Ormat (ORA) 10-Q 6 May 21 2021 Q1 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	3 Months Ended
	Mar. 31, 2021	Apr. 30, 2021
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	Q1
Document Fiscal Year Focus	2021
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2021
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		55,984,392
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		Mar. 31, 2021		Dec. 31, 2020
Current assets:
Cash and cash equivalents		$ 376,630		$ 448,252
Marketable securities at fair value		27,735		0
Restricted cash and cash equivalents (primarily related to VIEs)		88,449		88,526
Receivables:
Trade less allowance for credit losses of $597 and $597, respectively (primarily related to VIEs)		139,711		149,170
Other		10,513		17,987
Inventories		38,408		35,321
Costs and estimated earnings in excess of billings on uncompleted contracts	[1]	20,876		24,544
Prepaid expenses and other		22,613		15,354
Total current assets		724,935		779,154
Investment in unconsolidated companies		104,519		98,217
Deposits and other		52,956		66,989
Deferred income taxes		119,217		119,299
Property, plant and equipment, net		2,148,589		2,099,046
Construction-in-process		471,548		479,315
Operating leases right of use		15,627		16,347
Finance leases right of use		8,336		11,633
Intangible assets, net		189,249		194,421
Goodwill		24,237		24,566
Total assets		3,859,213	[2],[3]	3,888,987
Current liabilities:
Accounts payable and accrued expenses		148,071		152,763
Billings in excess of costs and estimated earnings on uncompleted contracts		12,686		11,179
Current portion of long-term debt:
Senior secured notes		24,963		24,949
Other loans		36,240		35,897
Full recourse		26,168		17,768
Operating lease liabilities		2,935		2,922
Finance lease liabilities		3,171		3,169
Total current liabilities		254,234		248,647
Long-term debt, net of current portion:
Senior secured notes (less deferred financing costs of $5,082 and $5,318, respectively)		306,891		315,195
Senior unsecured bonds (less deferred financing costs of $1,996 and $2,086, respectively)		698,271		717,534
Operating lease liabilities		12,332		12,897
Finance lease liabilities		5,851		9,104
Liability associated with sale of tax benefits		107,105		111,476
Deferred income taxes		87,421		87,972
Liability for unrecognized tax benefits		3,094		1,970
Liabilities for severance pay		18,202		18,749
Asset retirement obligation		64,354		63,457
Other long-term liabilities		6,086		6,235
Total liabilities		1,899,628		1,937,720
Commitments and contingencies (Note 10)
Redeemable noncontrolling interest		9,706		9,830
Equity:
Common stock, par value $0.001 per share; 200,000,000 shares authorized; 55,984,392 and 55,983,259 issued and outstanding as of March 31, 2021 and December 31, 2020, respectively		56		56
Additional paid-in capital		1,264,828		1,262,446
Retained earnings		558,644		550,103
Accumulated other comprehensive income (loss)		(6,920)		(6,620)
Total stockholders' equity attributable to Company's stockholders		1,816,608		1,805,985
Noncontrolling interest		133,271		135,452
Total equity		1,949,879		1,941,437
Total liabilities, redeemable noncontrolling interest and equity		3,859,213		3,888,987
Other Loans, Limited and Non-recourse [Member]
Long-term debt, net of current portion:
Other loans (less deferred financing costs)		276,186		284,928
Other Loans, Full Recourse [Member]
Long-term debt, net of current portion:
Other loans (less deferred financing costs)		$ 59,601		$ 59,556
[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 not yet recognized as product revenues during the three months ended March 31, 2021 as a result of performance obligations having been satisfied.
[2]	Electricity segment assets include goodwill in the amount of $20.1 million and $20.0 million as of March 31, 2021 and 2020, respectively. Energy Storage segment assets include goodwill in the amount of $4.1 million and none as of March 31, 2021 and 2020, respectively. No goodwill is included in the Product segment assets as of March 31, 2021 and 2020.
[3]	Including unconsolidated investments

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Trade, allowance for credit losses	$ 597	$ 597
Property, plant and equipment, net	2,148,589	2,099,046
Construction-in-process	471,548	479,315
Operating leases right of use	15,627	16,347
Finance leases right of use	$ 8,336	$ 11,633
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)	55,984,392	55,983,259
Common stock, shares outstanding (in shares)	55,984,392	55,983,259
Variable Interest Entity, Primary Beneficiary [Member]
Property, plant and equipment, net	$ 2,012,052	$ 1,978,220
Construction-in-process	208,972	198,812
Operating leases right of use	4,589	4,712
Finance leases right of use	289	7,001
Senior Secured Notes [Member]
Deferred financing costs	5,082	5,318
Other Loans, Limited and Non-recourse [Member]
Deferred financing costs	8,132	8,557
Senior Unsecured Bonds [Member]
Deferred financing costs	1,996	2,086
Other Loans, Full Recourse [Member]
Deferred financing costs	$ 1,295	$ 1,340

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenues:
Revenue	$ 166,352	$ 192,113
Cost of revenues:
Cost of revenues	92,705	110,295
Gross profit	73,647	81,818
Operating expenses:
Research and development expenses	876	1,619
Selling and marketing expenses	4,276	4,794
General and administrative expenses	18,606	16,745
Business interruption insurance income	0	(2,397)
Operating income	49,889	61,057
Other income (expense):
Interest income	263	402
Interest expense, net	(19,016)	(17,273)
Derivatives and foreign currency transaction gains (losses)	(16,866)	393
Income attributable to sale of tax benefits	6,355	4,132
Other non-operating income (expense), net	(331)	78
Income from operations before income tax and equity in earnings (losses) of investees	20,294	48,789
Income tax (provision) benefit	(3,007)	(18,148)
Equity in earnings (losses) of investees, net	542	(735)
Net income	17,829	29,906
Net income attributable to noncontrolling interest	(2,570)	(3,873)
Net income attributable to the Company's stockholders	15,259	26,033
Comprehensive income:
Net income	17,829	29,906
Other comprehensive income (loss), net of related taxes:
Change in foreign currency translation adjustments	(1,826)	(645)
Change in unrealized gains or losses in respect of the Company's share in derivatives instruments of unconsolidated investment	3,755	(4,755)
Change in unrealized gains or losses in respect of a cross currency swap derivative instrument that qualifies as a cash flow hedge	(2,798)	0
Change in unrealized gains or losses on marketable securities available-for-sale (net of related tax of $0)	(20)	0
Other changes in comprehensive income	16	5
Comprehensive income	16,956	24,511
Comprehensive income attributable to noncontrolling interest	(1,997)	(3,486)
Comprehensive income attributable to the Company's stockholders	$ 14,959	$ 21,025
Earnings per share attributable to the Company's stockholders:
Basic: (in dollars per share)	$ 0.27	$ 0.51
Diluted: (in dollars per share)	$ 0.27	$ 0.51
Weighted average number of shares used in computation of earnings per share attributable to the Company's stockholders:
Basic (in shares)	55,988	51,036
Diluted (in shares)	56,735	51,526
Electricity [Member]
Revenues:
Revenue	$ 144,988	$ 142,856
Cost of revenues:
Cost of revenues	79,851	71,368
Product [Member]
Revenues:
Revenue	8,643	47,411
Cost of revenues:
Cost of revenues	8,074	36,978
Energy Storage and Management Services [Member]
Revenues:
Revenue	12,721	1,846
Cost of revenues:
Cost of revenues	$ 4,780	$ 1,949

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) (Parentheticals) $ in Thousands	3 Months Ended
	Mar. 31, 2021USD ($)
Change in unrealized gains or losses on marketable securities available-for-sale, tax	$ 0

Condensed Consolidated Statem_3

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]	Cross Currency Interest Rate Contract [Member]Common Stock [Member]	Cross Currency Interest Rate Contract [Member]Additional Paid-in Capital [Member]	Cross Currency Interest Rate Contract [Member]Retained Earnings [Member]	Cross Currency Interest Rate Contract [Member]AOCI Attributable to Parent [Member]	Cross Currency Interest Rate Contract [Member]Parent [Member]	Cross Currency Interest Rate Contract [Member]Noncontrolling Interest [Member]	Cross Currency Interest Rate Contract [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, 2019								51,032														51,032
Balance in Other comprehensive income (loss) beginning of period 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 stock-based awards by employees and directors (in shares)																						4
Exercise of stock-based awards 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)
Increase in noncontrolling interest																						0	0	0	0	0	1,447	1,447
Net income																						0	0	26,033	0	26,033	3,543	29,576
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							0
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)
Change in unrealized gains or losses on marketable securities available-for-sale (net of related tax of $0)																												0
Other comprehensive income (loss)																												5
Balance (in shares) at Mar. 31, 2020																						51,036
Balance in Other comprehensive income (loss) end of period 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, 2020																						55,983
Balance in Other comprehensive income (loss) beginning of period at Dec. 31, 2020																						$ 56	1,262,446	550,103	(6,620)	1,805,985	135,452	1,941,437
Stock-based compensation																						$ 0	2,097	0	0	2,097	0	2,097
Exercise of stock-based awards by employees and directors (in shares)																						1
Exercise of stock-based awards by employees and directors																						$ 0	0	0	0	0	0	0
Cash paid to noncontrolling interest																						0	0	0	0	0	(3,898)	(3,898)
Cash dividend declared																						0	0	(6,718)	0	(6,718)	0	(6,718)
Net income																						0	0	15,259	0	15,259	2,290	17,549
Foreign currency translation adjustments																						0	0	0	(1,253)	(1,253)	(573)	(1,826)
Change in respect of derivative instruments designated for cash flow hedge															$ 0	$ 0	$ 0	$ (2,798)	$ (2,798)	$ 0	$ (2,798)							(2,798)
Change in unrealized gains or losses in respect of the Company's share in derivative instruments of unconsolidated investment																						0	0	0	3,755	3,755	0	3,755
Stock issuance costs reimbursement																						0	285	0	0	285	0	285
Change in unrealized gains or losses on marketable securities available-for-sale (net of related tax of $0)																						0	0	0	(20)	(20)	0	(20)
Other comprehensive income (loss)																						$ 0	0	0	16	16	0	16
Balance (in shares) at Mar. 31, 2021																						55,984
Balance in Other comprehensive income (loss) end of period at Mar. 31, 2021																						$ 56	$ 1,264,828	$ 558,644	$ (6,920)	$ 1,816,608	$ 133,271	$ 1,949,879

