 58.79	$ 53.44
Weighted average remaining contractual life in years, options exercisable (Year)	2 years 6 months
Exercise Price 10 [Member]
Number of shares outstanding (in shares)	98	296
Weighted average remaining contractual life in years, options outstanding (Year)	3 years 10 months 24 days	4 years 10 months 24 days
Aggregate intrinsic value, options outstanding	$ 1,094	$ 0
Number of shares exercisable (in shares)	52	66
Aggregate intrinsic value, options exercisable	$ 581	$ 0
Exercise price (in dollars per share)	$ 63.35	$ 55.16
Weighted average remaining contractual life in years, options exercisable (Year)	3 years 10 months 24 days	4 years 10 months 24 days
Exercise Price 11 [Member]
Number of shares outstanding (in shares)	4	30
Weighted average remaining contractual life in years, options outstanding (Year)	5 years 7 months 6 days	5 years 7 months 6 days
Aggregate intrinsic value, options outstanding	$ 11	$ 0
Number of shares exercisable (in shares)	0	30
Aggregate intrinsic value, options exercisable	$ 0	$ 0
Exercise price (in dollars per share)	$ 71.71	$ 57.97
Weighted average remaining contractual life in years, options exercisable (Year)		5 years 7 months 6 days
Exercise Price 12 [Member]
Number of shares outstanding (in shares)	15	16
Weighted average remaining contractual life in years, options outstanding (Year)	5 years 8 months 12 days	3 years 6 months
Aggregate intrinsic value, options outstanding	$ 36	$ 0
Number of shares exercisable (in shares)	0	0
Aggregate intrinsic value, options exercisable	$ 0	$ 0
Exercise price (in dollars per share)	$ 72.14	$ 58.79
Exercise Price 13 [Member]
Number of shares outstanding (in shares)	10	109
Weighted average remaining contractual life in years, options outstanding (Year)	5 years 10 months 24 days	4 years 10 months 24 days
Aggregate intrinsic value, options outstanding	$ 0	$ 0
Number of shares exercisable (in shares)	0	33
Aggregate intrinsic value, options exercisable	$ 0	$ 0
Exercise price (in dollars per share)	$ 76.43	$ 63.35
Weighted average remaining contractual life in years, options exercisable (Year)		4 years 10 months 24 days

Note 17 - Interest Expense, N_3

Note 17 - Interest Expense, Net - Components of Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest related to sale of tax benefits									$ 11,786	$ 11,284	$ 6,985
Interest expense									71,883	63,368	54,381
Less — amount capitalized									(3,285)	(3,728)	(7,224)
	$ 17,568	$ 20,076	$ 21,517	$ 21,223	$ 22,034	$ 18,700	$ 15,846	$ 14,344	$ 80,384	$ 70,924	$ 54,142

