Ormat (ORA) 10-Q 6 Aug 20 2020 Q2 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2020	Jul. 31, 2020
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	Q2
Document Fiscal Year Focus	2020
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2020
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
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 Common Stock, Shares Outstanding		51,067,163
Title of 12(b) Security	Common Stock
Trading Symbol	ORA
Security Exchange Name	NYSE

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands		Jun. 30, 2020		Dec. 31, 2019
Current assets:
Cash and cash equivalents		$ 173,718		$ 71,173
Restricted cash and cash equivalents (primarily related to VIEs)		76,116		81,937
Receivables:
Trade less allowance for credit losses of $779 and $0, respectively (primarily related to VIEs)		179,757		154,525
Other		18,121		22,048
Inventories		38,932		34,949
Costs and estimated earnings in excess of billings on uncompleted contracts	[1]	19,477		38,365
Prepaid expenses and other		10,948		12,667
Total current assets		517,069		415,664
Investment in unconsolidated companies		84,414		81,140
Deposits and other		37,278		38,284
Deferred income taxes		116,758		129,510
Property, plant and equipment, net		2,038,038		1,971,415
Construction-in-process		394,123		376,555
Operating leases right of use		17,638		17,405
Finance leases right of use		13,280		14,161
Intangible assets, net		179,659		186,220
Goodwill		20,120		20,140
Total assets		3,418,377	[2],[3]	3,250,494
Current liabilities:
Accounts payable and accrued expenses		149,591		141,857
Short term revolving credit lines with banks (full recourse)		100,057		40,550
Commercial paper		3,775		50,000
Billings in excess of costs and estimated earnings on uncompleted contracts		5,599		2,755
Current portion of long-term debt:
Senior secured notes		28,544		24,473
Other loans		34,341		34,458
Full recourse		76,572		76,572
Operating lease liabilities		3,016		2,743
Finance lease liabilities		3,151		3,068
Total current liabilities		404,646		376,476
Long-term debt, net of current portion:
Senior secured notes (less deferred financing costs of $5,802 and $6,317, respectively)		325,714		339,336
Other loans (less deferred financing costs of $9,514 and $10,482, respectively)		301,318		317,395
Senior unsecured bonds (less deferred financing costs of $929 and $675, respectively)		415,751		286,453
Other loans (less deferred financing costs of $1,430 and $1,519, respectively)		64,150		68,747
Operating lease liabilities		14,201		14,008
Finance lease liabilities		10,523		11,209
Liability associated with sale of tax benefits		118,072		123,468
Deferred income taxes		104,013		97,126
Liability for unrecognized tax benefits		15,309		14,643
Liabilities for severance pay		18,835		18,751
Asset retirement obligation		51,414		50,183
Other long-term liabilities		7,814		8,039
Total liabilities		1,851,760		1,725,834
Redeemable noncontrolling interest		9,806		9,250
Equity:
Common stock, par value $0.001 per share; 200,000,000 shares authorized; 51,067,163 and 51,031,652 issued and outstanding as of June 30, 2020 and December 31, 2019, respectively		51		51
Additional paid-in capital		917,403		913,150
Retained earnings		524,864		487,873
Accumulated other comprehensive income (loss)		(13,921)		(8,654)
Total stockholders' equity attributable to Company's stockholders		1,428,397		1,392,420
Noncontrolling interest		128,414		122,990
Total equity		1,556,811		1,515,410
Total liabilities, redeemable noncontrolling interest and equity		$ 3,418,377		$ 3,250,494
[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 six months ended June 30, 2020 as a result of performance obligations satisfied.
[2]	* Including unconsolidated investments 84,414 - - 84,414
[3]	Electricity segment assets include goodwill in the amount of $20.1 million and $20.2 million as of June 30, 2020 and 2019, respectively. No goodwill is included in the Product and ESMS segment assets as of June 30, 2020 and 2019.

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Trade, allowance for credit losses	$ 779,000	$ 0
Property, plant and equipment, net	2,038,038,000	1,971,415,000
Construction-in-process	394,123,000	376,555,000
Operating leases right of use	17,638,000	17,405,000
Finance leases right of use	$ 13,280,000	$ 14,161,000
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)	51,067,163	51,031,652
Common stock, shares outstanding (in shares)	51,067,163	51,031,652
Senior Secured Notes [Member]
Deferred financing costs	$ 5,802,000	$ 6,317,000
Other Loans, Limited and Non-recourse [Member]
Deferred financing costs	9,514,000	10,482,000
Senior Unsecured Bonds [Member]
Deferred financing costs	929,000	675,000
Other Loans, Full Recourse [Member]
Deferred financing costs	1,430,000	1,519,000
Variable Interest Entity, Primary Beneficiary [Member]
Property, plant and equipment, net	1,931,033	1,880,547
Construction-in-process	182,813	149,830
Operating leases right of use	5,527,000	4,688,000
Finance leases right of use	$ 8,117,000	$ 8,479,000

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenues:
Revenue	$ 174,900	$ 184,065	$ 367,013	$ 383,103
Cost of revenues:
Cost of revenues	109,514	118,918	219,809	243,777
Gross profit	65,386	65,147	147,204	139,326
Operating expenses:
Research and development expenses	1,172	810	2,791	1,710
Selling and marketing expenses	4,854	3,276	9,648	7,141
General and administrative expenses	11,285	14,181	25,633	29,870
Operating income	48,075	46,880	109,132	100,605
Other income (expense):
Interest income	441	420	843	713
Interest expense, net	(19,785)	(21,517)	(37,058)	(42,740)
Derivatives and foreign currency transaction gains (losses)	671	19	1,064	491
Income attributable to sale of tax benefits	5,672	4,637	9,804	12,401
Other non-operating income (expense), net	304	1,027	382	1,118
Income from operations before income tax and equity in earnings (losses) of investees	35,378	31,466	84,167	72,588
Income tax (provision) benefit	(11,766)	3,529	(29,914)	(10,510)
Equity in earnings (losses) of investees, net	1,658	1,202	923	2,249
Net income	25,270	36,197	55,176	64,327
Net income attributable to noncontrolling interest	(2,224)	(2,259)	(6,097)	(4,443)
Net income attributable to the Company's stockholders	23,046	33,938	49,079	59,884
Comprehensive income:
Net income	25,270	36,197	55,176	64,327
Other comprehensive income (loss), net of related taxes:
Change in foreign currency translation adjustments	921	482	276	(866)
Change in unrealized gains or losses in respect of the Company's share in derivatives instruments of unconsolidated investment	(653)	(2,087)	(5,408)	(3,232)
Change in respect of derivative instruments designated for cash flow hedge	17	18	30	40
Amortization of unrealized gains in respect of derivative instruments designated for cash flow hedge	(5)	(9)	(13)	(17)
Comprehensive income	25,550	34,601	50,061	60,252
Comprehensive income attributable to noncontrolling interest	(2,763)	(2,443)	(6,249)	(4,305)
Comprehensive income attributable to the Company's stockholders	$ 22,787	$ 32,158	$ 43,812	$ 55,947
Basic:
Net income (in dollars per share)	$ 0.45	$ 0.67	$ 0.96	$ 1.18
Diluted:
Net income (in dollars per share)	$ 0.45	$ 0.66	$ 0.95	$ 1.17
Weighted average number of shares used in computation of earnings per share attributable to the Company's stockholders:
Basic (in shares)	51,043	50,800	51,040	50,757
Diluted (in shares)	51,362	51,094	51,448	51,058
Electricity [Member]
Revenues:
Revenue	$ 128,685	$ 129,079	$ 271,541	$ 271,987
Cost of revenues:
Cost of revenues	71,950	73,775	143,318	151,318
Product [Member]
Revenues:
Revenue	43,701	52,030	91,112	104,158
Cost of revenues:
Cost of revenues	34,709	41,316	71,687	83,422
Energy Storage and Management Services [Member]
Revenues:
Revenue	2,514	2,956	4,360	6,958
Cost of revenues:
Cost of revenues	$ 2,855	$ 3,827	$ 4,804	$ 9,037