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Equity (Unaudited) (Parentheticals) $ in Thousands	3 Months Ended
	Mar. 31, 2020$ / shares
Retained Earnings [Member]
Cash dividend declared, per share (in dollars per share)	$ 0.11

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Cash Flow (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities:
Net income	$ 17,829	$ 29,906
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	42,100	36,952
Accretion of asset retirement obligation	955	772
Stock-based compensation	2,097	1,989
Income attributable to sale of tax benefits, net of interest expense	(4,245)	(2,087)
Equity in losses (earnings) of investees	(542)	735
Mark-to-market of derivative instruments	2,086	(561)
Loss on disposal of property, plant and equipment	91	88
Loss (gain) on severance pay fund asset	358	535
Deferred income tax provision	(83)	15,123
Liability for unrecognized tax benefits	1,124	(83)
Changes in operating assets and liabilities, net of businesses acquired:
Receivables	8,856	(25,008)
Costs and estimated earnings in excess of billings on uncompleted contracts	3,668	16,060
Inventories	(3,087)	842
Prepaid expenses and other	(7,259)	1,211
Change in operating lease right of use asset	658	784
Deposits and other	92	343
Accounts payable and accrued expenses	3,794	350
Billings in excess of costs and estimated earnings on uncompleted contracts	1,507	3,182
Liabilities for severance pay	(547)	(543)
Change in operating lease liabilities	(493)	(734)
Other long-term liabilities	(35)	(100)
Net cash provided by operating activities	68,924	79,756
Cash flows from investing activities:
Purchase of marketable securities	(27,755)	0
Capital expenditures	(87,896)	(80,375)
Investment in unconsolidated companies	(2,005)	(358)
Decrease (increase) in severance pay fund asset, net of payments made to retired employees	182	(87)
Net cash used in investing activities	(117,474)	(80,820)
Cash flows from financing activities:
Repayments of commercial paper and prepayment of loans	0	(41,725)
Proceeds from revolving credit lines with banks	0	872,900
Repayment of revolving credit lines with banks	0	(642,950)
Cash received from noncontrolling interest	5,390	6,270
Repayments of long-term debt	(16,573)	(16,416)
Stock issuance costs reimbursement	285	0
Cash paid to noncontrolling interest	(4,197)	(3,279)
Payments under finance lease obligations	(764)	(675)
Deferred debt issuance costs	(230)	(416)
Cash dividends paid	(6,718)	(5,614)
Net cash provided by (used in) financing activities	(22,807)	168,095
Effect of exchange rate changes	(342)	(365)
Net change in cash and cash equivalents and restricted cash and cash equivalents	(71,699)	166,666
Cash and cash equivalents and restricted cash and cash equivalents at beginning of period	536,778	153,110
Cash and cash equivalents and restricted cash and cash equivalents at end of period	465,079	319,776
Supplemental non-cash investing and financing activities:
Increase (decrease) in accounts payable related to purchases of property, plant and equipment	(8,732)	(1,436)
Right of use assets obtained in exchange for new lease liabilities	$ 467	$ 1,194

Note 1 - General and Basis of P

Note 1 - General and Basis of Presentation	3 Months Ended
	Mar. 31, 2021
Notes to Financial Statements
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	NOTE 1 GENERAL AND BASIS OF PRESENTATION 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 March 31, 2021, three March 31, 2021 2020 three March 31, 2021 2020. 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, 2020. December 31, 2020 December 31, 2020 not Dollar amounts, except per share data, in the notes to these financial statements are rounded to the closest $1,000. COVID- 19 In March 2020, 19" first 2021, one April 2021. not 19 19 2020 19 2020 2020 first 2021. In the Product segment, the Company experienced a significant decline in product backlog, which it believes resulted mainly due to the impact of COVID- 19 In the Energy Storage segment, revenues are generated primarily from participating in the energy and ancillary services markets and therefore are directly impacted by the prevailing energy prices in those markets. While the extent and duration of the economic downturn from the COVID- 19 may 19 no Puna Power Plant On May 3, 2018, 38 three not first 2021, not The Puna power plant resumed operations in November 2020 20 one second 2021. two 2021, In December 2019, 2052 46 no March 31, 2021, The Company continues to assess the accounting implications of these events on its assets and liabilities and whether any related assets may March 31, 2021, no February In February 2021, one February 15, 2021, 3 3" February 16, 2021 February 19, 2021, not February 19, 2021, In addition, the Company recorded a provision for approximately $3.0 million for receivables related to imbalance charges from the grid operator in respect of its demand response operation as it estimated it is probable it may The Company is currently in discussions with ERCOT with respect to some of the imbalance charges and revenue allocated to its Demand Response services and customers, the outcome of which at may Write-offs of unsuccessful exploration activities There were no three March 31, 2021 2020. 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: March 31, December 31, March 31, 2021 2020 2020 (Dollars in thousands) Cash and cash equivalents $ 376,630 $ 448,252 $ 231,149 Restricted cash and cash equivalents 88,449 88,526 88,627 Total Cash and cash equivalents and restricted cash and cash equivalents $ 465,079 $ 536,778 $ 319,776 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 March 31, 2021 December 31, 2020, ten $250,000 March 31, 2021 December 31, 2020, At March 31, 2021 December 31, 2020, March 31, 2021 December 31, 2020, 10% The Company's revenues from its primary customers as a percentage of total revenues are as follows: Three Months Ended March 31, 2021 2020 Sierra Pacific Power Company and Nevada Power Company 21.4 % 19.2 % Southern California Public Power Authority (“SCPPA”) 24.9 18.7 Kenya Power and Lighting Co. Ltd. ("KPLC") 15.6 15.4 The Company has historically been able to collect on substantially all of its receivable balances. As of March 31, 2021, April 2021. first 2021 In Honduras, as of March 31, 2021, April 2021. 19 may The Company may 19 A llowance for credit losses The Company performs an analysis of potential credit losses related to its financial instruments that are within the scope of ASU 2018 19, 325, may 19 19 not The following table describes the changes in the allowance for expected credit losses for the three March 31, 2021 2020 Three Months Ended March 31, 2021 2020 (Dollars in thousands) Beginning balance of the allowance for expected credit losses $ 597 $ 755 Change in the provision for expected credit losses for the period — 24 Ending balance of the allowance for expected credit losses $ 597 $ 779 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 March 31, 2021 December 31, 2020 March 31, December 31, 2021 2020 (Dollars in thousands) Contract assets (*) $ 20,876 $ 24,544 Contract liabilities (*) $ (12,686 ) $ (11,179 ) (*) 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 not three March 31, 2021 not On March 31, 2021, not Disaggregated revenues from contracts with customers for the three March 31, 2021 2020 9 Leases in which the Company is a lessor The table below presents the lease income recognized as a lessor: Three Months Ended March 31, 2021 2020 (Dollars in thousands) Lease income relating to lease payments from operating leases $ 125,746 $ 126,076 Marketable securities The Company’s investments in marketable securities consist of debt securities with maturity of up to one 90 Derivative instruments Derivative instruments (including certain derivative instruments embedded in other contracts) are measured at their fair value and recorded as either assets or liabilities unless exempted from derivative treatment as a normal purchase and sale. Changes in the fair value of derivatives not The Company maintains a risk management strategy that may

Note 2 - New Accounting Pronoun

Note 2 - New Accounting Pronouncements	3 Months Ended
	Mar. 31, 2021
Notes to Financial Statements
Accounting Standards Update and Change in Accounting Principle [Text Block]	NOTE 2 NEW ACCOUNTING PRONOUNCEMENTS New accounting pronouncements effective in the three March 31, 2021 Accounting for Income Taxes In December 2019, 2019 12, 740 2019 12 740. December 15, 2020 2019 12 January 1, 2021. not New accounting pronouncements effective in future periods There are no