Note 18 - Income Taxes (Details

Note 18 - Income Taxes (Details Textual) - USD ($) $ in Thousands		Apr. 24, 2018	Sep. 11, 2015	Dec. 31, 2019	Jul. 31, 2019	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2014	Dec. 31, 2016
Deferred Tax Assets, Tax Credit Carryforwards, General Business				$ 100,524			$ 90,913					$ 100,524	$ 90,913
Deferred Tax Assets, Tax Credit Carryforwards, Foreign				92,497			58,072					92,497	58,072
Deferred Tax Assets, Investments				813			813					813	813
Deferred Tax Assets, Valuation Allowance, Total				17,412			22,441	$ 77,571				17,412	$ 22,441	$ 77,571		$ 116,234
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount												$ (5,000)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent												21.00%	21.00%	35.00%
Uncertain Tax Benefit, Reudction to Deferred Tax Asset	[1]			95			95	95				$ 95	$ 95	$ 95
Deferred Tax Liabilities, Gross, Total				97,126			61,323	61,961				97,126	61,323	61,961
Foreign Earnings Repatriated								300,000						396,000
Distribution of Earnings in Foreign Subsidiaries							96,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate				14,600			11,800					$ 14,600	11,800
Depreciation Bonus Permitted Write Off Equipment Cost Percentage												100.00%
Placed in Service After December 31, 2022 and Before January 1, 2024 [Member]
Depreciation Bonus Permitted Write Off Equipment Cost Percentage												80.00%
Placed in Service After December 31, 2023 and Before January 1, 2025 [Member]
Depreciation Bonus Permitted Write Off Equipment Cost Percentage												60.00%
Placed in Service After December 31, 2024 and Before January 1, 2026 [Member]
Depreciation Bonus Permitted Write Off Equipment Cost Percentage												40.00%
Placed in Service After December 31, 2025 and Before January 1, 2027 [Member]
Depreciation Bonus Permitted Write Off Equipment Cost Percentage												20.00%
Accounting Standards Update 2013-11 [Member]
Uncertain Tax Benefit, Reudction to Deferred Tax Asset								$ 100						$ 100
U.S. Geothermal [Member]
Business Acquisition, Percentage of Voting Interests Acquired		100.00%
Business Combination, Consideration Transferred, Total		$ 110,000
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets (Liabilities), Net		1,700
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets		1,700
Deferred Taxes, Business Combination, Valuation Allowance, Available to Reduce Deferred Tax Asset		2,100
General Business Tax Credit Carryforward [Member]
Deferred Tax Assets, Tax Credit Carryforwards, General Business				100,500								$ 100,500
Tax Credit Carryforward Expiration Period												20 years
Minimum [Member] | General Business Tax Credit Carryforward [Member]
Tax Credit Carryforward Expiration Year												2022
Maximum [Member] | General Business Tax Credit Carryforward [Member]
Tax Credit Carryforward Expiration Year												2039
Domestic Tax Authority [Member]
Operating Loss Carryforwards, Total				132,700								$ 132,700
Operating Loss Carryforwards Expiring Amount				127,900								127,900
Operating Loss Carryforwards Available For Indefinite Period				4,800								$ 4,800
Open Tax Year												2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019
Domestic Tax Authority [Member] | U.S. Geothermal [Member]
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets		115,200
Domestic Tax Authority [Member] | Minimum [Member]
Tax Credit Carryforward Expiration Year												2032
Domestic Tax Authority [Member] | Maximum [Member]
Tax Credit Carryforward Expiration Year												2037
Foreign Tax Authority [Member]
Tax Credit Carryforward Expiration Year												2022
Tax Credit Carryforward Expiration Period												10 years
Deferred Tax Assets, Tax Credit Carryforwards, Foreign				92,500								$ 92,500
Foreign Tax Authority [Member] | Israel Tax Authority [Member]
Foreign Income Tax Expense (Benefit), Continuing Operations, Total												$ 13,900	14,400
Deferred Tax Liabilities, Gross, Total							$ 0						$ 0
National Corporate Tax Rate												23.00%	23.00%	24.00%
Foreign Tax Authority [Member] | Israel Tax Authority [Member] | Ormat Systems Ltd [Member]
Effective Income Tax Rate, Year Four and Thereafter															16.00%
Tax Rate on Exempt Income, in Event of Distribution												25.00%
Deferred Tax Liability, Rate, Respect of Tax Exempt Income												25.00%
Foreign Tax Authority [Member] | Tax Authority of Guatemala in Guatemala [Member]
National Corporate Tax Rate												25.00%
Tax Exemption Period												10 years
Effective Income Tax Rate												7.00%
Foreign Tax Authority [Member] | Kenya Revenue Authority [Member]
National Corporate Tax Rate												37.50%
Investment Deduction Percentage			150.00%
Income Tax Examination, Liability (Refund) Adjustment from Settlement with Taxing Authority				0								$ 0
Foreign Tax Authority [Member] | Kenya Revenue Authority [Member] | Tax Years 2014-2017 [Member]
Income Tax Examination, Settlement Demanded Including Accrued Interest and Penalties						$ 5,600
Income Tax Examination, Interest Accrued and Waiver Requested					$ 4,400
Foreign Tax Authority [Member] | Kenya Revenue Authority [Member] | Tax Years 2013-2017 [Member]
Income Tax Examination, Settlement Demanded Including Accrued Interest and Penalties				17,000	$ 205,000
Foreign Tax Authority [Member] | Ministry of the Economy, Finance and Industry, France [Member]
National Corporate Tax Rate														34.43%
Corporate Income Tax Rate, Taxable Income Exceeding Euro 0.5 Million												31.00%	33.30%
Foreign Tax Authority [Member] | Ministry of the Economy, Finance and Industry, France [Member] | Forecast [Member]
National Corporate Tax Rate									25.00%	26.50%	28.00%
Foreign Tax Authority [Member] | Sistema de Administración de Rentas [Member]
Income Taxes Exempt Period												10 years
Foreign Tax Authority [Member] | Minimum [Member] | Kenya Revenue Authority [Member]
Tax Losses Carryforward Period												5 years
Foreign Tax Authority [Member] | Maximum [Member] | Kenya Revenue Authority [Member]
Tax Losses Carryforward Period												10 years
State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Total				277,900								$ 277,900
Operating Loss Carryforwards Expiring Amount				275,500								275,500
Operating Loss Carryforwards Available For Indefinite Period				2,400								2,400
Deferred Tax Assets, Investments				$ 800								$ 800
Open Tax Year												2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019
State and Local Jurisdiction [Member] | U.S. Geothermal [Member]
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets		$ 49,900
State and Local Jurisdiction [Member] | Minimum [Member]
Tax Credit Carryforward Expiration Year												2025
State and Local Jurisdiction [Member] | Maximum [Member]
Tax Credit Carryforward Expiration Year												2039
[1]	The non-current deferred tax asset has been reduced by the uncertain tax benefit of $0.1 million in accordance with ASU 2013-11, Income Taxes.