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Cumulative Effect, Period of Adoption, Adjustment [Member]Common Stock [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]Additional Paid-in Capital [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]Retained Earnings [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]AOCI Attributable to Parent [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]Parent [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]Noncontrolling Interest [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]	Cumulative Effect, Period of Adoption, Adjusted Balance [Member]Common Stock [Member]	Cumulative Effect, Period of Adoption, Adjusted Balance [Member]Additional Paid-in Capital [Member]	Cumulative Effect, Period of Adoption, Adjusted Balance [Member]Retained Earnings [Member]	Cumulative Effect, Period of Adoption, Adjusted Balance [Member]AOCI Attributable to Parent [Member]	Cumulative Effect, Period of Adoption, Adjusted Balance [Member]Parent [Member]	Cumulative Effect, Period of Adoption, Adjusted Balance [Member]Noncontrolling Interest [Member]	Cumulative Effect, Period of Adoption, Adjusted Balance [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, 2018	50,700														50,700
Balance at Dec. 31, 2018	$ 0	$ 0	$ (58)	$ 0	$ (58)	$ 0	$ (58)	$ 51	$ 901,363	$ 422,164	$ (3,799)	$ 1,319,779	$ 125,259	$ 1,445,038	$ 51	$ 901,363	$ 422,222	$ (3,799)	$ 1,319,837	$ 125,259	$ 1,445,096
Stock-based compensation															$ 0	2,360	0	0	2,360	0	2,360
Exercise of options by employees and directors (in shares)															52
Exercise of options by employees and directors															$ 0	0	0	0	0	0	0
Cash paid to noncontrolling interest															0	0	0	0	0	(4,146)	(4,146)
Cash dividend declared															0	0	(5,579)	0	(5,579)	0	(5,579)
Net income															0	0	25,946	0	25,946	1,855	27,801
Change in foreign currency translation adjustments															0	0	0	(1,026)	(1,026)	(322)	(1,348)
Change in respect of derivative instruments designated for cash flow hedge															0	0	0	22	22	0	22
Change in unrealized gains or losses in respect of the Company's share in derivative instruments of unconsolidated investment															0	0	0	(1,145)	(1,145)	0	(1,145)
Amortization of unrealized gains in respect of derivative instruments designated for cash flow hedge															$ 0	0	0	(8)	(8)	0	(8)
Balance (in shares) at Mar. 31, 2019															50,752
Balance at Mar. 31, 2019															$ 51	903,723	442,531	(5,956)	1,340,349	122,646	1,462,995
Balance (in shares) at Dec. 31, 2018	50,700														50,700
Balance at Dec. 31, 2018	$ 0	0	(58)	0	(58)	0	(58)	51	901,363	422,164	(3,799)	1,319,779	125,259	1,445,038	$ 51	901,363	422,222	(3,799)	1,319,837	125,259	1,445,096
Change in foreign currency translation adjustments																					(866)
Balance (in shares) at Jun. 30, 2019															50,862
Balance at Jun. 30, 2019															$ 51	906,366	470,880	(7,736)	1,369,561	122,080	1,491,641
Balance (in shares) at Mar. 31, 2019															50,752
Balance at Mar. 31, 2019															$ 51	903,723	442,531	(5,956)	1,340,349	122,646	1,462,995
Stock-based compensation															$ 0	2,643	0	0	2,643	0	2,643
Exercise of options by employees and directors (in shares)															110
Exercise of options by employees and directors															$ 0	0	0	0	0	0	0
Cash paid to noncontrolling interest															0	0	0	0	0	(2,767)	(2,767)
Cash dividend declared															0	0	(5,589)	0	(5,589)	0	(5,589)
Net income															0	0	33,938	0	33,938	2,017	35,955
Change in foreign currency translation adjustments															0	0	0	298	298	184	482
Change in respect of derivative instruments designated for cash flow hedge															0	0	0	18	18	0	18
Change in unrealized gains or losses in respect of the Company's share in derivative instruments of unconsolidated investment															0	0	0	(2,087)	(2,087)	0	(2,087)
Amortization of unrealized gains in respect of derivative instruments designated for cash flow hedge															$ 0	0	0	(9)	(9)	0	(9)
Balance (in shares) at Jun. 30, 2019															50,862
Balance at Jun. 30, 2019															$ 51	906,366	470,880	(7,736)	1,369,561	122,080	1,491,641
Balance (in shares) at Dec. 31, 2019	51,032														51,032
Balance at Dec. 31, 2019	$ 0	0	(755)	0	(755)	0	(755)	51	913,150	487,118	(8,654)	1,391,665	122,990	1,514,655	$ 51	913,150	487,873	(8,654)	1,392,420	122,990	1,515,410
Stock-based compensation															$ 0	1,989	0	0	1,989	0	1,989
Exercise of options by employees and directors (in shares)															4
Exercise of options by employees and directors															$ 0	0	0	0	0	0	0
Cash paid to noncontrolling interest															0	0	0	0	0	(3,007)	(3,007)
Cash dividend declared															0	0	(5,614)	0	(5,614)	0	(5,614)
Net income															0	0	26,033	0	26,033	3,543	29,576
Change in foreign currency translation adjustments															0	0	0	(258)	(258)	(387)	(645)
Change in respect of derivative instruments designated for cash flow hedge															0	0	0	13	13	0	13
Change in unrealized gains or losses in respect of the Company's share in derivative instruments of unconsolidated investment															0	0	0	(4,755)	(4,755)	0	(4,755)
Amortization of unrealized gains in respect of derivative instruments designated for cash flow hedge															0	0	0	(8)	(8)	0	(8)
Increase in noncontrolling interest															$ 0	0	0	0	0	1,447	1,447
Balance (in shares) at Mar. 31, 2020															51,036
Balance at Mar. 31, 2020															$ 51	915,139	507,537	(13,662)	1,409,065	124,586	1,533,651
Balance (in shares) at Dec. 31, 2019	51,032														51,032
Balance at Dec. 31, 2019	$ 0	$ 0	$ (755)	$ 0	$ (755)	$ 0	$ (755)	$ 51	$ 913,150	$ 487,118	$ (8,654)	$ 1,391,665	$ 122,990	$ 1,514,655	$ 51	913,150	487,873	(8,654)	1,392,420	122,990	1,515,410
Change in foreign currency translation adjustments																					276
Balance (in shares) at Jun. 30, 2020															51,067
Balance at Jun. 30, 2020															$ 51	917,403	524,864	(13,921)	1,428,397	128,414	1,556,811
Balance (in shares) at Mar. 31, 2020															51,036
Balance at Mar. 31, 2020															$ 51	915,139	507,537	(13,662)	1,409,065	124,586	1,533,651
Stock-based compensation															$ 0	2,264	0	0	2,264	0	2,264
Exercise of options by employees and directors (in shares)															31
Exercise of options by employees and directors															$ 0	0	0	0	0	0	0
Cash dividend declared															0	0	(5,719)	0	(5,719)	0	(5,719)
Net income															0	0	23,046	0	23,046	1,982	25,028
Change in foreign currency translation adjustments															0	0	0	382	382	539	921
Change in respect of derivative instruments designated for cash flow hedge															0	0	0	17	17	0	17
Change in unrealized gains or losses in respect of the Company's share in derivative instruments of unconsolidated investment															0	0	0	(653)	(653)	0	(653)
Amortization of unrealized gains in respect of derivative instruments designated for cash flow hedge															0	0	0	(5)	(5)	0	(5)
Increase in noncontrolling interest															$ 0	0	0	0	0	1,307	1,307
Balance (in shares) at Jun. 30, 2020															51,067
Balance at Jun. 30, 2020															$ 51	$ 917,403	$ 524,864	$ (13,921)	$ 1,428,397	$ 128,414	$ 1,556,811

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Equity (Unaudited) (Parentheticals) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019
Retained Earnings [Member]
Cash dividend declared, per share (in dollars per share)	$ 0.11	$ 0.11	$ 0.11	$ 0.11
Amortization of unrealized gains in respect of derivative instruments designated for cash flow hedge, tax				$ 6
Change in unrealized gains or losses in respect of the Company's share in derivative instruments of unconsolidated investment, tax	$ 0		$ 0	$ 0
Amortization of unrealized gains in respect of derivative instruments designated for cash flow hedge, tax	$ 6		$ 6

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Cash Flow (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities:
Net income	$ 55,176	$ 64,327
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	74,859	73,331
Accretion of asset retirement obligation	1,545	1,323
Stock-based compensation	4,253	5,003
Amortization of deferred lease income	0	(1,344)
Income attributable to sale of tax benefits, net of interest expense	(5,538)	(6,089)
Equity in losses (earnings) of investees	(923)	(2,249)
Mark-to-market of derivative instruments	(2,043)	(1,579)
Loss on disposal of property, plant and equipment	801	1,136
Loss (gain) on severance pay fund asset	38	(547)
Deferred income tax provision	19,731	1,534
Liability for unrecognized tax benefits	666	2,709
Deferred lease revenues	0	(364)
Changes in operating assets and liabilities, net of businesses acquired:
Receivables	(24,831)	2,200
Costs and estimated earnings in excess of billings on uncompleted contracts	18,888	14,778
Inventories	(3,983)	4,224
Prepaid expenses and other	1,719	6,894
Change in operating lease right of use asset	1,865	4,176
Deposits and other	1,048	(2,284)
Accounts payable and accrued expenses	10,009	(6,196)
Billings in excess of costs and estimated earnings on uncompleted contracts	2,844	(4,272)
Liabilities for severance pay	84	64
Change in operating lease liabilities	(1,634)	0
Other long-term liabilities	(220)	(696)
Net cash provided by operating activities	154,354	156,079
Cash flows from investing activities:
Capital expenditures	(151,254)	(114,880)
Investment in unconsolidated companies	(7,759)	0
Decrease (increase) in severance pay fund asset, net of payments made to retired employees	(14)	712
Net cash used in investing activities	(159,027)	(114,168)
Cash flows from financing activities:
Proceeds from long-term loans, net of transaction costs	129,407	132,847
Repayments of commercial paper and prepayment of loans	(46,225)	(6,098)
Proceeds from revolving credit lines with banks	1,250,639	1,298,500
Repayment of revolving credit lines with banks	(1,191,132)	(1,404,400)
Cash received from noncontrolling interest	7,577	3,346
Repayments of long-term debt	(31,784)	(36,767)
Cash paid to noncontrolling interest	(3,661)	(7,828)
Payments under finance lease obligations	(1,389)	(1,713)
Deferred debt issuance costs	(677)	(4,345)
Cash dividends paid	(11,333)	(11,168)
Net cash provided by (used in) financing activities	101,422	(37,626)
Effect of exchange rate changes	(25)	(141)
Net change in cash and cash equivalents and restricted cash and cash equivalents	96,724	4,144
Cash and cash equivalents and restricted cash and cash equivalents at beginning of period	153,110	177,495
Cash and cash equivalents and restricted cash and cash equivalents at end of period	249,834	181,639
Supplemental non-cash investing and financing activities:
Increase (decrease) in accounts payable related to purchases of property, plant and equipment	$ (2,226)	$ 6,010