Note 3 - Inventories

Note 3 - Inventories	3 Months Ended
	Mar. 31, 2021
Notes to Financial Statements
Inventory Disclosure [Text Block]	NOTE 3 INVENTORIES Inventories consist of the following: March 31, December 31, 2021 2020 (Dollars in thousands) Raw materials and purchased parts for assembly $ 14,081 $ 14,835 Self-manufactured assembly parts and finished products 24,327 20,486 Total inventories $ 38,408 $ 35,321

Note 4 - Marketable Securities

Note 4 - Marketable Securities	3 Months Ended
	Mar. 31, 2021
Notes to Financial Statements
Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block]	NOTE 4 MARKETABLE SECURITIES Marketable securities are presented at fair value and include investments in debt securities classified as available for sale. All marketable securities have maturities of less than a year. Investment in marketable securities is comprised of the following: March 31, 2021 Amortized cost Gross unrealized gains Gross unrealized losses Fair value (Dollars in thousands) Debt security type: Corporate bonds $ 17,578 $ — $ (12 ) $ 17,653 Commercial paper 7,768 — — 7,768 Money market funds 3,751 — — 3,751 Foreign issuers 2,856 — (8 ) 2,873 Municipal bonds 931 — — 937 Total debt securities available for sale $ 32,884 $ — $ (20 ) $ 32,982 As of March 31, 2021, The following table summarizes the fair value and gross unrealized losses of debt securities with unrealized losses aggregated by security type and length of time that the fair value had been below amortized cost, on an individual security basis: March 31, 2021 Less than 12 months Greater than 12 months Fair value Gross unrealized loss Fair value Gross unrealized loss (Dollars in thousands) Debt security type: Corporate bonds $ 17,653 $ (12 ) $ — $ — Commercial paper 7,768 — — — Money market funds 3,751 — — — Foreign issuers 2,873 (8 ) — — Municipal bonds 937 — — — Total debt securities available for sale $ 32,982 $ (20 ) $ — $ — There were no sales of investments in debt securities during the three March 31, 2021 2020.

Note 5 - Fair Value of Financia

Note 5 - Fair Value of Financial Instruments	3 Months Ended
	Mar. 31, 2021
Notes to Financial Statements
Fair Value Disclosures [Text Block]	NOTE 5 FAIR VALUE OF FINANCIAL INSTRUMENTS 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 March 31, 2021 December 31, 2020 March 31, 2021 Fair Value Carrying Value at March 31, 2021 Total Level 1 Level 2 Level 3 (Dollars in thousands) Assets: Current assests: Cash equivalents (including restricted cash accounts) $ 39,229 $ 39,229 $ 39,229 $ — $ — Marketable securities (including cash equivalents) 32,884 32,884 32,884 — — Derivatives: Long-term Assets: Cross currency swap (3) 14,419 14,419 — 14,419 — Liabilities: Current liabilities: Derivatives: Swap transaction on RRS prices (4) (14,540 ) (14,540 ) (14,540 ) — — Cross currency swap (3) (2,672 ) (2,672 ) — (2,672 ) — Currency forward contracts (2) (532 ) (532 ) — (532 ) — Long term liabilities: Contingent payables (1) (2,514 ) (2,514 ) — — (2,514 ) $ 66,274 $ 66,274 $ 57,573 $ 11,215 $ (2,514 ) December 31, 2020 Fair Value Carrying Value at December 31, 2020 Total Level 1 Level 2 Level 3 (Dollars in thousands) Assets Current assets: Cash equivalents (including restricted cash accounts) $ 28,653 $ 28,653 $ 28,653 $ — $ — Derivatives: Contingent receivables (1) 111 111 — — 111 Currency forward contracts (2) 1,554 1,554 — 1,554 — Long-term assets: Cross currency swap (3) 27,829 27,829 — 27,829 — Liabilities: Current liabilities: Derivatives: Contingent payables (1) (549 ) (549 ) — — (549 ) Cross currency swap (3) (2,283 ) (2,283 ) — (2,283 ) — Long-term liabilities: Contingent payables (1) (2,630 ) (2,630 ) — — (2,630 ) $ 52,685 $ 52,685 $ 28,653 $ 27,100 $ (3,068 ) 1. These amounts relate to contingent receivables and payables and warrants pertaining to the Guadeloupe power plant purchase transaction, valued primarily based on unobservable inputs and are included within “Prepaid expenses and other”, “Accounts payable and accrued expenses” and “Other long-term liabilities” on March 31, 2021 December 31, 2020, 2. These amounts relate to currency forward contracts valued primarily based on observable inputs, including forward and spot prices for currencies, net of contracted rates and then multiplied by notional amounts, and are included within “Receivables, other” and “Accounts payable and accrued expenses”, as applicable, on March 31, 2021 December 31, 2020, 3. These amounts relate to cross currency swap contracts valued primarily based on the present value of the cross currency swap future settlement prices for U.S. Dollar ("USD") and New Israeli Shekel ("NIS") zero March 31, 2021 December 31, 2020, March 31, 2021 December 31, 2020 March 31, 2021 December 31, 2020. 4. This amount relates to a price swap contract valued primarily based on observable inputs, including market prices per MWH multiplied by notional amounts, and is included within “Accounts payable and accrued expenses” on March 31, 2021 The following table presents the amounts of gain (loss) recognized in the consolidated statements of operations and comprehensive income on derivative instruments (in thousands): Amount of recognized gain (loss) Derivatives not designated as hedging instruments Location of recognized gain (loss) Three Months Ended March 31, 2021 2020 Swap transaction on RRS prices (1) Derivative and foreign currency transaction gains (losses) $ (14,540 ) $ — Currency forward contracts (1) Derivative and foreign currency transaction gains (losses) $ 85 $ 1,090 Derivatives designated as cash flow hedging instruments Cross currency swap (2) Derivative and foreign currency transaction gains (losses) $ (11,102 ) $ — ( 1 not third January 1, 2021 1 April 1, 2021. ( 2 1 There were no 1, 2 3 three March 31, 2021. The following table presents the effect of derivative instruments designated as cash flow hedges on the condensed consolidated statements of operations and comprehensive income (loss) for the three March 31, 2021: Balance in Other comprehensive income (loss) beginning of period Gain or (loss) recognized in Other comprehensive income (loss) Amount reclassified from Other comprehensive income (loss) into earnings Balance in Other comprehensive income (loss) end of period Cash flow hedge: Cross currency swap $ 3,366 $ (13,900 ) $ 11,102 $ 568 The estimated net amount of existing gain (loss) that is reported in "Accumulated other comprehensive income (loss)" as of March 31, 2021 12 June 2031. The fair value of the Company’s long-term debt approximates its carrying amount, except for the following: Fair Value Carrying Amount March 31, 2021 December 31, 2020 March 31, 2021 December 31, 2020 (Dollars in millions) (Dollars in millions) Olkaria III Loan - DFC $ 184.2 $ 192.5 $ 170.2 $ 174.7 Olkaria III plant 4 Loan - DEG 2 40.6 40.4 37.5 37.5 Olkaria III plant 1 Loan - DEG 3 35.8 35.8 32.8 32.8 Platanares Loan - DFC 107.0 112.1 94.2 96.3 Amatitlan Loan 22.6 23.5 21.9 22.8 Senior Secured Notes: OFC 2 LLC ("OFC 2") 197.5 207.9 183.6 188.2 Don A. Campbell 1 ("DAC 1") 74.4 78.5 71.5 73.1 USG Prudential - NV 30.2 31.8 27.4 27.6 USG Prudential - ID 17.4 18.3 17.6 18.4 USG DOE 41.7 45.1 36.8 38.2 Senior Unsecured Bonds 565.8 585.1 518.0 529.1 Senior Unsecured Loan 215.7 222.2 200.0 200.0 Plumstriker 17.8 18.1 17.8 18.1 Other long-term debt 16.2 17.4 16.5 17.6 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 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 March 31, 2021: Level 1 Level 2 Level 3 Total (Dollars in millions) Olkaria III - DFC $ — $ — $ 184.2 $ 184.2 Olkaria III plant 4 Loan - DEG 2 — — 40.6 40.6 Olkaria III plant 1 Loan - DEG 3 — — 35.8 35.8 Platanares Loan - DFC — — 107.0 107.0 Amatitlan Loan — 22.6 — 22.6 Senior Secured Notes: OFC 2 Senior Secured Notes — — 197.5 197.5 DAC 1 Senior Secured Notes — — 74.4 74.4 USG Prudential - NV — — 30.2 30.2 USG Prudential - ID — — 17.4 17.4 USG DOE — — 41.7 41.7 Senior Unsecured Bonds — — 565.8 565.8 Senior Unsecured Loan — — 215.7 215.7 Plumstriker — 17.8 — 17.8 Other long-term debt — — 16.2 16.2 Deposits 15.1 — — 15.1 The following table presents the fair value of financial instruments as of December 31, 2020: Level 1 Level 2 Level 3 Total (Dollars in millions) Olkaria III Loan - DFC $ — $ — $ 192.5 $ 192.5 Olkaria IV - DEG 2 — — 40.4 40.4 Olkaria IV - DEG 3 — — 35.8 35.8 Platanares Loan - DFC — — 112.1 112.1 Amatitlan Loan — 23.5 — 23.5 Senior Secured Notes: OFC 2 Senior Secured Notes — — 207.9 207.9 DAC 1 Senior Secured Notes — — 78.5 78.5 USG Prudential - NV — — 31.8 31.8 USG Prudential - ID — — 18.3 18.3 USG DOE — — 45.1 45.1 Senior Unsecured Bonds — — 585.1 585.1 Senior Unsecured Loan — — 222.2 222.2 Plumstriker — 18.1 — 18.1 Other long-term debt — — 17.4 17.4 Deposits 14.8 — — 14.8

Note 6 - Stock-based Compensati

Note 6 - Stock-based Compensation	3 Months Ended
	Mar. 31, 2021
Notes to Financial Statements
Share-based Payment Arrangement [Text Block]	NOTE 6 STOCK-BASED COMPENSATION There were no first 2021.