Note 18 - Income Taxes - Income

Note 18 - Income Taxes - Income From Continuing Operations Before Income Taxes and Equity in Income (Losses) of Investees (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
U.S									$ 14,187	$ 14,097	$ 13,680
Non-U.S. (foreign)									123,116	123,084	157,050
Income from operations before income tax and equity in earnings (losses) of investees	$ 41,085	$ 23,630	$ 31,466	$ 41,122	$ 48,293	$ 11,408	$ 31,376	$ 46,104	$ 137,303	$ 137,181	$ 170,730

Note 18 - Income Taxes - Compon

Note 18 - Income Taxes - Components of Income Tax Provision (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current:
Federal									$ 0	$ 0	$ 43,935
State									172	381	43
Foreign									16,969	14,992	11,186
Total current income tax expense									17,141	15,373	55,164
Deferred:
Federal									(12,179)	(6,886)	(55,718)
State									4,671	(2,595)	(3,284)
Foreign									35,980	28,841	25,502
Total deferred tax provision (benefit)									28,472	19,360	(33,500)
Total Income tax provision	$ 25,477	$ 9,626	$ (3,529)	$ 14,039	$ 31,386	$ 1,184	$ 29,105	$ (26,942)	$ 45,613	$ 34,733	$ 21,664

Note 18 - Income Taxes - Differ

Note 18 - Income Taxes - Difference Between US Federal Statutory Tax Rate and Company's Effective Tax Rate (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
U.S. federal statutory tax rate	21.00%	21.00%	35.00%
Impact of federal tax reform	0.00%	2.60%	(12.40%)
Transition tax inclusion		(5.70%)	42.10%
Foreign tax credits	(22.80%)	(4.20%)	(50.50%)
Withholding tax	10.40%	5.90%	34.10%
State income tax, net of federal benefit	3.70%	1.00%	1.10%
Uncertain tax positions	2.10%	2.10%
Effect of foreign income tax, net	9.70%	5.60%	(10.70%)
Production tax credits	(5.00%)	(3.10%)	(1.20%)
Subpart F income	0.50%	0.50%	1.70%
Tax on global intangible low-tax income	16.90%	18.60%
Intra-entity transfers of assets other than inventory	0.30%	(2.10%)
Other, net	0.10%	0.30%	(3.90%)
Effective tax rate	33.20%	25.30%	12.70%
Domestic Tax Authority [Member]
Valuation allowance	(3.70%)	(17.20%)	(22.60%)

Note 18 - Income Taxes - Net De

Note 18 - Income Taxes - Net Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Deferred tax assets (liabilities):
Net foreign deferred taxes, primarily depreciation	$ (88,508)	$ (57,202)
Depreciation, deferred tax liability	(21,958)	(30,500)
Intangible drilling costs, liability	(1,405)
Intangible drilling costs, asset		7,370
Net operating loss carryforward - U.S.	45,307	65,020
Tax monetization transaction	(30,964)	(17,104)
Right-of-use assets	(3,715)	0
Lease liabilities	3,755	0
State and Investment tax credits	813	813
Production tax credits	100,524	90,913
Foreign tax credits	92,497	58,072
Withholding tax	(15,539)	(8,052)
Stock options amortization	1,409	1,440
Basis difference in partnership interest	(39,622)	(36,516)
Excess business interest	6,189	0
Accrued liabilities and other	1,013	624
	49,796	74,878
Less - valuation allowance	(17,412)	(22,441)	$ (77,571)	$ (116,234)
Total	$ 32,384	$ 52,437