Note 1 - General and Basis of P

Note 1 - General and Basis of Presentation	6 Months Ended
	Jun. 30, 2020
Notes to Financial Statements
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	NOTE 1 These unaudited condensed consolidated interim financial statements of Ormat Technologies, Inc. and its subsidiaries (collectively, the “Company”) have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) and pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”) for interim financial statements. Accordingly, they do not June 30, 2020, three six June 30, 2020 2019 six June 30, 2020 2019. The financial data and other information disclosed in the notes to the condensed consolidated financial statements related to these periods are unaudited. The results for the periods presented are not These condensed unaudited consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in the Company’s Annual Report on Form 10 December 31, 2019. December 31, 2019 December 31, 2019 not Dollar amounts, except per share data, in the notes to these financial statements are rounded to the closest $1,000. Senior Unsecured Bonds - Series 3 On April 6, 2020, 3 3 3 September 2022 3 On April 20, 2020, 3 3 3 September 2022 3 Additionally, on May 13, 2020, 3 3 3 September 2022 3 Senior Unsecured Loan In April 2020, second March 22, 2018. September 15, 2021 September 15, 2028. one March 15, 2029. COVID- 19 In March 2020, 19" 19 first 2020, second July 2020, 11, 19 may no 19 no Puna On May 3, 2018, 38 three first six 2020, second May 2018 first six 2020, second six June 30, 2020. not As of August 2020, one fourth 29 In December 2019, 2052 46MW no 8MW 2022. The Company continues to assess the accounting implications of this event on the assets and liabilities on its consolidated balance sheets 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. Write-offs of unsuccessful exploration activities There were no write-offs of unsuccessful exploration activities for the three six June 30, 2020 2019. 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 as reported on the balance sheet to the total of the same amounts shown on the statement of cash flows: June 30, December 31, June 30, 2020 2019 2019 (Dollars in thousands) Cash and cash equivalents $ 173,718 $ 71,173 $ 110,665 Restricted cash and cash equivalents 76,116 81,937 70,974 Total Cash and cash equivalents and restricted cash and cash equivalents $ 249,834 $ 153,110 $ 181,639 Concentration of credit risk Financial instruments that potentially subject the Company to a 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 United States (“U.S.”) and in foreign countries. At June 30, 2020 December 31, 2019, ten $250,000 June 30, 2020 December 31, 2019, At June 30, 2020 December 31, 2019, June 30, 2020 December 31, 2019, 10% six June 30, 2020 2019, Sierra Pacific Power Company and Nevada Power Company (subsidiaries of NV Energy, Inc.) accounted for 17.2% and 16.5% of the Company's total revenues for the three June 30, 2020 2019, six June 30, 2020 2019, Southern California Public Power Authority (“SCPPA”) accounted for 20.0% and 17.2% of the Company's total revenues for the three June 30, 2020 2019, six June 30, 2020 2019, Kenya Power and Lighting Co. Ltd. ("KPLC") accounted for 16.0% and 16.6% of the Company's total revenues for the three June 30, 2020 2019, six June 30, 2020 2019, The Company has historically been able to collect on substantially all of its receivable balances. As of June 30, 2020, July 2020. April 17, 2020, 19 150 133.9 In Honduras, the Company has been able to collect current charges from Empresa Nacional de Energía Eléctrica (“ENEE”) starting in May 2019. 19 may June 30, 2020, October 2018 April 2019 February March July 2020, April 30, 2020, 19. not The Company may 19 Revenues from Contracts with Customers Contract assets related to our Product segment reflect revenue 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 June 30, 2020 December 31, 2019 June 30, December 31, 2020 2019 (Dollars in thousands) Contract assets (*) $ 19,477 $ 38,365 Contract liabilities (*) $ (5,599 ) $ (2,755 ) (*) 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 six June 30, 2020 On June 30, 2020, not Leases in which the Company is a lessor The table below presents the lease income recognized as a lessor: Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 (Dollars in thousands) (Dollars in thousands) Lease income relating to lease payments from operating leases $ 113,083 $ 116,138 $ 239,159 $ 242,046

Note 2 - New Accounting Pronoun

Note 2 - New Accounting Pronouncements	6 Months Ended
	Jun. 30, 2020
Notes to Financial Statements
Accounting Standards Update and Change in Accounting Principle [Text Block]	NOTE 2 New accounting pronouncements effective in the six June 30, 2020 Financial Instruments—Credit Losses In June 2016, 2016 13, 326 November 2018, 2018 19, 326, 2018 19 not January 1, 2020, not may January 1, 2020 19 19 not The following table describes the changes in the allowance for expected credit losses for the three six June 30, 2020 ( Three Months Ended June 30, Six Months Ended June 30, 2020 2020 (Dollars in thousands) Beginning balance of the allowance for expected credit losses $ 779 $ 755 Current period provision for expected credit losses — 24 Ending balance of the allowance for expected credit losses $ 779 $ 779 New accounting pronouncements effective in future periods Accounting for Income Taxes In December 2019, 2019 12, 740 2019 12 740. December 15, 2020 not 2019 12 June 30, 2020. not 2019 12 Reference Rate Reform In March 2020, 2020 04, 848 December 31, 2021. 470, March 12, 2020 December 31, 2022. may March 12, 2020, March 12, 2020, not

Note 3 - Inventories

Note 3 - Inventories	6 Months Ended
	Jun. 30, 2020
Notes to Financial Statements
Inventory Disclosure [Text Block]	NOTE 3 Inventories consist of the following: June 30, December 31, 2020 2019 (Dollars in thousands) Raw materials and purchased parts for assembly $ 22,593 $ 21,942 Self-manufactured assembly parts and finished products 16,339 13,007 Total inventories $ 38,932 $ 34,949

Note 4 - Fair Value of Financia

Note 4 - Fair Value of Financial Instruments	6 Months Ended
	Jun. 30, 2020
Notes to Financial Statements
Fair Value Disclosures [Text Block]	NOTE 4— 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 June 30, 2020 December 31, 2019 June 30, 2020 Fair Value Carrying Value at June 30, 2020 Total Level 1 Level 2 Level 3 (Dollars in thousands) Assets: Current assets: Cash equivalents (including restricted cash accounts) $ 36,661 $ 36,661 $ 36,661 $ — $ — Derivatives: Contingent receivable (1) 101 101 — — 101 Currency forward contracts (2) 2,405 2,405 — 2,405 — Liabilities: Current liabilities: Derivatives: Contingent payables (1) (2,900 ) (2,900 ) — — (2,900 ) $ 36,267 $ 36,267 $ 36,661 $ 2,405 $ (2,799 ) 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 receivables (1) 102 102 — — 102 Currency forward contracts (2) 362 362 — 362 — Liabilities: Current liabilities: Derivatives: Contingent payable (1) (3,359 ) (3,359 ) — — (3,359 ) $ 25,421 $ 25,421 $ 28,316 $ 362 $ (3,257 ) 1. These amounts relate to contingent receivables and payables relating to acquisition of the Guadeloupe power plant, 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 June 30, 2020 December 31, 2019 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 “Prepaid expenses and other” and “Accounts payable and accrued expenses”, as applicable, on June 30, 2020 December 31, 2019, 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 on derivative instruments not Amount of recognized gain (loss) Amount of recognized gain (loss) Derivatives not designated as hedging instruments Location of recognized gain (loss) Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Currency forward contracts Derivative and foreign currency transaction gains (losses) 1,435 616 $ 2,525 $ 1,699 $ 1,435 $ 616 $ 2,525 $ 1,699 The foregoing forward transactions were not There were no 1, 2 3 six June 30, 2020. The fair value of the Company’s long-term debt approximates its carrying amount, except for the following: Fair Value Carrying Amount June 30, 2020 December 31, 2019 June 30, 2020 December 31, 2019 (Dollars in millions) (Dollars in millions) Olkaria III Loan - OPIC $ 203.4 $ 202.1 $ 183.6 $ 192.6 Olkaria III plant 4 Loan - DEG 2 43.2 43.8 40.0 42.5 Olkaria III plant 1 Loan - DEG 3 38.3 38.8 34.9 37.1 Platanares Loan - OPIC 117.7 115.3 100.4 104.5 Amatitlan Loan 24.6 26.4 24.5 26.3 Senior Secured Notes: OFC 2 LLC ("OFC 2") 222.6 210.9 198.4 203.0 Don A. Campbell 1 ("DAC 1") 81.2 78.5 75.2 78.2 USG Prudential - NV 33.0 30.6 28.2 28.4 USG Prudential - ID 18.6 18.6 18.8 19.6 USG DOE 47.1 45.0 39.5 40.8 Senior Unsecured Bonds 294.8 205.7 285.2 204.3 Senior Unsecured Loan 231.5 161.3 200.0 150.0 Plumstriker 20.0 21.7 20.0 21.6 Other long-term debt 16.4 16.3 16.7 17.4 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. As disclosed above under Note 1 19 may may 19 may The carrying value of financial instruments such as revolving lines of credit and deposits approximates fair value. The following table presents the fair value of financial instruments as of June 30, 2020: Level 1 Level 2 Level 3 Total (Dollars in millions) Olkaria III - OPIC — — 203.4 203.4 Olkaria III plant 4 Loan - DEG 2 — — 43.2 43.2 Olkaria III plant 1 Loan - DEG 3 — — 38.3 38.3 Platanares Loan - OPIC — — 117.7 117.7 Amatitlan Loan — 24.6 — 24.6 Senior Secured Notes: OFC 2 Senior Secured Notes — — 222.6 222.6 DAC 1 Senior Secured Notes — — 81.2 81.2 USG Prudential - NV — — 33.0 33.0 USG Prudential - ID — — 18.6 18.6 USG DOE — — 47.1 47.1 Senior Unsecured Bonds — — 294.8 294.8 Senior Unsecured Loan — — 231.5 231.5 Plumstriker — 20.0 — 20.0 Other long-term debt — — 16.4 16.4 Commercial paper — 3.8 — 3.8 Revolving lines of credit — 100.1 — 100.1 Deposits 12.2 — — 12.2 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 Loan - OPIC — — 202.1 202.1 Olkaria IV - DEG 2 — — 43.8 43.8 Olkaria IV - 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

Note 5 - Stock-based Compensati

Note 5 - Stock-based Compensation	6 Months Ended
	Jun. 30, 2020
Notes to Financial Statements
Share-based Payment Arrangement [Text Block]	NOTE 5 On May 12, 2020, 2018 six The fair value of each SAR, RSU and PSU on the grant date was $17.6, $67.2 and $73.2, respectively. The Company calculated the fair value of each SAR on the grant date using the complex lattice, tree-based option-pricing model based on the following assumptions: Risk-free interest rates 0.44 % Expected life (in years) 2.8 Dividend yield 0.63 % Expected volatility (weighted average) 28.14 % On June 15, 2020, 2018 six The fair value of each SAR, RSU and PSU on the grant date was $18.0, $68.0 and $65.0 , respectively. The Company calculated the fair value of each SAR on the grant date using the complex lattice, tree-based option-pricing model based on the following assumptions: Risk-free interest rates 0.44% - 0.28% Expected life (in years) 2 - 2.8 Dividend yield 0.64% Expected volatility (weighted average) 28.5% - 35.2%