Note 7 - Interest Expense, Net

Note 7 - Interest Expense, Net	3 Months Ended
	Mar. 31, 2021
Notes to Financial Statements
Interest Expense Disclosure [Text Block]	NOTE 7 INTEREST EXPENSE, NET The components of interest expense are as follows: Three Months Ended March 31, 2021 2020 (Dollars in thousands) Interest related to sale of tax benefits $ 2,394 $ 2,324 Interest expense 19,674 17,166 Less — amount capitalized (3,052 ) (2,217 ) Total interest expense, net $ 19,016 $ 17,273

Note 8 - Earnings Per Share

Note 8 - Earnings Per Share	3 Months Ended
	Mar. 31, 2021
Notes to Financial Statements
Earnings Per Share [Text Block]	NOTE 8 EARNINGS PER SHARE 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 March 31, 2021 2020 Weighted average number of shares used in computation of basic earnings per share: 55,988 51,036 Additional shares from the assumed exercise of employee stock awards 747 490 Weighted average number of shares used in computation of diluted earnings per share 56,735 51,526 The number of stock-based awards that could potentially dilute future earnings per share and that were not three March 31, 2021 2020,

Note 9 - Business Segments

Note 9 - Business Segments	3 Months Ended
	Mar. 31, 2021
Notes to Financial Statements
Segment Reporting Disclosure [Text Block]	NOTE 9 BUSINESS SEGMENTS The Company has three • Under the Electricity segment, the Company builds, owns and operates geothermal, solar PV and recovered energy-based ("REG") 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 ("EPC") of geothermal and recovered energy-based power plants. • Under the Energy Storage segment, the Company provides energy storage and related services as well as services relating to the engineering, procurement, construction, operation and maintenance of energy storage units. To better reflect the significant business activities under this reporting segment, the Company has renamed this reporting segment "Energy Storage" starting with the fourth 2020. no 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 Energy Storage Consolidated (Dollars in thousands) Three Months Ended March 31, 2021: Revenues from external customers: United States (1) $ 98,976 $ 1,853 $ 12,721 $ 113,550 Foreign (2) 46,012 6,790 — 52,802 Net revenue from external customers 144,988 8,643 12,721 166,352 Intersegment revenues (4) — 25,334 — — Operating income (loss) 47,749 (1,211 ) 3,351 49,889 Segment assets at period end (3) (*) 3,577,745 140,039 141,429 3,859,213 * Including unconsolidated investments 104,519 — — 104,519 Three Months Ended March 31, 2020: Revenues from external customers: United States (1) $ 91,692 $ 398 $ 1,846 $ 93,936 Foreign (2) 51,164 47,013 — 98,177 Net revenue from external customers 142,856 47,411 1,846 192,113 Intersegment revenues (4) — 8,656 — — Operating income (loss) 58,630 3,872 (1,445 ) 61,057 Segment assets at period end (3) (*) 3,139,603 230,831 75,179 3,445,613 * Including unconsolidated investments 76,008 — — 76,008 ( 1 Electricity segment revenues in the United States are all accounted under lease accounting except for $19.2 million and $16.8 million in the three March 31, 2021 2020, 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 $20.0 million as of March 31, 2021 2020, none March 31, 2021 2020, March 31, 2021 2020. ( 4 Intersegment revenue are fully eliminated in consolidation. Reconciling information between reportable segments and the Company’s consolidated totals is shown in the following table: Three Months Ended March 31, 2021 2020 (Dollars in thousands) Revenues: Total segment revenues $ 166,352 $ 192,113 Intersegment revenues 25,334 8,656 Elimination of intersegment revenues (25,334 ) (8,656 ) Total consolidated revenues $ 166,352 $ 192,113 Operating income: Operating income $ 49,889 $ 61,057 Interest income 263 402 Interest expense, net (19,016 ) (17,273 ) Derivatives and foreign currency transaction gains (losses) (16,866 ) 393 Income attributable to sale of tax benefits 6,355 4,132 Other non-operating income (expense), net (331 ) 78 Total consolidated income before income taxes and equity in income of investees $ 20,294 $ 48,789

Note 10 - Commitments and Conti

Note 10 - Commitments and Contingencies	3 Months Ended
	Mar. 31, 2021
Notes to Financial Statements
Commitments and Contingencies Disclosure [Text Block]	NOTE 10 COMMITMENTS AND CONTINGENCIES • 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, March 3, 2021, July 2, 2020 • 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, January 21, 2021, • On September 11, 2018, October 22, 2018, four 14 2018 January 24, 2019, July 10, 2020, October 12, 2020, November 24, 2020, March 22, 2021. March 29, 2021, • On March 29, 2016, 27th 11th April 16, 2020, 11th not May 2020, October 19, 2020, two may • On March 3, 2021, 23 10 20 1934, March 1, 2021.The 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 Other matters On March 2, 2021,

Note 11 - Income Taxes

Note 11 - Income Taxes	3 Months Ended
	Mar. 31, 2021
Notes to Financial Statements
Income Tax Disclosure [Text Block]	NOTE 11 INCOME TAXES The Company’s effective tax rate expense (benefit) for the three March 31, 2021 2020 three March 31, 2021 first 2021 2019 2020, In response to the COVID- 19 March 27, 2020 three March 31, 2021, no 19

Note 12 - Subsequent Events

Note 12 - Subsequent Events	3 Months Ended
	Mar. 31, 2021
Notes to Financial Statements
Subsequent Events [Text Block]	NOTE 12 SUBSEQUENT EVENTS Cash Dividend On May 5, 2021, May 18, 2021 June 1, 2021

Significant Accounting Policies

Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2021
Accounting Policies [Abstract]
Effect of COVID-19 Pandemic, Policy [Policy Text Block]	COVID- 19 In March 2020, 19" first 2021, one April 2021. not 19 19 2020 19 2020 2020 first 2021. In the Product segment, the Company experienced a significant decline in product backlog, which it believes resulted mainly due to the impact of COVID- 19 In the Energy Storage segment, revenues are generated primarily from participating in the energy and ancillary services markets and therefore are directly impacted by the prevailing energy prices in those markets. While the extent and duration of the economic downturn from the COVID- 19 may 19 no
Puna Power Plant, Policy [Policy Text Block]	Puna Power Plant On May 3, 2018, 38 three not first 2021, not The Puna power plant resumed operations in November 2020 20 one second 2021. two 2021, In December 2019, 2052 46 no March 31, 2021, The Company continues to assess the accounting implications of these events on its assets and liabilities and whether any related assets may March 31, 2021, no
Catastrophe [Policy Text Block]	February In February 2021, one February 15, 2021, 3 3" February 16, 2021 February 19, 2021, not February 19, 2021, In addition, the Company recorded a provision for approximately $3.0 million for receivables related to imbalance charges from the grid operator in respect of its demand response operation as it estimated it is probable it may The Company is currently in discussions with ERCOT with respect to some of the imbalance charges and revenue allocated to its Demand Response services and customers, the outcome of which at may
Exploratory Drilling Costs Capitalization and Impairment, Policy [Policy Text Block]	Write-offs of unsuccessful exploration activities There were no three March 31, 2021 2020.
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: March 31, December 31, March 31, 2021 2020 2020 (Dollars in thousands) Cash and cash equivalents $ 376,630 $ 448,252 $ 231,149 Restricted cash and cash equivalents 88,449 88,526 88,627 Total Cash and cash equivalents and restricted cash and cash equivalents $ 465,079 $ 536,778 $ 319,776
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 March 31, 2021 December 31, 2020, ten $250,000 March 31, 2021 December 31, 2020, At March 31, 2021 December 31, 2020, March 31, 2021 December 31, 2020, 10% The Company's revenues from its primary customers as a percentage of total revenues are as follows: Three Months Ended March 31, 2021 2020 Sierra Pacific Power Company and Nevada Power Company 21.4 % 19.2 % Southern California Public Power Authority (“SCPPA”) 24.9 18.7 Kenya Power and Lighting Co. Ltd. ("KPLC") 15.6 15.4 The Company has historically been able to collect on substantially all of its receivable balances. As of March 31, 2021, April 2021. first 2021 In Honduras, as of March 31, 2021, April 2021. 19 may The Company may 19
Receivables, Trade and Other Accounts Receivable, Allowance for Doubtful Accounts, Policy [Policy Text Block]	llowance for credit losses The Company performs an analysis of potential credit losses related to its financial instruments that are within the scope of ASU 2018 19, 325, may 19 19 not The following table describes the changes in the allowance for expected credit losses for the three March 31, 2021 2020 Three Months Ended March 31, 2021 2020 (Dollars in thousands) Beginning balance of the allowance for expected credit losses $ 597 $ 755 Change in the provision for expected credit losses for the period — 24 Ending balance of the allowance for expected credit losses $ 597 $ 779
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 March 31, 2021 December 31, 2020 March 31, December 31, 2021 2020 (Dollars in thousands) Contract assets (*) $ 20,876 $ 24,544 Contract liabilities (*) $ (12,686 ) $ (11,179 ) (*) 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 not three March 31, 2021 not On March 31, 2021, not Disaggregated revenues from contracts with customers for the three March 31, 2021 2020 9
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 March 31, 2021 2020 (Dollars in thousands) Lease income relating to lease payments from operating leases $ 125,746 $ 126,076
Marketable Securities, Policy [Policy Text Block]	Marketable securities The Company’s investments in marketable securities consist of debt securities with maturity of up to one 90
Derivatives, Policy [Policy Text Block]	Derivative instruments Derivative instruments (including certain derivative instruments embedded in other contracts) are measured at their fair value and recorded as either assets or liabilities unless exempted from derivative treatment as a normal purchase and sale. Changes in the fair value of derivatives not The Company maintains a risk management strategy that may