Note 18 - Income Taxes - Reconc

Note 18 - Income Taxes - Reconciliation of Beginning and Ending Valuation Allowance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019
Balance at beginning of the year	$ 22,441	$ 77,571	$ 116,234
Additions to valuation allowance	15,437	4,747	46,560
Release of valuation allowance	(20,466)	(59,877)	(85,223)
Balance at end of the year	$ 22,441	$ 77,571	$ 116,234	$ 17,412

Note 18 - Income Taxes - Balanc

Note 18 - Income Taxes - Balance Sheet Presentation of Deferred Taxes (Details) - USD ($) $ in Thousands		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Non-current deferred tax assets		$ 129,510	$ 113,760	$ 57,337
Non-current deferred tax liabilities		(97,126)	(61,323)	(61,961)
Non-current deferred tax assets, net		32,384	52,437
Non-current deferred tax liabilities, net				(4,624)
Uncertain tax benefit offset (1)	[1]	(95)	(95)	(95)
		$ 32,289	$ 52,342	$ (4,719)
[1]	The non-current deferred tax asset has been reduced by the uncertain tax benefit of $0.1 million in accordance with ASU 2013-11, Income Taxes.

Note 18 - Income Taxes - Reco_2

Note 18 - Income Taxes - Reconciliation of Beginning and Ending Amounts of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Balance at beginning of year	$ 8,820	$ 6,357	$ 4,609
Additions based on tax positions taken in prior years	104	293	5
Additions based on tax positions taken in the current year	2,314	2,446	2,580
Reduction based on tax positions taken in prior years	(615)	(276)	(837)
Balance at end of year	$ 10,623	$ 8,820	$ 6,357

Note 18 - Income Taxes - Foreig

Note 18 - Income Taxes - Foreign Subsidiaries Income Tax Years Open to Examination (Details)	12 Months Ended
	Dec. 31, 2019
Earliest Tax Year [Member] | ISRAEL
Countries	2015
Earliest Tax Year [Member] | KENYA
Countries	2013
Earliest Tax Year [Member] | GUATEMALA
Countries	2015
Earliest Tax Year [Member] | HONDURAS
Countries	2015
Earliest Tax Year [Member] | GUADELOUPE
Countries	2017
Earliest Tax Year [Member] | NEW ZEALAND
Countries	2012
Latest Tax Year [Member] | ISRAEL
Countries	2019
Latest Tax Year [Member] | KENYA
Countries	2019
Latest Tax Year [Member] | GUATEMALA
Countries	2019
Latest Tax Year [Member] | HONDURAS
Countries	2019
Latest Tax Year [Member] | GUADELOUPE
Countries	2019
Latest Tax Year [Member] | NEW ZEALAND
Countries	2019

Note 19 - Business Segments (De

Note 19 - Business Segments (Details Textual) $ in Thousands		12 Months Ended
		Dec. 31, 2019USD ($)	Dec. 31, 2018USD ($)	Dec. 31, 2017USD ($)
Number of Reportable Segments		3
Revenue from Contract with Customer, Including Assessed Tax	[1]	$ 746,044	$ 719,267	$ 692,812
Goodwill, Ending Balance		20,140	19,950	21,037
Electricity Segment [Member]
Revenue from Contract with Customer, Including Assessed Tax		540,333	509,879	465,593
Goodwill, Ending Balance		20,100	20,000	7,600
Electricity Segment [Member] | Accounting Standards Update 2014-09 [Member]
Revenue from Contract with Customer, Including Assessed Tax		61,300	26,900
Product and Energy Storage and Management Services Segments [Member]
Goodwill, Ending Balance		$ 0	$ 0	$ 13,500
[1]	Revenues as reported in the geographic area in which they originate.