Note 6 - Interest Expense, Net

Note 6 - Interest Expense, Net	6 Months Ended
	Jun. 30, 2020
Notes to Financial Statements
Interest Expense Disclosure [Text Block]	NOTE 6 The components of interest expense are as follows: Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 (Dollars in thousands) (Dollars in thousands) Interest related to sale of tax benefits $ 2,500 $ 3,155 $ 4,824 $ 6,816 Interest expense 19,634 18,821 36,800 36,383 Less — amount capitalized (2,349 ) (459 ) (4,566 ) (459 ) Total interest expense, net $ 19,785 $ 21,517 $ 37,058 $ 42,740

Note 7 - Earnings Per Share

Note 7 - Earnings Per Share	6 Months Ended
	Jun. 30, 2020
Notes to Financial Statements
Earnings Per Share [Text Block]	NOTE 7 Basic earnings per share attributable to the Company’s stockholders 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 (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Weighted average number of shares used in computation of basic earnings per share add: 51,043 50,800 51,040 50,757 Additional shares from the assumed exercise of employee stock options 319 294 408 301 Weighted average number of shares used in computation of diluted earnings per share 51,362 51,094 51,448 51,058 The number of stock-based awards that could potentially dilute future earnings per share and that were not three June 30, 2020 2019, six June 30, 2020 2019,

Note 8 - Business Segments

Note 8 - Business Segments	6 Months Ended
	Jun. 30, 2020
Notes to Financial Statements
Segment Reporting Disclosure [Text Block]	NOTE 8 The Company has three • Under the Electricity segment the Company builds, owns and operates geothermal, solar PV and recovered energy-based power plants in the United States and geothermal power plants in other countries around the world and sell the electricity they generate. • Under the Product segment, the Company designs, manufactures and sells equipment for geothermal and recovered energy-based electricity generation and remote power units and provide services relating to the engineering, procurement and construction of geothermal and recovered energy-based power plants. • Under the ESMS segment the Company provides 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 mainly through its Viridity business. Transfer prices between the operating segments are determined based 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 the Company's disaggregated revenues from contracts with customers: Electricity Product ESMS Consolidated (Dollars in thousands) Three Months Ended June 30, 2020: Revenues from external customers: United States (1) $ 80,427 $ 2,269 $ 2,514 $ 85,210 Foreign (2) 48,258 41,432 — 89,690 Net revenue from external customers 128,685 43,701 2,514 174,900 Intersegment revenue — 50,453 — 50,453 Operating income (loss) 45,875 3,803 (1,603 ) 48,075 Segment assets at period end (3) (*) 3,150,770 190,474 77,133 3,418,377 * Including unconsolidated investments 84,414 — — 84,414 Three Months Ended June 30, 2019: Revenues from external customers: United States (1) $ 76,931 $ 12,532 $ 2,956 $ 92,419 Foreign (2) 52,148 39,498 — 91,646 Net revenue from external customers 129,079 52,030 2,956 184,065 Intersegment revenue — 19,167 — 19,167 Operating income (loss) 43,475 5,307 (1,902 ) 46,880 Segment assets at period end (3) (*) 2,992,891 128,524 72,366 3,193,781 * Including unconsolidated investments 71,047 — — 71,047 Six Months Ended June 30, 2020: Revenues from external customers: United States (1) $ 172,119 $ 2,667 $ 4,360 $ 179,146 Foreign (2) 99,422 88,445 — 187,867 Net revenue from external customers 271,541 91,112 4,360 367,013 Intersegment revenue — 59,109 — 59,109 Operating income (loss) 104,505 7,675 (3,048 ) 109,132 Segment assets at period end (3) (*) 3,150,770 190,474 77,133 3,418,377 * Including unconsolidated investments 84,414 — — 84,414 Six Months Ended June 30, 2019: Revenues from external customers: United States (1) $ 168,459 $ 23,775 $ 6,958 $ 199,192 Foreign (2) 103,528 80,383 — 183,911 Net revenue from external customers 271,987 104,158 6,958 383,103 Intersegment revenue — 37,428 — 37,428 Operating income (loss) 95,026 9,559 (3,980 ) 100,605 Segment assets at period end (3) (*) 2,992,891 128,524 72,366 3,193,781 * Including unconsolidated investments 71,047 — — 71,047 ( 1 Electricity segment revenues in the United States are all accounted under lease accounting except for $15.6 million and $32.4 million in the three six June 30, 2020, 606. three six June 30, 2019, 606. 606. ( 2 Electricity segment revenues in foreign countries are all accounted under lease accounting. Product segment revenues in foreign countries are accounted under ASC 606. ( 3 Electricity segment assets include goodwill in the amount of $20.1 million and $20.2 million as of June 30, 2020 2019, No June 30, 2020 2019. Reconciling information between reportable segments and the Company’s consolidated totals is shown in the following table: Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 (Dollars in thousands) (Dollars in thousands) Revenues: Total segment revenues $ 174,900 $ 184,065 $ 367,013 $ 383,103 Intersegment revenues 50,453 19,167 59,109 37,428 Elimination of intersegment revenues (50,453 ) (19,167 ) (59,109 ) (37,428 ) Total consolidated revenues $ 174,900 $ 184,065 $ 367,013 $ 383,103 Operating income: Operating income $ 48,075 $ 46,880 $ 109,132 $ 100,605 Interest income 441 420 843 713 Interest expense, net (19,785 ) (21,517 ) (37,058 ) (42,740 ) Derivatives and foreign currency transaction gains (losses) 671 19 1,064 491 Income attributable to sale of tax benefits 5,672 4,637 9,804 12,401 Other non-operating income (expense), net 304 1,027 382 1,118 Total consolidated income before income taxes and equity in income of investees $ 35,378 $ 31,466 $ 84,167 $ 72,588

Note 9 - Commitments and Contin

Note 9 - Commitments and Contingencies	6 Months Ended
	Jun. 30, 2020
Notes to Financial Statements
Commitments and Contingencies Disclosure [Text Block]	NOTE 9 • On May 21, 2018, 11 August 3, 2017 May 13, 2018". 31 1 38C 10 10b 5 1 2017 2 May 16, 2018, May 11, 2018 2017 June 30, 2020, July 2, 2020, not may • 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 March 23, 2020, June 10, 2020 , not • On September 11, 2018, October 22, 2018, four 14 2018 January 24, 2019, July 10, 2020, not • Following the announcement of the Company’s acquisition of U.S. Geothermal Inc. ("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 March 27, 2020, June 3, 2020, September 16, 2020. not • On March 29, 2016, 27th 11th April 16, 2020, 11th not May 2020, may 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 10 - Income Taxes

Note 10 - Income Taxes	6 Months Ended
	Jun. 30, 2020
Notes to Financial Statements
Income Tax Disclosure [Text Block]	NOTE 10 The Company’s effective tax rate expense (benefit) for the three June 30, 2020 2019 six June 30, 2020 2019, six June 30, 2020 In response to the COVID- 19 March 27, 2020 six June 30, 2020, no 19 Tax Audit in Kenya The Company has received three 2013 2017. first two third The Company is currently at different stages of discussions with the KRA on the matters included in the KRA assessments. The Company believes its tax positions for the issues raised during the audit period is more-likely-than- not June 30, 2020, not

Note 11 - Subsequent Events

Note 11 - Subsequent Events	6 Months Ended
	Jun. 30, 2020
Notes to Financial Statements
Subsequent Events [Text Block]	NOTE 11 Senior Unsecured Bonds - Series 4 On July 1, 2020, 4” 4 4 December 2020 June 2022 4. 4 Cross Currency Swap Shortly after the issuance of the Senior Unsecured Bonds - Series 4, 4 4, 815, Cash Dividend On August 4, 2020, August 18, 2020 September 1, 2020 Energy storage assets portfolio purchase transaction On July 20, 2020, 20MW/80MWh December 2016 The Pomona facility is one first 73MW/136MWh The Company will account for the transaction under ASC 805,

Significant Accounting Policies

Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2020
Accounting Policies [Abstract]
Effect of COVID-19 Pandemic, Policy [Text Block]	COVID- 19 In March 2020, 19" 19 first 2020, second July 2020, 11, 19 may no 19 no
Puna Power Plant, Policy [Policy Text Block]	Puna On May 3, 2018, 38 three first six 2020, second May 2018 first six 2020, second six June 30, 2020. not As of August 2020, one fourth 29 In December 2019, 2052 46MW no 8MW 2022. The Company continues to assess the accounting implications of this event on the assets and liabilities on its consolidated balance sheets 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.
Exploratory Drilling Costs Capitalization and Impairment, Policy [Policy Text Block]	Write-offs of unsuccessful exploration activities There were no write-offs of unsuccessful exploration activities for the three six June 30, 2020 2019.
Cash and Cash Equivalents, Policy [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 as reported on the balance sheet to the total of the same amounts shown on the statement of cash flows: June 30, December 31, June 30, 2020 2019 2019 (Dollars in thousands) Cash and cash equivalents $ 173,718 $ 71,173 $ 110,665 Restricted cash and cash equivalents 76,116 81,937 70,974 Total Cash and cash equivalents and restricted cash and cash equivalents $ 249,834 $ 153,110 $ 181,639
Concentration Risk, Credit Risk, Policy [Policy Text Block]	Concentration of credit risk Financial instruments that potentially subject the Company to a 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 United States (“U.S.”) and in foreign countries. At June 30, 2020 December 31, 2019, ten $250,000 June 30, 2020 December 31, 2019, At June 30, 2020 December 31, 2019, June 30, 2020 December 31, 2019, 10% six June 30, 2020 2019, Sierra Pacific Power Company and Nevada Power Company (subsidiaries of NV Energy, Inc.) accounted for 17.2% and 16.5% of the Company's total revenues for the three June 30, 2020 2019, six June 30, 2020 2019, Southern California Public Power Authority (“SCPPA”) accounted for 20.0% and 17.2% of the Company's total revenues for the three June 30, 2020 2019, six June 30, 2020 2019, Kenya Power and Lighting Co. Ltd. ("KPLC") accounted for 16.0% and 16.6% of the Company's total revenues for the three June 30, 2020 2019, six June 30, 2020 2019, The Company has historically been able to collect on substantially all of its receivable balances. As of June 30, 2020, July 2020. April 17, 2020, 19 150 133.9 In Honduras, the Company has been able to collect current charges from Empresa Nacional de Energía Eléctrica (“ENEE”) starting in May 2019. 19 may June 30, 2020, October 2018 April 2019 February March July 2020, April 30, 2020, 19. not The Company may 19
Revenue [Policy Text Block]	Revenues from Contracts with Customers Contract assets related to our Product segment reflect revenue 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 June 30, 2020 December 31, 2019 June 30, December 31, 2020 2019 (Dollars in thousands) Contract assets (*) $ 19,477 $ 38,365 Contract liabilities (*) $ (5,599 ) $ (2,755 ) (*) 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 six June 30, 2020 On June 30, 2020, not
Lessor, Leases [Policy Text Block]	Leases in which the Company is a lessor The table below presents the lease income recognized as a lessor: Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 (Dollars in thousands) (Dollars in thousands) Lease income relating to lease payments from operating leases $ 113,083 $ 116,138 $ 239,159 $ 242,046