Note 1 - General and Basis of_2

Note 1 - General and Basis of Presentation (Tables)	3 Months Ended
	Mar. 31, 2021
Notes Tables
Schedule of Cash and Cash Equivalents [Table Text Block]	March 31, December 31, March 31, 2021 2020 2020 (Dollars in thousands) Cash and cash equivalents $ 376,630 $ 448,252 $ 231,149 Restricted cash and cash equivalents 88,449 88,526 88,627 Total Cash and cash equivalents and restricted cash and cash equivalents $ 465,079 $ 536,778 $ 319,776
Schedules of Concentration of Risk, by Risk Factor [Table Text Block]	Three Months Ended March 31, 2021 2020 Sierra Pacific Power Company and Nevada Power Company 21.4 % 19.2 % Southern California Public Power Authority (“SCPPA”) 24.9 18.7 Kenya Power and Lighting Co. Ltd. ("KPLC") 15.6 15.4
Accounts Receivable, Allowance for Credit Loss [Table Text Block]	Three Months Ended March 31, 2021 2020 (Dollars in thousands) Beginning balance of the allowance for expected credit losses $ 597 $ 755 Change in the provision for expected credit losses for the period — 24 Ending balance of the allowance for expected credit losses $ 597 $ 779
Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block]	March 31, December 31, 2021 2020 (Dollars in thousands) Contract assets (*) $ 20,876 $ 24,544 Contract liabilities (*) $ (12,686 ) $ (11,179 )
Operating Lease, Lease Income [Table Text Block]	Three Months Ended March 31, 2021 2020 (Dollars in thousands) Lease income relating to lease payments from operating leases $ 125,746 $ 126,076

Note 3 - Inventories (Tables)

Note 3 - Inventories (Tables)	3 Months Ended
	Mar. 31, 2021
Notes Tables
Schedule of Inventory, Current [Table Text Block]	March 31, December 31, 2021 2020 (Dollars in thousands) Raw materials and purchased parts for assembly $ 14,081 $ 14,835 Self-manufactured assembly parts and finished products 24,327 20,486 Total inventories $ 38,408 $ 35,321

Note 4 - Marketable Securities

Note 4 - Marketable Securities (Tables)	3 Months Ended
	Mar. 31, 2021
Notes Tables
Debt Securities, Available-for-sale [Table Text Block]	March 31, 2021 Amortized cost Gross unrealized gains Gross unrealized losses Fair value (Dollars in thousands) Debt security type: Corporate bonds $ 17,578 $ — $ (12 ) $ 17,653 Commercial paper 7,768 — — 7,768 Money market funds 3,751 — — 3,751 Foreign issuers 2,856 — (8 ) 2,873 Municipal bonds 931 — — 937 Total debt securities available for sale $ 32,884 $ — $ (20 ) $ 32,982
Investments Classified by Contractual Maturity Date [Table Text Block]	March 31, 2021 Less than 12 months Greater than 12 months Fair value Gross unrealized loss Fair value Gross unrealized loss (Dollars in thousands) Debt security type: Corporate bonds $ 17,653 $ (12 ) $ — $ — Commercial paper 7,768 — — — Money market funds 3,751 — — — Foreign issuers 2,873 (8 ) — — Municipal bonds 937 — — — Total debt securities available for sale $ 32,982 $ (20 ) $ — $ —

Note 5 - Fair Value of Financ_2

Note 5 - Fair Value of Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2021
Notes Tables
Fair Value, by Balance Sheet Grouping [Table Text Block]	March 31, 2021 Fair Value Carrying Value at March 31, 2021 Total Level 1 Level 2 Level 3 (Dollars in thousands) Assets: Current assests: Cash equivalents (including restricted cash accounts) $ 39,229 $ 39,229 $ 39,229 $ — $ — Marketable securities (including cash equivalents) 32,884 32,884 32,884 — — Derivatives: Long-term Assets: Cross currency swap (3) 14,419 14,419 — 14,419 — Liabilities: Current liabilities: Derivatives: Swap transaction on RRS prices (4) (14,540 ) (14,540 ) (14,540 ) — — Cross currency swap (3) (2,672 ) (2,672 ) — (2,672 ) — Currency forward contracts (2) (532 ) (532 ) — (532 ) — Long term liabilities: Contingent payables (1) (2,514 ) (2,514 ) — — (2,514 ) $ 66,274 $ 66,274 $ 57,573 $ 11,215 $ (2,514 ) December 31, 2020 Fair Value Carrying Value at December 31, 2020 Total Level 1 Level 2 Level 3 (Dollars in thousands) Assets Current assets: Cash equivalents (including restricted cash accounts) $ 28,653 $ 28,653 $ 28,653 $ — $ — Derivatives: Contingent receivables (1) 111 111 — — 111 Currency forward contracts (2) 1,554 1,554 — 1,554 — Long-term assets: Cross currency swap (3) 27,829 27,829 — 27,829 — Liabilities: Current liabilities: Derivatives: Contingent payables (1) (549 ) (549 ) — — (549 ) Cross currency swap (3) (2,283 ) (2,283 ) — (2,283 ) — Long-term liabilities: Contingent payables (1) (2,630 ) (2,630 ) — — (2,630 ) $ 52,685 $ 52,685 $ 28,653 $ 27,100 $ (3,068 )
Derivative Instruments, Gain (Loss) [Table Text Block]	Amount of recognized gain (loss) Derivatives not designated as hedging instruments Location of recognized gain (loss) Three Months Ended March 31, 2021 2020 Swap transaction on RRS prices (1) Derivative and foreign currency transaction gains (losses) $ (14,540 ) $ — Currency forward contracts (1) Derivative and foreign currency transaction gains (losses) $ 85 $ 1,090 Derivatives designated as cash flow hedging instruments Cross currency swap (2) Derivative and foreign currency transaction gains (losses) $ (11,102 ) $ —
Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss) [Table Text Block]	Balance in Other comprehensive income (loss) beginning of period Gain or (loss) recognized in Other comprehensive income (loss) Amount reclassified from Other comprehensive income (loss) into earnings Balance in Other comprehensive income (loss) end of period Cash flow hedge: Cross currency swap $ 3,366 $ (13,900 ) $ 11,102 $ 568
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]	Fair Value Carrying Amount March 31, 2021 December 31, 2020 March 31, 2021 December 31, 2020 (Dollars in millions) (Dollars in millions) Olkaria III Loan - DFC $ 184.2 $ 192.5 $ 170.2 $ 174.7 Olkaria III plant 4 Loan - DEG 2 40.6 40.4 37.5 37.5 Olkaria III plant 1 Loan - DEG 3 35.8 35.8 32.8 32.8 Platanares Loan - DFC 107.0 112.1 94.2 96.3 Amatitlan Loan 22.6 23.5 21.9 22.8 Senior Secured Notes: OFC 2 LLC ("OFC 2") 197.5 207.9 183.6 188.2 Don A. Campbell 1 ("DAC 1") 74.4 78.5 71.5 73.1 USG Prudential - NV 30.2 31.8 27.4 27.6 USG Prudential - ID 17.4 18.3 17.6 18.4 USG DOE 41.7 45.1 36.8 38.2 Senior Unsecured Bonds 565.8 585.1 518.0 529.1 Senior Unsecured Loan 215.7 222.2 200.0 200.0 Plumstriker 17.8 18.1 17.8 18.1 Other long-term debt 16.2 17.4 16.5 17.6
Fair Value, Liabilities Measured on Recurring and Nonrecurring Basis [Table Text Block]	Level 1 Level 2 Level 3 Total (Dollars in millions) Olkaria III - DFC $ — $ — $ 184.2 $ 184.2 Olkaria III plant 4 Loan - DEG 2 — — 40.6 40.6 Olkaria III plant 1 Loan - DEG 3 — — 35.8 35.8 Platanares Loan - DFC — — 107.0 107.0 Amatitlan Loan — 22.6 — 22.6 Senior Secured Notes: OFC 2 Senior Secured Notes — — 197.5 197.5 DAC 1 Senior Secured Notes — — 74.4 74.4 USG Prudential - NV — — 30.2 30.2 USG Prudential - ID — — 17.4 17.4 USG DOE — — 41.7 41.7 Senior Unsecured Bonds — — 565.8 565.8 Senior Unsecured Loan — — 215.7 215.7 Plumstriker — 17.8 — 17.8 Other long-term debt — — 16.2 16.2 Deposits 15.1 — — 15.1 Level 1 Level 2 Level 3 Total (Dollars in millions) Olkaria III Loan - DFC $ — $ — $ 192.5 $ 192.5 Olkaria IV - DEG 2 — — 40.4 40.4 Olkaria IV - DEG 3 — — 35.8 35.8 Platanares Loan - DFC — — 112.1 112.1 Amatitlan Loan — 23.5 — 23.5 Senior Secured Notes: OFC 2 Senior Secured Notes — — 207.9 207.9 DAC 1 Senior Secured Notes — — 78.5 78.5 USG Prudential - NV — — 31.8 31.8 USG Prudential - ID — — 18.3 18.3 USG DOE — — 45.1 45.1 Senior Unsecured Bonds — — 585.1 585.1 Senior Unsecured Loan — — 222.2 222.2 Plumstriker — 18.1 — 18.1 Other long-term debt — — 17.4 17.4 Deposits 14.8 — — 14.8