Note 19 - Business Segments - S

Note 19 - Business Segments - Summarized Financial Information Concerning Reportable Segments (Details) - USD ($) $ in Thousands		3 Months Ended										12 Months Ended
		Dec. 31, 2019		Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018		Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017
Revenues	[1]											$ 746,044		$ 719,267		$ 692,812
Depreciation and amortization expense												148,761		132,233		115,146
Operating income (loss)		$ 54,472		$ 38,719	$ 46,880	$ 53,725	$ 67,982		$ 25,902	$ 36,633	$ 54,593	193,796		185,110		205,018
Segment assets at period end	[2]	3,250,494	[3]				3,121,350	[4]				3,250,494	[3]	3,121,350	[4]	2,623,864	[4]
Expenditures for long-lived assets												279,986		258,521		259,234
Intersegment Eliminations [Member]
Revenues												84,614		48,817		109,040
Segment Reconciling Items [Member]
Segment assets at period end		81,140					71,983					81,140		71,983		34,084
Electricity Segment [Member]
Revenues												540,333		509,879		465,593
Depreciation and amortization expense												138,426		126,181		109,928
Operating income (loss)												177,192		155,546		157,613
Segment assets at period end	[2]	3,044,909	[3]				2,896,938	[4]				3,044,909	[3]	2,896,938	[4]	2,457,514	[4]
Expenditures for long-lived assets												259,898		219,803		252,581
Electricity Segment [Member] | Intersegment Eliminations [Member]
Revenues												0		0		0
Electricity Segment [Member] | Segment Reconciling Items [Member]
Segment assets at period end		81,140					71,983					81,140		71,983		34,084
Product Segment [Member]
Revenues												191,009		201,743		224,483
Depreciation and amortization expense												5,308		4,311		3,470
Operating income (loss)												23,180		38,083		50,543
Segment assets at period end	[2]	126,018	[3]				156,942	[4]				126,018	[3]	156,942	[4]	115,713	[4]
Expenditures for long-lived assets												9,156		9,993		6,653
Product Segment [Member] | Intersegment Eliminations [Member]
Revenues												84,614		48,817		109,040
Product Segment [Member] | Segment Reconciling Items [Member]
Segment assets at period end		0					0					0		0		0
Other Segments [Member]
Revenues												14,702		7,645		2,736
Depreciation and amortization expense												5,027		1,741		1,748
Operating income (loss)												(6,576)		(8,519)		(3,138)
Segment assets at period end	[2]	79,567	[3]				67,470	[4]				79,567	[3]	67,470	[4]	50,637	[4]
Expenditures for long-lived assets												10,932		28,725		0
Other Segments [Member] | Intersegment Eliminations [Member]
Revenues												0		0		0
Other Segments [Member] | Segment Reconciling Items [Member]
Segment assets at period end		$ 0					$ 0					0		0		0
UNITED STATES
Revenues	[1]											377,956	[5]	328,606	[5]	$ 301,132
UNITED STATES | Electricity Segment [Member]
Revenues	[5]											333,797		305,962
UNITED STATES | Product Segment [Member]
Revenues	[5]											30,562		14,999
UNITED STATES | Other Segments [Member]
Revenues	[5]											13,597		7,645
Non-US [Member]
Revenues	[6]											368,088		390,661
Non-US [Member] | Electricity Segment [Member]
Revenues	[6]											206,536		203,917
Non-US [Member] | Product Segment [Member]
Revenues	[6]											160,447		186,744
Non-US [Member] | Other Segments [Member]
Revenues	[6]											$ 1,105		$ 0
[1]	Revenues as reported in the geographic area in which they originate.
[2]	Electricity segment assets include goodwill in the amount of $20.1 million, $20.0 million and $7.6 as of December 31, 2019, 2018 and 2017, respectively. No goodwill is included in the Product and Energy Storage and Management Services segment assets as of December 31, 2019 and 2018. Energy Storage and Management Services segment assets as December 31, 2017 include goodwill in the amount of $13.5 million. For further information on goodwill, see Note 9 - Intangible assets and goodwill to the consolidated financial statements.
[3]	Including unconsolidated investments 81,140 — — 81,140
[4]	Including unconsolidated investments 34,084 — — 34,084
[5]	Electricity segment revenues in the United States are all accounted under lease accounting, except for $61.3 million and $26.9 million for the years December 31, 2019 and 2018 that are accounted under ASC 606 starting in 2018. Product and Energy Storage and Management Services segment revenues in the United States are accounted under ASC 606, as further described under Note 1 to the consolidated financial statements.
[6]	Electricity segment revenues in foreign countries are all accounted under lease accounting. Product and Energy Storage and Management Services segment revenues in foreign countries are accounted under ASC 606 as further described under Note 1 to the consolidated financial statements.