Note 1 - General and Basis of_2

Note 1 - General and Basis of Presentation (Tables)	6 Months Ended
	Jun. 30, 2020
Notes Tables
Schedule of Cash and Cash Equivalents [Table Text Block]	June 30, December 31, June 30, 2020 2019 2019 (Dollars in thousands) Cash and cash equivalents $ 173,718 $ 71,173 $ 110,665 Restricted cash and cash equivalents 76,116 81,937 70,974 Total Cash and cash equivalents and restricted cash and cash equivalents $ 249,834 $ 153,110 $ 181,639
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block]	June 30, December 31, 2020 2019 (Dollars in thousands) Contract assets (*) $ 19,477 $ 38,365 Contract liabilities (*) $ (5,599 ) $ (2,755 )
Operating Lease, Lease Income [Table Text Block]	Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 (Dollars in thousands) (Dollars in thousands) Lease income relating to lease payments from operating leases $ 113,083 $ 116,138 $ 239,159 $ 242,046

Note 2 - New Accounting Prono_2

Note 2 - New Accounting Pronouncements (Tables)	6 Months Ended
	Jun. 30, 2020
Notes Tables
Accounts Receivable, Allowance for Credit Loss [Table Text Block]	Three Months Ended June 30, Six Months Ended June 30, 2020 2020 (Dollars in thousands) Beginning balance of the allowance for expected credit losses $ 779 $ 755 Current period provision for expected credit losses — 24 Ending balance of the allowance for expected credit losses $ 779 $ 779

Note 3 - Inventories (Tables)

Note 3 - Inventories (Tables)	6 Months Ended
	Jun. 30, 2020
Notes Tables
Schedule of Inventory, Current [Table Text Block]	June 30, December 31, 2020 2019 (Dollars in thousands) Raw materials and purchased parts for assembly $ 22,593 $ 21,942 Self-manufactured assembly parts and finished products 16,339 13,007 Total inventories $ 38,932 $ 34,949

Note 4 - Fair Value of Financ_2

Note 4 - Fair Value of Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2020
Notes Tables
Fair Value, by Balance Sheet Grouping [Table Text Block]	June 30, 2020 Fair Value Carrying Value at June 30, 2020 Total Level 1 Level 2 Level 3 (Dollars in thousands) Assets: Current assets: Cash equivalents (including restricted cash accounts) $ 36,661 $ 36,661 $ 36,661 $ — $ — Derivatives: Contingent receivable (1) 101 101 — — 101 Currency forward contracts (2) 2,405 2,405 — 2,405 — Liabilities: Current liabilities: Derivatives: Contingent payables (1) (2,900 ) (2,900 ) — — (2,900 ) $ 36,267 $ 36,267 $ 36,661 $ 2,405 $ (2,799 ) 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 receivables (1) 102 102 — — 102 Currency forward contracts (2) 362 362 — 362 — Liabilities: Current liabilities: Derivatives: Contingent payable (1) (3,359 ) (3,359 ) — — (3,359 ) $ 25,421 $ 25,421 $ 28,316 $ 362 $ (3,257 )
Derivative Instruments, Gain (Loss) [Table Text Block]	Amount of recognized gain (loss) Amount of recognized gain (loss) Derivatives not designated as hedging instruments Location of recognized gain (loss) Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Currency forward contracts Derivative and foreign currency transaction gains (losses) 1,435 616 $ 2,525 $ 1,699 $ 1,435 $ 616 $ 2,525 $ 1,699
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]	Fair Value Carrying Amount June 30, 2020 December 31, 2019 June 30, 2020 December 31, 2019 (Dollars in millions) (Dollars in millions) Olkaria III Loan - OPIC $ 203.4 $ 202.1 $ 183.6 $ 192.6 Olkaria III plant 4 Loan - DEG 2 43.2 43.8 40.0 42.5 Olkaria III plant 1 Loan - DEG 3 38.3 38.8 34.9 37.1 Platanares Loan - OPIC 117.7 115.3 100.4 104.5 Amatitlan Loan 24.6 26.4 24.5 26.3 Senior Secured Notes: OFC 2 LLC ("OFC 2") 222.6 210.9 198.4 203.0 Don A. Campbell 1 ("DAC 1") 81.2 78.5 75.2 78.2 USG Prudential - NV 33.0 30.6 28.2 28.4 USG Prudential - ID 18.6 18.6 18.8 19.6 USG DOE 47.1 45.0 39.5 40.8 Senior Unsecured Bonds 294.8 205.7 285.2 204.3 Senior Unsecured Loan 231.5 161.3 200.0 150.0 Plumstriker 20.0 21.7 20.0 21.6 Other long-term debt 16.4 16.3 16.7 17.4
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 — — 203.4 203.4 Olkaria III plant 4 Loan - DEG 2 — — 43.2 43.2 Olkaria III plant 1 Loan - DEG 3 — — 38.3 38.3 Platanares Loan - OPIC — — 117.7 117.7 Amatitlan Loan — 24.6 — 24.6 Senior Secured Notes: OFC 2 Senior Secured Notes — — 222.6 222.6 DAC 1 Senior Secured Notes — — 81.2 81.2 USG Prudential - NV — — 33.0 33.0 USG Prudential - ID — — 18.6 18.6 USG DOE — — 47.1 47.1 Senior Unsecured Bonds — — 294.8 294.8 Senior Unsecured Loan — — 231.5 231.5 Plumstriker — 20.0 — 20.0 Other long-term debt — — 16.4 16.4 Commercial paper — 3.8 — 3.8 Revolving lines of credit — 100.1 — 100.1 Deposits 12.2 — — 12.2 Level 1 Level 2 Level 3 Total (Dollars in millions) Olkaria III Loan - OPIC — — 202.1 202.1 Olkaria IV - DEG 2 — — 43.8 43.8 Olkaria IV - 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

Note 5 - Stock-based Compensa_2

Note 5 - Stock-based Compensation (Tables)	6 Months Ended
	Jun. 30, 2020
Notes Tables
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]	Risk-free interest rates 0.44 % Expected life (in years) 2.8 Dividend yield 0.63 % Expected volatility (weighted average) 28.14 % Risk-free interest rates 0.44% - 0.28% Expected life (in years) 2 - 2.8 Dividend yield 0.64% Expected volatility (weighted average) 28.5% - 35.2%

Note 6 - Interest Expense, Net

Note 6 - Interest Expense, Net (Tables)	6 Months Ended
	Jun. 30, 2020
Notes Tables
Schedule of Other Nonoperating Expense, by Component [Table Text Block]	Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 (Dollars in thousands) (Dollars in thousands) Interest related to sale of tax benefits $ 2,500 $ 3,155 $ 4,824 $ 6,816 Interest expense 19,634 18,821 36,800 36,383 Less — amount capitalized (2,349 ) (459 ) (4,566 ) (459 ) Total interest expense, net $ 19,785 $ 21,517 $ 37,058 $ 42,740

Note 7 - Earnings Per Share (Ta

Note 7 - Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2020
Notes Tables
Schedule of Weighted Average Number of Shares [Table Text Block]	Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 Weighted average number of shares used in computation of basic earnings per share add: 51,043 50,800 51,040 50,757 Additional shares from the assumed exercise of employee stock options 319 294 408 301 Weighted average number of shares used in computation of diluted earnings per share 51,362 51,094 51,448 51,058