Note 7 - Interest Expense, Net

Note 7 - Interest Expense, Net (Tables)	3 Months Ended
	Mar. 31, 2021
Notes Tables
Schedule of Other Nonoperating Expense, by Component [Table Text Block]	Three Months Ended March 31, 2021 2020 (Dollars in thousands) Interest related to sale of tax benefits $ 2,394 $ 2,324 Interest expense 19,674 17,166 Less — amount capitalized (3,052 ) (2,217 ) Total interest expense, net $ 19,016 $ 17,273

Note 8 - Earnings Per Share (Ta

Note 8 - Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2021
Notes Tables
Schedule of Weighted Average Number of Shares [Table Text Block]	Three Months Ended March 31, 2021 2020 Weighted average number of shares used in computation of basic earnings per share: 55,988 51,036 Additional shares from the assumed exercise of employee stock awards 747 490 Weighted average number of shares used in computation of diluted earnings per share 56,735 51,526

Note 9 - Business Segments (Tab

Note 9 - Business Segments (Tables)	3 Months Ended
	Mar. 31, 2021
Notes Tables
Schedule of Segment Reporting Information, by Segment [Table Text Block]	Electricity Product Energy Storage Consolidated (Dollars in thousands) Three Months Ended March 31, 2021: Revenues from external customers: United States (1) $ 98,976 $ 1,853 $ 12,721 $ 113,550 Foreign (2) 46,012 6,790 — 52,802 Net revenue from external customers 144,988 8,643 12,721 166,352 Intersegment revenues (4) — 25,334 — — Operating income (loss) 47,749 (1,211 ) 3,351 49,889 Segment assets at period end (3) (*) 3,577,745 140,039 141,429 3,859,213 * Including unconsolidated investments 104,519 — — 104,519 Three Months Ended March 31, 2020: Revenues from external customers: United States (1) $ 91,692 $ 398 $ 1,846 $ 93,936 Foreign (2) 51,164 47,013 — 98,177 Net revenue from external customers 142,856 47,411 1,846 192,113 Intersegment revenues (4) — 8,656 — — Operating income (loss) 58,630 3,872 (1,445 ) 61,057 Segment assets at period end (3) (*) 3,139,603 230,831 75,179 3,445,613 * Including unconsolidated investments 76,008 — — 76,008
Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block]	Three Months Ended March 31, 2021 2020 (Dollars in thousands) Revenues: Total segment revenues $ 166,352 $ 192,113 Intersegment revenues 25,334 8,656 Elimination of intersegment revenues (25,334 ) (8,656 ) Total consolidated revenues $ 166,352 $ 192,113 Operating income: Operating income $ 49,889 $ 61,057 Interest income 263 402 Interest expense, net (19,016 ) (17,273 ) Derivatives and foreign currency transaction gains (losses) (16,866 ) 393 Income attributable to sale of tax benefits 6,355 4,132 Other non-operating income (expense), net (331 ) 78 Total consolidated income before income taxes and equity in income of investees $ 20,294 $ 48,789

Note 1 - General and Basis of_3

Note 1 - General and Basis of Presentation 1 (Details Textual) $ in Thousands	1 Months Ended		3 Months Ended	12 Months Ended
	Apr. 30, 2021USD ($)	Feb. 28, 2021USD ($)	Mar. 31, 2021USD ($)	Dec. 31, 2020USD ($)
Proceeds from Issuance of Long-term Debt, Total				$ 419,300
Proceeds from Issuance of Common Stock				339,500
Loss from Catastrophes		$ 9,100
Cash, FDIC Insured Amount			$ 29,600	18,900
Cash, Uninsured Amount			75,400	72,400
Accounts Receivable, after Allowance for Credit Loss, Current, Total			139,711	$ 149,170
Product [Member]
Revenue, Remaining Performance Obligation, Amount			$ 37,100
Revenue, Remaining Performance Obligation, Percentage			100.00%
Kenya Power and Lighting Co LTD [Member]
Accounts Receivable, Past Due			$ 47,300
Accounts Receivable, Past Due, Average Number of Days Overdue			76
Kenya Power and Lighting Co LTD [Member] | Subsequent Event [Member]
Proceeds from (Repayments of) Accounts Receivable Securitization, Total	$ 10,700
ENNE [Member]
Accounts Receivable, Past Due			$ 5,500
ENNE [Member] | Subsequent Event [Member]
Proceeds from (Repayments of) Accounts Receivable Securitization, Total	$ 2,400
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Primary Customers [Member]
Concentration Risk, Percentage			67.00%	65.00%
Non-US [Member]
Accounts Receivable, after Allowance for Credit Loss, Current, Total			$ 102,800	$ 111,300
General and Administrative Expense [Member]
Accounts Receivable, Credit Loss Expense (Reversal)			$ 3,000

Note 1 - General and Basis of_4

Note 1 - General and Basis of Presentation 2 (Details Textual)	Mar. 31, 2021
Product [Member] | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-04-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period (Year)	24 years

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	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Cash and cash equivalents	$ 376,630	$ 448,252	$ 231,149
Restricted cash and cash equivalents	88,449	88,526	88,627
Total Cash and cash equivalents and restricted cash and cash equivalents	$ 465,079	$ 536,778	$ 319,776	$ 153,110

Note 1 - General and Basis of_6

Note 1 - General and Basis of Presentation - Customers as a Percentage of Total Revenues (Details) - Revenue Benchmark [Member] - Customer Concentration Risk [Member]	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Sierra Pacific Power Company And Nevada Power Company [Member]
Percent of revenues	21.40%	19.20%
Southern California Public Power Authority [Member]
Percent of revenues	24.90%	18.70%
Kenya Power and Lighting Co LTD [Member]
Percent of revenues	15.60%	15.40%

Note 1 - General and Basis of_7

Note 1 - General and Basis of Presentation - Changes in the Allowance for Expected Credit Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Beginning balance of the allowance for expected credit losses	$ 597
Ending balance of the allowance for expected credit losses	597
Accounting Standards Update 2016-13 [Member]
Beginning balance of the allowance for expected credit losses	597	$ 755
Change in the provision for expected credit losses for the period	0	24
Ending balance of the allowance for expected credit losses	$ 597	$ 779

Note 1 - General and Basis of_8

Note 1 - General and Basis of Presentation - Contract Assets (Liabilities) (Details) - USD ($) $ in Thousands		Mar. 31, 2021	Dec. 31, 2020
Contract assets (*)	[1]	$ 20,876	$ 24,544
Contract liabilities (*)	[1]	$ (12,686)	$ (11,179)
[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 not yet recognized as product revenues during the three months ended March 31, 2021 as a result of performance obligations having been satisfied.