Note 19 - Business Segments - R

Note 19 - Business Segments - Reconciling Information Between Reportable Segments and Consolidated Totals (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue	[1]									$ 746,044	$ 719,267	$ 692,812
Operating income (loss)		$ 54,472	$ 38,719	$ 46,880	$ 53,725	$ 67,982	$ 25,902	$ 36,633	$ 54,593	193,796	185,110	205,018
Interest income		320	482	420	293	458	214	189	113	1,515	974	988
Interest expense, net		(17,568)	(20,076)	(21,517)	(21,223)	(22,034)	(18,700)	(15,846)	(14,344)	(80,384)	(70,924)	(54,142)
Derivatives and foreign currency transaction gains (losses)		(72)	205	19	472	(2,250)	(383)	(529)	(1,599)	624	(4,761)	2,654
Income attributable to sale of tax benefits		4,415	4,056	4,637	7,764	4,020	4,066	3,556	7,361	20,872	19,003	17,878
Other non-operating income (expense), net		(482)	244	1,027	91	117	309	7,373	(20)	880	7,779	(1,666)
Income from operations before income tax and equity in earnings (losses) of investees		$ 41,085	$ 23,630	$ 31,466	$ 41,122	$ 48,293	$ 11,408	$ 31,376	$ 46,104	137,303	137,181	170,730
Intersegment Eliminations [Member]
Revenue										84,614	48,817	109,040
Consolidation, Eliminations [Member]
Revenue										$ (84,614)	$ (48,817)	$ (109,040)
[1]	Revenues as reported in the geographic area in which they originate.

Note 19 - Business Segments -_2

Note 19 - Business Segments - Revenues as Reported in the Geographic Area (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017
Revenue	[1]	$ 746,044		$ 719,267		$ 692,812
UNITED STATES
Revenue	[1]	377,956	[2]	328,606	[2]	301,132
INDONESIA
Revenue	[1]	0		4,379		28,968
KENYA
Revenue	[1]	121,661		119,094		110,243
TURKEY
Revenue	[1]	88,938		168,699		125,166
CHILE
Revenue	[1]	25,540		980		8,895
GUATEMALA
Revenue	[1]	28,624		27,975		27,991
NEW ZEALAND
Revenue	[1]	31,222		10,451		33,395
HONDURAS
Revenue	[1]	34,446		34,355		10,151
Other Foreign Countries [Member]
Revenue	[1]	$ 37,657		$ 24,728		$ 46,871
[1]	Revenues as reported in the geographic area in which they originate.
[2]	Electricity segment revenues in the United States are all accounted under lease accounting, except for $61.3 million and $26.9 million for the years December 31, 2019 and 2018 that are accounted under ASC 606 starting in 2018. Product and Energy Storage and Management Services segment revenues in the United States are accounted under ASC 606, as further described under Note 1 to the consolidated financial statements.

Note 19 - Business Segments - L

Note 19 - Business Segments - Long Lived Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Long Lived Assets, Geographic Area	$ 2,379,537	$ 2,221,267	$ 2,133,289
UNITED STATES
Long Lived Assets, Geographic Area	1,870,335	1,696,439	1,510,986
KENYA
Long Lived Assets, Geographic Area	284,526	301,956	340,970
Other Foreign Countries [Member]
Long Lived Assets, Geographic Area	$ 224,676	$ 222,872	$ 281,333

Note 19 - Business Segments -_3

Note 19 - Business Segments - Revenue From Major Customers (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue	[1]	$ 746,044	$ 719,267	$ 692,812
Southern California Public Power Authority [Member]
Revenue	[2]	$ 133,725	$ 109,208	$ 70,100
Percentage of revenues	[2]	17.90%	15.20%	10.10%
Sierra Pacific Power Company And Nevada Power Company [Member]
Revenue	[2],[3]	$ 125,486	$ 116,149	$ 125,424
Percentage of revenues	[2],[3]	16.80%	16.10%	18.10%
Kenya Power and Lighting Co LTD [Member]
Revenue	[2]	$ 121,661	$ 119,094	$ 110,243
Percentage of revenues	[2]	16.30%	16.60%	15.90%
[1]	Revenues as reported in the geographic area in which they originate.
[2]	Revenues reported in Electricity segment.
[3]	Subsidiaries of NV Energy, Inc.

Note 21 - Employee Benefit Pl_3

Note 21 - Employee Benefit Plan (Details Textual) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	60.00%
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay	4.00%	4.00%	3.00%
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 1,600	$ 1,600	$ 1,400
Deposits And Other Assets Noncurrent	38,284	18,209
Severance Costs	3,500	3,000	3,200
Gain (Loss) Of Severance Fund	1,000	(1,100)	$ 1,800
Israeli Severance Funds [Member]
Deposits And Other Assets Noncurrent	$ 10,800	$ 10,600

Note 21 - Employee Benefit Pl_4

Note 21 - Employee Benefit Plan - Expected Future Benefit Payments (Details) $ in Thousands	Dec. 31, 2019USD ($)
2020	$ 4,780
2021	1,434
2022	1,768
2023	89
2024	500
2025-2043	11,232
Total	$ 19,803