Note 8 - Business Segments (Tab

Note 8 - Business Segments (Tables)	6 Months Ended
	Jun. 30, 2020
Notes Tables
Schedule of Segment Reporting Information, by Segment [Table Text Block]	Electricity Product ESMS Consolidated (Dollars in thousands) Three Months Ended June 30, 2020: Revenues from external customers: United States (1) $ 80,427 $ 2,269 $ 2,514 $ 85,210 Foreign (2) 48,258 41,432 — 89,690 Net revenue from external customers 128,685 43,701 2,514 174,900 Intersegment revenue — 50,453 — 50,453 Operating income (loss) 45,875 3,803 (1,603 ) 48,075 Segment assets at period end (3) (*) 3,150,770 190,474 77,133 3,418,377 * Including unconsolidated investments 84,414 — — 84,414 Three Months Ended June 30, 2019: Revenues from external customers: United States (1) $ 76,931 $ 12,532 $ 2,956 $ 92,419 Foreign (2) 52,148 39,498 — 91,646 Net revenue from external customers 129,079 52,030 2,956 184,065 Intersegment revenue — 19,167 — 19,167 Operating income (loss) 43,475 5,307 (1,902 ) 46,880 Segment assets at period end (3) (*) 2,992,891 128,524 72,366 3,193,781 * Including unconsolidated investments 71,047 — — 71,047 Six Months Ended June 30, 2020: Revenues from external customers: United States (1) $ 172,119 $ 2,667 $ 4,360 $ 179,146 Foreign (2) 99,422 88,445 — 187,867 Net revenue from external customers 271,541 91,112 4,360 367,013 Intersegment revenue — 59,109 — 59,109 Operating income (loss) 104,505 7,675 (3,048 ) 109,132 Segment assets at period end (3) (*) 3,150,770 190,474 77,133 3,418,377 * Including unconsolidated investments 84,414 — — 84,414 Six Months Ended June 30, 2019: Revenues from external customers: United States (1) $ 168,459 $ 23,775 $ 6,958 $ 199,192 Foreign (2) 103,528 80,383 — 183,911 Net revenue from external customers 271,987 104,158 6,958 383,103 Intersegment revenue — 37,428 — 37,428 Operating income (loss) 95,026 9,559 (3,980 ) 100,605 Segment assets at period end (3) (*) 2,992,891 128,524 72,366 3,193,781 * Including unconsolidated investments 71,047 — — 71,047
Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block]	Three Months Ended June 30, Six Months Ended June 30, 2020 2019 2020 2019 (Dollars in thousands) (Dollars in thousands) Revenues: Total segment revenues $ 174,900 $ 184,065 $ 367,013 $ 383,103 Intersegment revenues 50,453 19,167 59,109 37,428 Elimination of intersegment revenues (50,453 ) (19,167 ) (59,109 ) (37,428 ) Total consolidated revenues $ 174,900 $ 184,065 $ 367,013 $ 383,103 Operating income: Operating income $ 48,075 $ 46,880 $ 109,132 $ 100,605 Interest income 441 420 843 713 Interest expense, net (19,785 ) (21,517 ) (37,058 ) (42,740 ) Derivatives and foreign currency transaction gains (losses) 671 19 1,064 491 Income attributable to sale of tax benefits 5,672 4,637 9,804 12,401 Other non-operating income (expense), net 304 1,027 382 1,118 Total consolidated income before income taxes and equity in income of investees $ 35,378 $ 31,466 $ 84,167 $ 72,588

Note 1 - General and Basis of_3

Note 1 - General and Basis of Presentation 1 (Details Textual) $ in Thousands	May 13, 2020USD ($)	Apr. 20, 2020USD ($)	Apr. 06, 2020USD ($)	Jul. 31, 2020USD ($)	Jun. 30, 2020USD ($)	Jun. 30, 2019USD ($)	Jul. 31, 2020USD ($)	Jun. 30, 2020USD ($)	Jun. 30, 2019USD ($)	Dec. 31, 2019USD ($)	Apr. 30, 2020USD ($)
Exploration Abandonment and Impairment Expense					$ 0	$ 0		$ 0	$ 0
Cash, FDIC Insured Amount					11,400			11,400		$ 12,900
Cash, Uninsured Amount					116,100			116,100		84,800
Accounts Receivable, after Allowance for Credit Loss, Current, Total					179,757			179,757		$ 154,525
Product [Member]
Revenue, Remaining Performance Obligation, Amount					$ 63,500			$ 63,500
Revenue, Remaining Performance Obligation, Percentage					100.00%			100.00%
Kenya Power and Lighting Co LTD [Member]
Accounts Receivable, Past Due					$ 54,800			$ 54,800
Accounts Receivable, Past Due, Average Number of Days Overdue					81			81
Kenya Power and Lighting Co LTD [Member] | Subsequent Event [Member]
Proceeds, Overdue Accounts Receivable				$ 8,800
ENNE [Member]
Accounts Receivable, Past Due					$ 24,000			$ 24,000
ENNE [Member] | February and March [Member]
Accounts Receivable, Past Due					20,100			20,100
ENNE [Member] | October 2018 and April 2019 [Member]
Accounts Receivable, Past Due					$ 4,000			$ 4,000
ENNE [Member] | Subsequent Event [Member]
Proceeds, Overdue Accounts Receivable				$ 700
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Primary Customers [Member]
Concentration Risk, Percentage								52.00%		58.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Sierra Pacific Power Company And Nevada Power Company [Member]
Concentration Risk, Percentage					17.20%	16.50%		18.30%	17.40%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Southern California Public Power Authority [Member]
Concentration Risk, Percentage					20.00%	17.20%		19.50%	18.30%
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Kenya Power and Lighting Co LTD [Member]
Concentration Risk, Percentage					16.00%	16.60%		15.70%	16.00%
Non-US [Member]
Accounts Receivable, after Allowance for Credit Loss, Current, Total					$ 151,600			$ 151,600		$ 118,800
Electricity Segment [Member] | Puna Geothermal Power Plant [Member]
Proceeds from Insurance Settlement, Operating Activities					800			3,900
Electricity Segment [Member] | Puna Geothermal Power Plant [Member] | Cost of Sales [Member]
Proceeds from Insurance Settlement, Operating Activities					$ 3,300			8,200
Electricity Segment [Member] | Puna Geothermal Power Plant [Member] | General and Administrative Expense [Member]
Proceeds from Insurance Settlement, Operating Activities								$ 3,000
COVID 19 [Member]
Proceeds from Issuance of Long-term Debt, Total							$ 400,000
Senior Unsecured Bonds, Series 3 [Member]
Proceeds from Issuance of Long-term Debt, Total	$ 15,300	$ 14,500	$ 50,000
Debt Instrument, Interest Rate, Stated Percentage	4.45%	4.45%	4.45%
Second Addendum Migdal Loan [Member]
Debt Instrument, Interest Rate, Stated Percentage											5.44%
Debt Instrument, Face Amount											$ 50,000
Debt Instrument, Principal to Be Repaid in Installments											$ 31,500
Debt Instrument, Number of Semi-annual Payments											15
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid											$ 18,500

Note 1 - General and Basis of_4

Note 1 - General and Basis of Presentation 2 (Details Textual)	Jun. 30, 2020
Product [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Month)	24 months

Note 1 - General and Basis of_5

Note 1 - General and Basis of Presentation - Cash and Restricted Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Cash and cash equivalents	$ 173,718	$ 71,173	$ 110,665
Restricted cash and cash equivalents	76,116	81,937	70,974
Total Cash and cash equivalents and restricted cash and cash equivalents	$ 249,834	$ 153,110	$ 181,639	$ 177,495

Note 1 - General and Basis of_6

Note 1 - General and Basis of Presentation - Contract Assets (Liabilities) (Details) - USD ($) $ in Thousands		Jun. 30, 2020	Dec. 31, 2019
Contract assets (*)	[1]	$ 19,477	$ 38,365
Contract liabilities (*)	[1]	$ (5,599)	$ (2,755)
[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 six months ended June 30, 2020 as a result of performance obligations satisfied.

Note 1 - General and Basis of_7

Note 1 - General and Basis of Presentation - Lease Income as Lessor (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Lease income relating to lease payments from operating leases	$ 113,083	$ 116,138	$ 239,159	$ 242,046

Note 2 - New Accounting Prono_3

Note 2 - New Accounting Pronouncements (Details Textual) - USD ($) $ in Thousands	Jun. 30, 2020	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance	$ 1,556,811	$ 1,533,651		$ 1,515,410	$ 1,491,641	$ 1,462,995	$ 1,445,096
Cumulative Effect, Period of Adoption, Adjustment [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance				(755)			(58)
Retained Earnings [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance	$ 524,864	$ 507,537		487,873	$ 470,880	$ 442,531	422,222
Retained Earnings [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance				$ (755)			$ (58)
Accounting Standards Update 2016-13 [Member] | Retained Earnings [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance			$ (800)

Note 2 - New Accounting Prono_4

Note 2 - New Accounting Pronouncements - Changes in the Allowance for Expected Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020
Beginning balance of the allowance for expected credit losses		$ 0
Ending balance of the allowance for expected credit losses	$ 779	779
Accounting Standards Update 2016-13 [Member]
Beginning balance of the allowance for expected credit losses	779	755
Current period provision for expected credit losses	0	24
Ending balance of the allowance for expected credit losses	$ 779	$ 779

Note 3 - Inventories - Inventor

Note 3 - Inventories - Inventories, Current (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Raw materials and purchased parts for assembly	$ 22,593	$ 21,942
Self-manufactured assembly parts and finished products	16,339	13,007
Total inventories	$ 38,932	$ 34,949

Note 4 - Fair Value of Financ_3

Note 4 - Fair Value of Financial Instruments - Financial Assets and Liabilities at Fair Value (Details) - USD ($) $ in Thousands		Jun. 30, 2020	Dec. 31, 2019
Reported Value Measurement [Member]
Cash equivalents (including restricted cash accounts)		$ 36,661	$ 28,316
Fair Value, Net Asset (Liability), Total		36,267	25,421
Reported Value Measurement [Member] | Contingent Receivable [Member]
Derivative Asset, Current	[1]	101	102
Reported Value Measurement [Member] | Currency Forward Contracts [Member]
Derivative Asset, Current	[2]	2,405	362
Reported Value Measurement [Member] | Contingent Payable [Member]
Derivative Liability, Current	[1]	(2,900)	(3,359)
Estimate of Fair Value Measurement [Member]
Cash equivalents (including restricted cash accounts)		36,661	28,316
Fair Value, Net Asset (Liability), Total		36,267	25,421
Estimate of Fair Value Measurement [Member] | Contingent Receivable [Member]
Derivative Asset, Current	[1]	101	102
Estimate of Fair Value Measurement [Member] | Currency Forward Contracts [Member]
Derivative Asset, Current	[2]	2,405	362
Estimate of Fair Value Measurement [Member] | Contingent Payable [Member]
Derivative Liability, Current	[1]	(2,900)	(3,359)
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Cash equivalents (including restricted cash accounts)		36,661	28,316
Fair Value, Net Asset (Liability), Total		36,661	28,316
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	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
Fair Value, Net Asset (Liability), Total		2,405	362
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]	2,405	362
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
Fair Value, Net Asset (Liability), Total		(2,799)	(3,257)
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Contingent Receivable [Member]
Derivative Asset, Current	[1]	101	102
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Currency Forward Contracts [Member]
Derivative Asset, Current	[2]	0	0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Contingent Payable [Member]
Derivative Liability, Current	[1]	$ (2,900)	$ (3,359)
[1]	These amounts relate to contingent receivables and payables relating to acquisition of the Guadeloupe power plant, 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 June 30, 2020 and December 31, 2019 in the consolidated balance sheets with the corresponding gain or loss being recognized within "Derivatives and foreign currency transaction gains (losses)" in the condensed consolidated statements 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 “Prepaid expenses and other” and “Accounts payable and accrued expenses”, as applicable, on June 30, 2020 and December 31, 2019, in the condensed 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.