Note 1 - General and Basis of_9

Note 1 - General and Basis of Presentation - Lease Income as Lessor (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Lease income relating to lease payments from operating leases	$ 125,746	$ 126,076

Note 3 - Inventories - Inventor

Note 3 - Inventories - Inventories, Current (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Raw materials and purchased parts for assembly	$ 14,081	$ 14,835
Self-manufactured assembly parts and finished products	24,327	20,486
Total inventories	$ 38,408	$ 35,321

Note 4 - Marketable Securitie_2

Note 4 - Marketable Securities (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Debt Securities, Available-for-sale, Total	$ 27,735		$ 0
Proceeds from Sale of Debt Securities, Available-for-sale	0	$ 0
Cash and Cash Equivalents [Member]
Debt Securities, Available-for-sale, Total	$ 5,200

Note 4 - Marketable Securitie_3

Note 4 - Marketable Securities - Investment in Marketable Securities (Details) $ in Thousands	Mar. 31, 2021USD ($)
Amortized cost	$ 32,884
Gross unrealized gains	0
Gross unrealized losses	(20)
Fair value	32,982
Corporate Debt Securities [Member]
Amortized cost	17,578
Gross unrealized gains	0
Gross unrealized losses	(12)
Fair value	17,653
Commercial Paper [Member]
Amortized cost	7,768
Gross unrealized gains	0
Gross unrealized losses	0
Fair value	7,768
Money Market Funds [Member]
Amortized cost	3,751
Gross unrealized gains	0
Gross unrealized losses	0
Fair value	3,751
Debt Security, Corporate, Non-US [Member]
Amortized cost	2,856
Gross unrealized gains	0
Gross unrealized losses	(8)
Fair value	2,873
Municipal Bonds [Member]
Amortized cost	931
Gross unrealized gains	0
Gross unrealized losses	0
Fair value	$ 937

Note 4 - Marketable Securitie_4

Note 4 - Marketable Securities - Fair Value and Gross Unrealized Losses (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Fair value	$ 27,735	$ 0
Gross unrealized losses	(20)
Maturity, Less Than 12 Months [Member]
Fair value	32,982
Gross unrealized losses	(20)
Maturity, Greater Than 12 Months [Member]
Fair value	0
Gross unrealized losses	0
Corporate Debt Securities [Member]
Gross unrealized losses	(12)
Corporate Debt Securities [Member] | Maturity, Less Than 12 Months [Member]
Fair value	17,653
Gross unrealized losses	(12)
Corporate Debt Securities [Member] | Maturity, Greater Than 12 Months [Member]
Fair value	0
Gross unrealized losses	0
Commercial Paper [Member]
Gross unrealized losses	0
Commercial Paper [Member] | Maturity, Less Than 12 Months [Member]
Fair value	7,768
Gross unrealized losses	0
Commercial Paper [Member] | Maturity, Greater Than 12 Months [Member]
Fair value	0
Gross unrealized losses	0
Money Market Funds [Member]
Gross unrealized losses	0
Money Market Funds [Member] | Maturity, Less Than 12 Months [Member]
Fair value	3,751
Gross unrealized losses	0
Money Market Funds [Member] | Maturity, Greater Than 12 Months [Member]
Fair value	0
Gross unrealized losses	0
Debt Security, Corporate, Non-US [Member]
Gross unrealized losses	(8)
Debt Security, Corporate, Non-US [Member] | Maturity, Less Than 12 Months [Member]
Fair value	2,873
Gross unrealized losses	(8)
Debt Security, Corporate, Non-US [Member] | Maturity, Greater Than 12 Months [Member]
Fair value	0
Gross unrealized losses	0
Municipal Bonds [Member]
Gross unrealized losses	0
Municipal Bonds [Member] | Maturity, Less Than 12 Months [Member]
Fair value	937
Gross unrealized losses	0
Municipal Bonds [Member] | Maturity, Greater Than 12 Months [Member]
Fair value	0
Gross unrealized losses	$ 0

Note 5 - Fair Value of Financ_3

Note 5 - Fair Value of Financial Instruments (Details Textual) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Cross Currency Interest Rate Contract [Member] | Deposits and Other and Accounts Payable and Accrued Expenses [Member]
Derivatives, Cash Collateral Deposits	$ 0	$ 0

Note 5 - Fair Value of Financ_4

Note 5 - Fair Value of Financial Instruments - Financial Assets and Liabilities at Fair Value (Details) - USD ($)		Mar. 31, 2021		Dec. 31, 2020
Debt Securities, Available-for-sale, Total		$ 27,735,000		$ 0
Reported Value Measurement [Member]
Cash equivalents (including restricted cash accounts)		39,229,000		28,653,000
Debt Securities, Available-for-sale, Total		32,884
Fair Value, Net Asset (Liability), Total		66,274,000		52,685,000
Reported Value Measurement [Member] | Contingent Receivable [Member]
Derivative Asset, Current				111,000
Reported Value Measurement [Member] | Currency Forward Contracts [Member]
Derivatives, current	[1]	(532,000)
Derivative Asset, Current	[2]			1,554,000
Reported Value Measurement [Member] | Cross Currency Interest Rate Contract [Member]
Derivative Asset, Noncurrent	[3]	14,419,000		27,829,000
Derivatives, current		(2,672,000)	[1]	(2,283,000)	[2]
Reported Value Measurement [Member] | Swap Transaction on RRS Prices [Member]
Derivatives, current	[4]	(14,540)
Reported Value Measurement [Member] | Contingent Payable [Member]
Derivatives, current	[5]			(549,000)
Derivatives, noncurrent	[5]	(2,514,000)		(2,630,000)
Estimate of Fair Value Measurement [Member]
Cash equivalents (including restricted cash accounts)		39,229,000		28,653,000
Debt Securities, Available-for-sale, Total		32,884
Fair Value, Net Asset (Liability), Total		66,274,000		52,685,000
Estimate of Fair Value Measurement [Member] | Contingent Receivable [Member]
Derivative Asset, Current				111,000
Estimate of Fair Value Measurement [Member] | Currency Forward Contracts [Member]
Derivatives, current	[1]	(532,000)
Derivative Asset, Current	[2]			1,554,000
Estimate of Fair Value Measurement [Member] | Cross Currency Interest Rate Contract [Member]
Derivative Asset, Noncurrent	[3]	14,419,000		27,829,000
Derivatives, current		(2,672,000)	[1]	(2,283,000)	[2]
Estimate of Fair Value Measurement [Member] | Swap Transaction on RRS Prices [Member]
Derivatives, current	[4]	(14,540)
Estimate of Fair Value Measurement [Member] | Contingent Payable [Member]
Derivatives, current	[5]			(549,000)
Derivatives, noncurrent	[5]	(2,514,000)		(2,630,000)
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Cash equivalents (including restricted cash accounts)		39,229,000		28,653,000
Debt Securities, Available-for-sale, Total		32,884
Fair Value, Net Asset (Liability), Total		57,573,000		28,653,000
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Contingent Receivable [Member]
Derivative Asset, Current				0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Currency Forward Contracts [Member]
Derivatives, current	[1]	0
Derivative Asset, Current	[2]			0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Cross Currency Interest Rate Contract [Member]
Derivative Asset, Noncurrent	[3]	0		0
Derivatives, current		0	[1]	0	[2]
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Swap Transaction on RRS Prices [Member]
Derivatives, current	[4]	(14,540)
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Contingent Payable [Member]
Derivatives, current	[5]			0
Derivatives, noncurrent	[5]	0		0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Cash equivalents (including restricted cash accounts)		0		0
Debt Securities, Available-for-sale, Total		0
Fair Value, Net Asset (Liability), Total		11,215,000		27,100,000
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Contingent Receivable [Member]
Derivative Asset, Current				0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Currency Forward Contracts [Member]
Derivatives, current	[1]	(532,000)
Derivative Asset, Current	[2]			1,554,000
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Cross Currency Interest Rate Contract [Member]
Derivative Asset, Noncurrent	[3]	14,419,000		27,829,000
Derivatives, current		(2,672,000)	[1]	(2,283,000)	[2]
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Swap Transaction on RRS Prices [Member]
Derivatives, current	[4]	0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Contingent Payable [Member]
Derivatives, current	[5]			0
Derivatives, noncurrent	[5]	0		0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Cash equivalents (including restricted cash accounts)		0		0
Debt Securities, Available-for-sale, Total		0
Fair Value, Net Asset (Liability), Total		(2,514,000)		(3,068,000)
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Contingent Receivable [Member]
Derivative Asset, Current				111,000
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Currency Forward Contracts [Member]
Derivatives, current	[1]	0
Derivative Asset, Current	[2]			0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Cross Currency Interest Rate Contract [Member]
Derivative Asset, Noncurrent	[3]	0		0
Derivatives, current		0	[1]	0	[2]
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Swap Transaction on RRS Prices [Member]
Derivatives, current	[4]	0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Contingent Payable [Member]
Derivatives, current	[5]			(549,000)
Derivatives, noncurrent	[5]	$ (2,514,000)		$ (2,630,000)
[1]	These amounts relate to currency forward contracts valued primarily based on observable inputs, including forward and spot prices for currencies, net of contracted rates and then multiplied by notional amounts, and are included within “Receivables, other” and “Accounts payable and accrued expenses”, as applicable, on March 31, 2021 and December 31, 2020, in the condensed 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 “Receivables, other” and “Accounts payable and accrued expenses”, as applicable, on March 31, 2021 and December 31, 2020, in the condensed 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.
[3]	These amounts relate to cross currency swap contracts valued primarily based on the present value of the cross currency swap future settlement prices for USD and NIS zero yield curves and the applicable exchange rate as of March 31, 2021 and December 31, 2020, as applicable. These amounts are included within “Deposits and other” and "Accounts payable and accrued expenses", as applicable, on March 31, 2021 and December 31, 2020 in the condensed consolidated balance sheets. There are no cash collateral deposits on March 31, 2021 and December 31, 2020.
[4]	This amount relates to a price swap contract valued primarily based on observable inputs, including market prices per MWH multiplied by notional amounts, and is included within “Accounts payable and accrued expenses” on March 31, 2021 in the condensed 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.
[5]	These amounts relate to contingent receivables and payables and warrants pertaining to the Guadeloupe power plant purchase transaction, valued primarily based on unobservable inputs and are included within “Prepaid expenses and other”, “Accounts payable and accrued expenses” and “Other long-term liabilities” on March 31, 2021 and December 31, 2020, as applicable, in the condensed 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.