Note 22 - Commitments and Con_2

Note 22 - Commitments and Contingencies (Details Textual) - USD ($) $ in Millions	Mar. 29, 2016	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Letters of Credit Outstanding, Amount		$ 213.8
Recorded Unconditional Purchase Obligation, Total		185
Royalty Cap Amount		2.1	$ 2
Royalty Cap Amount LIBOR Rate		$ 1.1	1
Former Local Sales Representative vs. Ormat [Member] | Pending Litigation [Member]
Loss Contingency, Damages Sought, Value	$ 4.6
Loss Contingency, Additional Damages Sought for Ormat Geothermal Products Sales in Chile, Percent	3.75%
Loss Contingency, Damages Sought, Ormat Geothermal Products Sales in Chile, Period	10 years
Minimum [Member]
Percentage For Royalty To Be Paid		3.50%
Maximum [Member]
Percentage For Royalty To Be Paid		5.00%
Construction In Process [Member]
Recorded Unconditional Purchase Obligation, Total		$ 59.5
Geothermal Resource Agreement [Member]
Royalty Expense		$ 21.7	$ 21.6	$ 19.4

Note 23 - Leases - Lessee's Tot

Note 23 - Leases - Lessee's Total Lease Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Lease cost
Amortization of right-of-use assets	$ 3,273
Interest on lease liabilities	1,330
Operating lease cost	8,057
Variable lease cost	1,647
Short-term lease cost	0
Total lease cost	14,307
Operating cash flows for finance leases	1,330
Operating cash flows for operating leases	9,004
Financing cash flows for finance leases	3,164	$ 2,551	$ 1,871
Right-of-use assets obtained in exchange for new finance lease liabilities	5,262
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 6,364
Weighted-average remaining lease term — finance leases (in years) (Year)	4 years
Weighted-average remaining lease term — operating leases (in years) (Year)	7 years 3 months 18 days
Weighted-average discount rate (in percentage)	5.00%

Note 23 - Leases - Lessee Futur

Note 23 - Leases - Lessee Future Minimum Lease Payments (Details) $ in Thousands	Dec. 31, 2019USD ($)
2020, operating leases	$ 2,742
2020, finance leases	4,251
2021, operating leases	2,701
2021, finance leases	3,948
2022, operating leases	2,079
2022, finance leases	3,873
2023, operating leases	1,524
2023, finance leases	2,758
2024, operating leases	1,275
2024, finance leases	906
Thereafter, operating leases	10,635
Thereafter, finance leases	4,118
Total future minimum lease payments, operating leases	20,956
Total future minimum lease payments, finance leases	19,854
Less imputed interest, operating leases	4,205
Less imputed interest, finance leases	5,577
Total, operating leases	16,751
Total, finance leases	$ 14,277

Note 23 - Leases - Future Minim

Note 23 - Leases - Future Minimum Lease Payments Under Non-cancellable Leases (Details) $ in Thousands	Dec. 31, 2018USD ($)
2019	$ 10,889
2020	7,515
2021	5,758
2022	4,415
2023	2,910
Thereafter	9,292
Total	$ 40,779

Note 23 - Leases - Lease Income

Note 23 - Leases - Lease Income Recognized (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019USD ($)
Lease income relating to lease payments of operating leases	$ 479,059
Lease income relating to variable lease payments not included in the measurement of the lease	0
Total	$ 479,059