Note 4 - Fair Value of Financ_4

Note 4 - 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	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Amount of gain (loss) recognized	$ 1,435	$ 616	$ 2,525	$ 1,699
Foreign Currency Gain (Loss) [Member] | Currency Forward Contracts [Member]
Amount of gain (loss) recognized	$ 1,435	$ 616	$ 2,525	$ 1,699

Note 4 - Fair Value of Financ_5

Note 4 - Fair Value of Financial Instruments - Fair Value of Long-term Debt Approximates Its Carrying Amount, Exceptions (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Estimate of Fair Value Measurement [Member]
Other long-term debt	$ 16.4	$ 16.3
Reported Value Measurement [Member]
Other long-term debt	16.7	17.4
Olkaria III OPIC [Member]
Loans	203.4	202.1
Olkaria III OPIC [Member] | Estimate of Fair Value Measurement [Member]
Loans	203.4	202.1
Olkaria III OPIC [Member] | Reported Value Measurement [Member]
Loans	183.6	192.6
Olkaria III Plant 4 Loan - DEG 2 [Member]
Loans	43.2	43.8
Olkaria III Plant 4 Loan - DEG 2 [Member] | Estimate of Fair Value Measurement [Member]
Loans	43.2	43.8
Olkaria III Plant 4 Loan - DEG 2 [Member] | Reported Value Measurement [Member]
Loans	40	42.5
Olkaria III plant 1 Loan - DEG 3 [Member]
Loans	38.3	38.8
Olkaria III plant 1 Loan - DEG 3 [Member] | Estimate of Fair Value Measurement [Member]
Loans	38.3	38.8
Olkaria III plant 1 Loan - DEG 3 [Member] | Reported Value Measurement [Member]
Loans	34.9	37.1
Platanares Loan - OPIC [Member]
Loans	117.7	115.3
Platanares Loan - OPIC [Member] | Estimate of Fair Value Measurement [Member]
Loans	117.7	115.3
Platanares Loan - OPIC [Member] | Reported Value Measurement [Member]
Loans	100.4	104.5
Amatitlan Loan [Member]
Loans	24.6	26.4
Amatitlan Loan [Member] | Estimate of Fair Value Measurement [Member]
Loans	24.6	26.4
Amatitlan Loan [Member] | Reported Value Measurement [Member]
Loans	24.5	26.3
OFC Two Senior Secured Notes [Member] | Estimate of Fair Value Measurement [Member]
Notes	222.6	210.9
OFC Two Senior Secured Notes [Member] | Reported Value Measurement [Member]
Notes	198.4	203
Don A. Campbell 1 ("DAC1") [Member]
Notes	81.2	78.5
Don A. Campbell 1 ("DAC1") [Member] | Estimate of Fair Value Measurement [Member]
Notes	81.2	78.5
Don A. Campbell 1 ("DAC1") [Member] | Reported Value Measurement [Member]
Notes	75.2	78.2
USG Prudential - NV [Member]
Notes	33	30.6
USG Prudential - NV [Member] | Estimate of Fair Value Measurement [Member]
Notes	33	30.6
USG Prudential - NV [Member] | Reported Value Measurement [Member]
Notes	28.2	28.4
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	18.8	19.6
USG DOE [Member]
Notes	47.1	45
USG DOE [Member] | Estimate of Fair Value Measurement [Member]
Notes	47.1	45
USG DOE [Member] | Reported Value Measurement [Member]
Notes	39.5	40.8
Senior Unsecured Bonds [Member]
Senior Unsecured debt	294.8	205.7
Senior Unsecured Bonds [Member] | Estimate of Fair Value Measurement [Member]
Senior Unsecured debt	294.8	205.7
Senior Unsecured Bonds [Member] | Reported Value Measurement [Member]
Senior Unsecured debt	285.2	204.3
Senior Unsecured Loan [Member]
Senior Unsecured debt	231.5	161.3
Senior Unsecured Loan [Member] | Estimate of Fair Value Measurement [Member]
Senior Unsecured debt	231.5	161.3
Senior Unsecured Loan [Member] | Reported Value Measurement [Member]
Senior Unsecured debt	200	150
Plumstriker Loan Agreement [Member]
Loans	20
Senior Unsecured debt		21.7
Plumstriker Loan Agreement [Member] | Estimate of Fair Value Measurement [Member]
Loans	20	21.7
Plumstriker Loan Agreement [Member] | Reported Value Measurement [Member]
Loans	$ 20	$ 21.6

Note 4 - Fair Value of Financ_6

Note 4 - Fair Value of Financial Instruments - Fair Value of Financial Instruments (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Revolving lines of credit	$ 100.1	$ 40.6
Deposits	12.2	12.2
Commercial Paper [Member]
Commercial paper	3.8	50
Olkaria III OPIC [Member]
Loans	203.4	202.1
Olkaria III Plant 4 Loan - DEG 2 [Member]
Loans	43.2	43.8
Olkaria III plant 1 Loan - DEG 3 [Member]
Loans	38.3	38.8
Platanares Loan - OPIC [Member]
Loans	117.7	115.3
Amatitlan Loan [Member]
Loans	24.6	26.4
OFC Senior Secured Notes [Member]
Notes	222.6	210.9
Don A. Campbell 1 ("DAC1") [Member]
Notes	81.2	78.5
USG Prudential - NV [Member]
Notes	33	30.6
USG Prudential - ID [Member]
Notes	18.6	18.6
USG DOE [Member]
Notes	47.1	45
Senior Unsecured Bonds [Member]
Senior Unsecured debt	294.8	205.7
Senior Unsecured Loan [Member]
Senior Unsecured debt	231.5	161.3
Plumstriker Loan Agreement [Member]
Loans	20
Senior Unsecured debt		21.7
Other Long-term Debt [Member]
Senior Unsecured debt	16.4	16.3
Fair Value, Inputs, Level 1 [Member]
Revolving lines of credit	0	0
Deposits	12.2	12.2
Fair Value, Inputs, Level 1 [Member] | Commercial Paper [Member]
Commercial paper	0	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	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] | 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
Senior Unsecured debt		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	100.1	40.6
Deposits	0	0
Fair Value, Inputs, Level 2 [Member] | Commercial Paper [Member]
Commercial paper	3.8	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	0
Fair Value, Inputs, Level 2 [Member] | Platanares Loan - OPIC [Member]
Loans	0	0
Fair Value, Inputs, Level 2 [Member] | Amatitlan Loan [Member]
Loans	24.6	26.4
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	20
Senior Unsecured debt		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	0
Fair Value, Inputs, Level 3 [Member] | Olkaria III OPIC [Member]
Loans	203.4	202.1
Fair Value, Inputs, Level 3 [Member] | Olkaria III Plant 4 Loan - DEG 2 [Member]
Loans	43.2	43.8
Fair Value, Inputs, Level 3 [Member] | Olkaria III plant 1 Loan - DEG 3 [Member]
Loans	38.3	38.8
Fair Value, Inputs, Level 3 [Member] | Platanares Loan - OPIC [Member]
Loans	117.7	115.3
Fair Value, Inputs, Level 3 [Member] | Amatitlan Loan [Member]
Loans	0	0
Fair Value, Inputs, Level 3 [Member] | OFC Senior Secured Notes [Member]
Notes	222.6	210.9
Fair Value, Inputs, Level 3 [Member] | Don A. Campbell 1 ("DAC1") [Member]
Notes	81.2	78.5
Fair Value, Inputs, Level 3 [Member] | USG Prudential - NV [Member]
Notes	33	30.6
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	47.1	45
Fair Value, Inputs, Level 3 [Member] | Senior Unsecured Bonds [Member]
Senior Unsecured debt	294.8	205.7
Fair Value, Inputs, Level 3 [Member] | Senior Unsecured Loan [Member]
Senior Unsecured debt	231.5	161.3
Fair Value, Inputs, Level 3 [Member] | Plumstriker Loan Agreement [Member]
Loans	0
Senior Unsecured debt		0
Fair Value, Inputs, Level 3 [Member] | Other Long-term Debt [Member]
Senior Unsecured debt	$ 16.4	$ 16.3

Note 5 - Stock-based Compensa_3

Note 5 - Stock-based Compensation (Details Textual) - The 2018 Incentive Plan [Member] - $ / shares	Jun. 15, 2020	May 12, 2020
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	852,475	46,795
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Exercise Price (in dollars per share)	$ 69.14	$ 68.34
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)	6 years	6 years
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)	$ 18	$ 17.6
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	11,068	6,142
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)	$ 68	$ 67.2
Performance Stock Units (PSU) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	10,962	5,637
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value (in dollars per share)	$ 65	$ 73.2
SARs, RSUs, and PSUs [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	2 years	2 years
SARs, RSUs, and PSUs [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year)	4 years	4 years
Stock Appreciation Rights, Expiratiopn Period 2 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)	1,156
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year)	5 months

Note 5 - Stock-based Compensa_4

Note 5 - Stock-based Compensation - Fair Value of Stock-based Award on the Date of Grant (Details)	Jun. 15, 2020	May 12, 2020
May 2020 SARs [Member]
Risk-free interest rates		0.44%
Expected life (in years) (Year)		2 years 9 months 18 days
Dividend yield		0.63%
Expected volatility (weighted average)		28.14%
June 2020 SARs [Member]
Dividend yield	0.64%
June 2020 SARs [Member] | Minimum [Member]
Risk-free interest rates	0.44%
Expected life (in years) (Year)	2 years
Expected volatility (weighted average)	28.50%
June 2020 SARs [Member] | Maximum [Member]
Risk-free interest rates	0.28%
Expected life (in years) (Year)	2 years 9 months 18 days
Expected volatility (weighted average)	35.20%

Note 6 - Interest Expense, Ne_2

Note 6 - Interest Expense, Net - Components of Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Interest related to sale of tax benefits	$ 2,500	$ 3,155	$ 4,824	$ 6,816
Interest expense	19,634	18,821	36,800	36,383
Less — amount capitalized	(2,349)	(459)	(4,566)	(459)
Total interest expense, net	$ 19,785	$ 21,517	$ 37,058	$ 42,740

Note 7 - Earnings Per Share (De

Note 7 - Earnings Per Share (Details Textual) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	141,328	174,334	132,941	228,775

Note 7 - Earnings Per Share - S

Note 7 - Earnings Per Share - Shares Used to Calculate Earnings Per Share (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Weighted average number of shares used in computation of basic earnings per share add: (in shares)	51,043	50,800	51,040	50,757
Additional shares from the assumed exercise of employee stock options (in shares)	319	294	408	301
Weighted average number of shares used in computation of diluted earnings per share (in shares)	51,362	51,094	51,448	51,058

Note 8 - Business Segments (Det

Note 8 - Business Segments (Details Textual) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020USD ($)	Jun. 30, 2019USD ($)	Jun. 30, 2020USD ($)	Jun. 30, 2019USD ($)	Dec. 31, 2019USD ($)
Number of Reportable Segments			3
Revenue from Contract with Customer, Including Assessed Tax	$ 174,900	$ 184,065	$ 367,013	$ 383,103
Goodwill, Ending Balance	20,120		20,120		$ 20,140
Electricity Segment [Member]
Revenue from Contract with Customer, Including Assessed Tax	128,685	129,079	271,541	271,987
Goodwill, Ending Balance	20,100	20,200	20,100	20,200
Electricity Segment [Member] | Accounting Standards Update 2014-09 [Member]
Revenue from Contract with Customer, Including Assessed Tax	15,600	32,400	12,900	29,900
Product and Energy Storage and Management Services Segments [Member]
Goodwill, Ending Balance	$ 0	$ 0	$ 0	$ 0

Note 8 - Business Segments - Su

Note 8 - Business Segments - Summarized Financial Information Concerning Reportable Segments (Details) - USD ($) $ in Thousands		3 Months Ended				6 Months Ended
		Jun. 30, 2020		Jun. 30, 2019		Jun. 30, 2020		Jun. 30, 2019		Dec. 31, 2019
Revenues		$ 174,900		$ 184,065		$ 367,013		$ 383,103
Operating income (loss)		48,075		46,880		109,132		100,605
Segment assets at period end		3,418,377	[1],[2]	3,193,781	[2],[3]	3,418,377	[1],[2]	3,193,781	[2],[3]	$ 3,250,494
Intersegment Eliminations [Member]
Revenues		50,453		19,167		59,109		37,428
Segment Reconciling Items [Member]
Segment assets at period end		84,414		71,047		84,414		71,047
Electricity Segment [Member]
Revenues		128,685		129,079		271,541		271,987
Operating income (loss)		45,875		43,475		104,505		95,026
Segment assets at period end	[2]	3,150,770	[1]	2,992,891	[3]	3,150,770	[1]	2,992,891	[3]
Electricity Segment [Member] | Intersegment Eliminations [Member]
Revenues		0		0		0		0
Electricity Segment [Member] | Segment Reconciling Items [Member]
Segment assets at period end		84,414		71,047		84,414		71,047
Product Segment [Member]
Revenues		43,701		52,030		91,112		104,158
Operating income (loss)		3,803		5,307		7,675		9,559
Segment assets at period end	[2]	190,474	[1]	128,524	[3]	190,474	[1]	128,524	[3]
Product Segment [Member] | Intersegment Eliminations [Member]
Revenues		50,453		19,167		59,109		37,428
Product Segment [Member] | Segment Reconciling Items [Member]
Segment assets at period end		0		0		0		0
Other Segments [Member]
Revenues		2,514		2,956		4,360		6,958
Operating income (loss)		(1,603)		(1,902)		(3,048)		(3,980)
Segment assets at period end	[2]	77,133	[1]	72,366	[3]	77,133	[1]	72,366	[3]
Other Segments [Member] | Intersegment Eliminations [Member]
Revenues		0		0		0		0
Other Segments [Member] | Segment Reconciling Items [Member]
Segment assets at period end		0		0		0		0
UNITED STATES
Revenues	[4]	85,210		92,419		179,146		199,192
UNITED STATES | Electricity Segment [Member]
Revenues	[4]	80,427		76,931		172,119		168,459
UNITED STATES | Product Segment [Member]
Revenues	[4]	2,269		12,532		2,667		23,775
UNITED STATES | Other Segments [Member]
Revenues	[4]	2,514		2,956		4,360		6,958
Non-US [Member]
Revenues	[5]	89,690		91,646		187,867		183,911
Non-US [Member] | Electricity Segment [Member]
Revenues	[5]	48,258		52,148		99,422		103,528
Non-US [Member] | Product Segment [Member]
Revenues	[5]	41,432		39,498		88,445		80,383
Non-US [Member] | Other Segments [Member]
Revenues	[5]	$ 0		$ 0		$ 0		$ 0
[1]	* Including unconsolidated investments 84,414 - - 84,414
[2]	Electricity segment assets include goodwill in the amount of $20.1 million and $20.2 million as of June 30, 2020 and 2019, respectively. No goodwill is included in the Product and ESMS segment assets as of June 30, 2020 and 2019.
[3]	Including unconsolidated investments 71,047 - - 71,047
[4]	Electricity segment revenues in the United States are all accounted under lease accounting except for 15.6 million and $32.4 million in the three and six months ended June 30, 2020, respectively, that are accounted under ASC 606. For the three and six months ended June 30, 2019, Electricity segment revenues in the United States are all accounted under lease accounting except for 12.9 million and 29.9 million, respectively, that are accounted under ASC 606. Product and ESMS segment revenues in the United States are accounted under ASC 606.
[5]	Electricity segment revenues in foreign countries are all accounted under lease accounting. Product segment revenues in foreign countries are accounted under ASC 606.

Note 8 - Business Segments - Re

Note 8 - Business Segments - Reconciling Information Between Reportable Segments and Consolidated Totals (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue	$ 174,900	$ 184,065	$ 367,013	$ 383,103
Operating income (loss)	48,075	46,880	109,132	100,605
Interest income	441	420	843	713
Interest expense, net	(19,785)	(21,517)	(37,058)	(42,740)
Derivatives and foreign currency transaction gains (losses)	671	19	1,064	491
Income attributable to sale of tax benefits	5,672	4,637	9,804	12,401
Other non-operating income (expense), net	304	1,027	382	1,118
Total consolidated income before income taxes and equity in income of investees	35,378	31,466	84,167	72,588
Intersegment Eliminations [Member]
Revenue	50,453	19,167	59,109	37,428
Consolidation, Eliminations [Member]
Revenue	$ (50,453)	$ (19,167)	$ (59,109)	$ (37,428)

Note 9 - Commitments and Cont_2

Note 9 - Commitments and Contingencies (Details Textual) - Former Local Sales Representative vs. Ormat [Member] - Pending Litigation [Member] $ in Millions	Mar. 29, 2016USD ($)
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 (Year)	10 years

Note 10 - Income Taxes (Details

Note 10 - Income Taxes (Details Textual) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Effective Income Tax Rate Reconciliation, Percent, Total	33.30%	(11.20%)	35.50%	14.50%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent			21.00%
Foreign Tax Authority [Member] | Kenya Revenue Authority [Member] | First and Second Assessment Tax Years 2013-2017 [Member]
Income Tax Examination, Assessment	$ 157		$ 157
Income Tax Examination, Penalties and Interest Accrued, Total	42		42
Foreign Tax Authority [Member] | Kenya Revenue Authority [Member] | Third Assessment Tax Years 2013-2017 [Member]
Income Tax Examination, Assessment	3		3
Income Tax Examination, Penalties and Interest Accrued, Total	$ 1		$ 1

Note 11 - Subsequent Events (De

Note 11 - Subsequent Events (Details Textual) $ / shares in Units, $ in Thousands, ₪ in Billions	Aug. 04, 2020USD ($)$ / shares	Jul. 20, 2020USD ($)	Jun. 30, 2020USD ($)	Mar. 31, 2020USD ($)	Jun. 30, 2019USD ($)	Mar. 31, 2019USD ($)	Jul. 01, 2020USD ($)	Jul. 01, 2020ILS (₪)
Dividends, Common Stock, Total			$ 5,719	$ 5,614	$ 5,589	$ 5,579
Subsequent Event [Member]
Dividends, Common Stock, Total	$ 5,600
Common Stock, Dividends, Per Share, Declared (in dollars per share) | $ / shares	$ 0.11
Dividends Payable, Date of Record	Aug. 18, 2020
Dividends Payable, Date to be Paid	Sep. 1, 2020
Subsequent Event [Member] | Pomona Energy Storage [Member] | Southern California Edison Company [Member]
Energy Storage Resource Agreement, Term (Year)		10 years
Subsequent Event [Member] | Pomona Energy Storage [Member]
Business Combination, Consideration Transferred, Total		$ 43,900
Business Acquisition, Percentage of Voting Interests Acquired		100.00%
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Working Capital		$ 3,100
Senior Unsecured Bonds, Series 4 [Member] | Subsequent Event [Member]
Debt Instrument, Face Amount							$ 290,000	₪ 1
Debt Instrument, Interest Rate, Stated Percentage							3.35%	3.35%
Debt Instrument, Number of Annual Payments							10	10
Senior Unsecured Bonds, Series 4 [Member] | Subsequent Event [Member] | Cross Currency Interest Rate Contract [Member]
Derivative, Fixed Interest Rate							4.34%	4.34%