Note 24 - Quarterly Financial_3

Note 24 - Quarterly Financial Information (Unaudited) - Quarterly Financial Information (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue	[1]									$ 746,044	$ 719,267	$ 692,812
Revenues		$ 192,442	$ 170,499	$ 184,065	$ 199,038	$ 190,465	$ 166,480	$ 178,299	$ 184,023
Cost of revenues		117,940	115,004	118,918	124,859	99,656	117,688	120,837	110,651	476,721	448,832	424,360
Gross profit		74,502	55,495	65,147	74,179	90,809	48,792	57,462	73,372	269,323	270,435	268,452
Research and development expenses		1,875	1,062	810	900	1,118	706	1,251	1,108	4,647	4,183	3,157
Selling and marketing expenses		4,123	3,783	3,276	3,865	3,813	8,578	3,712	3,699	15,047	19,802	15,600
General and administrative expenses		14,032	11,931	14,181	15,689	4,429	13,606	15,866	13,849	55,833	47,750	42,881
Impairment charge		0	0	0	0	13,464	0	0	0	0	13,464	0
Write-off of unsuccessful exploration activities		0	0	0	0	3	0	0	123	0	126	1,796
Operating income (loss)		54,472	38,719	46,880	53,725	67,982	25,902	36,633	54,593	193,796	185,110	205,018
Interest income		320	482	420	293	458	214	189	113	1,515	974	988
Interest expense, net		(17,568)	(20,076)	(21,517)	(21,223)	(22,034)	(18,700)	(15,846)	(14,344)	(80,384)	(70,924)	(54,142)
Derivatives and foreign currency transaction gains (losses)		(72)	205	19	472	(2,250)	(383)	(529)	(1,599)	624	(4,761)	2,654
Income attributable to sale of tax benefits		4,415	4,056	4,637	7,764	4,020	4,066	3,556	7,361	20,872	19,003	17,878
Other non-operating income (expense), net		(482)	244	1,027	91	117	309	7,373	(20)	880	7,779	(1,666)
Income from operations before income tax and equity in earnings (losses) of investees		41,085	23,630	31,466	41,122	48,293	11,408	31,376	46,104	137,303	137,181	170,730
Income tax (provision) benefit		(25,477)	(9,626)	3,529	(14,039)	(31,386)	(1,184)	(29,105)	26,942	(45,613)	(34,733)	(21,664)
Equity in earnings (losses) of investees, net		(1,481)	1,085	1,202	1,047	6,182	(117)	388	1,210	1,853	7,663	(1,957)
Net income		14,127	15,089	36,197	28,130	23,089	10,107	2,659	74,256
Net loss (income) attributable to noncontrolling interest		(1,521)	516	(2,259)	(2,184)	(4,869)	474	(3,002)	(4,748)	(5,448)	(12,145)	(14,695)
Net income (loss) attributable to the Company's stockholders		$ 12,606	$ 15,605	$ 33,938	$ 25,946	$ 18,220	$ 10,581	$ (343)	$ 69,508	$ 88,095	$ 97,966	$ 132,414
Net income (in dollars per share)		$ 0.25	$ 0.31	$ 0.67	$ 0.51	$ 0.36	$ 0.21	$ (0.01)	$ 1.37	$ 1.73	$ 1.93	$ 2.64
Net income (in dollars per share)		$ 0.24	$ 0.30	$ 0.66	$ 0.51	$ 0.36	$ 0.21	$ (0.01)	$ 1.36	$ 1.72	$ 1.92	$ 2.61
Basic (in shares)		51,017	50,933	50,800	50,709	50,691	50,645	50,623	50,614	50,867	50,643	50,110
Diluted (in shares)		51,511	51,334	51,094	51,012	50,936	50,963	50,958	51,051	51,227	50,969	50,769
Electricity [Member]
Revenue		$ 144,368	$ 123,978	$ 129,079	$ 142,908	$ 138,320	$ 116,891	$ 122,179	$ 132,489	$ 540,333	$ 509,879	$ 465,593
Cost of revenues		81,393	80,124	73,775	77,543	63,692	79,845	81,236	73,482	312,835	298,255	266,840
Product [Member]
Revenue		43,814	43,037	52,030	52,128	49,717	48,439	54,915	48,672	191,009	201,743	224,483
Cost of revenues		31,479	31,073	41,316	42,106	33,729	35,669	37,573	33,726	145,974	140,697	152,094
Energy Storage and Management Services [Member]
Revenue		4,260	3,484	2,956	4,002	2,428	1,150	1,205	2,862	14,702	7,645	2,736
Cost of revenues		$ 5,068	$ 3,807	$ 3,827	$ 5,210	$ 2,235	$ 2,174	$ 2,028	$ 3,443	$ 17,912	$ 9,880	$ 5,426
[1]	Revenues as reported in the geographic area in which they originate.

Note 25 - Subsequent Events (De

Note 25 - Subsequent Events (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	Feb. 26, 2020	Jun. 30, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Dividends, Common Stock, Total			$ 22,386	$ 26,834	$ 20,511
Common Stock, Dividends, Per Share, Declared			$ 0.44	$ 0.53	$ 0.44
AltaGas Power Holdings [Member] | Forecast [Member]
Payments to Acquire Businesses, at Closing		$ 51,000
AltaGas Power Holdings [Member] | Forecast [Member] | Maximum [Member]
Payments to Acquire Businesses, Gross		$ 65,000
Subsequent Event [Member]
Dividends, Common Stock, Total	$ 5,600
Common Stock, Dividends, Per Share, Declared	$ 0.11