Note 5 - Fair Value of Financ_5

Note 5 - Fair Value of Financial Instruments - Amounts of Gain (Loss) Recognized in Condensed Consolidated Statements on Derivative Instruments Not Designated as Hedges (Details) - Foreign Currency Gain (Loss) [Member] - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2021	Mar. 30, 2020
Swap Transaction on RRS Prices [Member]
Amount of gain (loss) recognized		$ (14,540)	$ 0
Currency Forward Contracts [Member]
Amount of gain (loss) recognized	[1]	85	1,090
Cross Currency Interest Rate Contract [Member]
Amount of gain (loss) recognized	[2]	$ (11,102)	$ 0
[1]	The foregoing currency forward and price swap transactions were not designated as hedge transactions and are marked to market with the corresponding gains or losses recognized within “Derivatives and foreign currency transaction gains (losses)” in the condensed consolidated statements of operations and comprehensive income. The price swap transaction relates to a hedging agreement with a third party that was effective January 1, 2021 under which the Company fixed the price per MWH on a portion of RRS provided by its Rabbit Hill storage facility, as described under Note 1 to the condensed consolidated financial statements. The price swap transaction was terminated effective April 1, 2021.
[2]	The foregoing cross currency swap transactions were designated as a cash flow hedge as further described under note 1 to the condensed consolidated financial statements. The changes in the cross currency swap fair value are initially recorded in "Other comprehensive income (loss)" and a corresponding amount is reclassified out of "Accumulated other comprehensive income (loss)" to "Derivatives and foreign currency transaction gains (losses)" to offset the remeasurement of the underlying hedged transaction which also impacts the same line item in the condensed consolidated statements of operations and comprehensive income.

Note 5 - Fair Value of Financ_6

Note 5 - Fair Value of Financial Instruments - Derivative Instruments in Other Comprehensive Income (Loss) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021USD ($)
Balance in Other comprehensive income (loss) beginning of period	$ 1,941,437
Balance in Other comprehensive income (loss) end of period	1,949,879
Cross Currency Interest Rate Contract [Member] | Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest [Member]
Balance in Other comprehensive income (loss) beginning of period	3,366
Gain or (loss) recognized in Other comprehensive income (loss)	(13,900)	[1]
Amount reclassified from Other comprehensive income (loss) into earnings	11,102
Balance in Other comprehensive income (loss) end of period	$ 568
[1]	The amount of gain or (loss) recognized in Other comprehensive income (loss) is net of tax of $1.1 million.

Note 5 - Fair Value of Financ_7

Note 5 - Fair Value of Financial Instruments - Fair Value of Long-term Debt Approximates Its Carrying Amount, Exceptions (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Olkaria III OPIC [Member]
Loans	$ 184.2	$ 192.5
Olkaria III Plant 4 Loan - DEG 2 [Member]
Loans	40.6
Olkaria III plant 1 Loan - DEG 3 [Member]
Loans	35.8
Platanares Loan - OPIC [Member]
Loans	107	112.1
Amatitlan Loan [Member]
Loans	22.6	23.5
Don A. Campbell 1 ("DAC1") [Member]
Notes	74.4	78.5
USG Prudential - NV [Member]
Notes	30.2	31.8
USG Prudential - ID [Member]
Notes	17.4	18.3
USG DOE [Member]
Notes	41.7	45.1
Senior Unsecured Bonds [Member]
Senior Unsecured debt	565.8	585.1
Senior Unsecured Loan [Member]
Senior Unsecured debt	215.7	222.2
Plumstriker Loan Agreement [Member]
Loans	17.8	18.1
Estimate of Fair Value Measurement [Member]
Other long-term debt	16.2	17.4
Estimate of Fair Value Measurement [Member] | Olkaria III OPIC [Member]
Loans	184.2	192.5
Estimate of Fair Value Measurement [Member] | Olkaria III Plant 4 Loan - DEG 2 [Member]
Loans	40.6	40.4
Estimate of Fair Value Measurement [Member] | Olkaria III plant 1 Loan - DEG 3 [Member]
Loans	35.8	35.8
Estimate of Fair Value Measurement [Member] | Platanares Loan - OPIC [Member]
Loans	107	112.1
Estimate of Fair Value Measurement [Member] | Amatitlan Loan [Member]
Loans	22.6	23.5
Estimate of Fair Value Measurement [Member] | OFC Two Senior Secured Notes [Member]
Notes	197.5	207.9
Estimate of Fair Value Measurement [Member] | Don A. Campbell 1 ("DAC1") [Member]
Notes	74.4	78.5
Estimate of Fair Value Measurement [Member] | USG Prudential - NV [Member]
Notes	30.2	31.8
Estimate of Fair Value Measurement [Member] | USG Prudential - ID [Member]
Notes	17.4	18.3
Estimate of Fair Value Measurement [Member] | USG DOE [Member]
Notes	41.7	45.1
Estimate of Fair Value Measurement [Member] | Senior Unsecured Bonds [Member]
Senior Unsecured debt	565.8	585.1
Estimate of Fair Value Measurement [Member] | Senior Unsecured Loan [Member]
Senior Unsecured debt	215.7	222.2
Estimate of Fair Value Measurement [Member] | Plumstriker Loan Agreement [Member]
Loans	17.8	18.1
Reported Value Measurement [Member]
Other long-term debt	16.5	17.6
Reported Value Measurement [Member] | Olkaria III OPIC [Member]
Loans	170.2	174.7
Reported Value Measurement [Member] | Olkaria III Plant 4 Loan - DEG 2 [Member]
Loans	37.5	37.5
Reported Value Measurement [Member] | Olkaria III plant 1 Loan - DEG 3 [Member]
Loans	32.8	32.8
Reported Value Measurement [Member] | Platanares Loan - OPIC [Member]
Loans	94.2	96.3
Reported Value Measurement [Member] | Amatitlan Loan [Member]
Loans	21.9	22.8
Reported Value Measurement [Member] | OFC Two Senior Secured Notes [Member]
Notes	183.6	188.2
Reported Value Measurement [Member] | Don A. Campbell 1 ("DAC1") [Member]
Notes	71.5	73.1
Reported Value Measurement [Member] | USG Prudential - NV [Member]
Notes	27.4	27.6
Reported Value Measurement [Member] | USG Prudential - ID [Member]
Notes	17.6	18.4
Reported Value Measurement [Member] | USG DOE [Member]
Notes	36.8	38.2
Reported Value Measurement [Member] | Senior Unsecured Bonds [Member]
Senior Unsecured debt	518	529.1
Reported Value Measurement [Member] | Senior Unsecured Loan [Member]
Senior Unsecured debt	200	200
Reported Value Measurement [Member] | Plumstriker Loan Agreement [Member]
Loans	$ 17.8	$ 18.1

Note 5 - Fair Value of Financ_8

Note 5 - Fair Value of Financial Instruments - Fair Value of Financial Instruments (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Deposits	$ 15.1	$ 14.8
Olkaria III OPIC [Member]
Loans	184.2	192.5
Olkaria III Plant 4 Loan - DEG 2 [Member]
Loans	40.6
Olkaria IV Loan - DEG 2 [Member]
Loans		40.4
Olkaria III plant 1 Loan - DEG 3 [Member]
Loans	35.8
Olkaria IV Loan - DEG 3 [Member]
Loans		35.8
Platanares Loan - OPIC [Member]
Loans	107	112.1
Amatitlan Loan [Member]
Loans	22.6	23.5
OFC Senior Secured Notes [Member]
Notes	197.5	207.9
Don A. Campbell 1 ("DAC1") [Member]
Notes	74.4	78.5
USG Prudential - NV [Member]
Notes	30.2	31.8
USG Prudential - ID [Member]
Notes	17.4	18.3
USG DOE [Member]
Notes	41.7	45.1
Senior Unsecured Bonds [Member]
Senior Unsecured debt	565.8	585.1
Senior Unsecured Loan [Member]
Senior Unsecured debt	215.7	222.2
Plumstriker Loan Agreement [Member]
Loans	17.8	18.1
Other Long-term Debt [Member]
Senior Unsecured debt	16.2	17.4
Fair Value, Inputs, Level 1 [Member]
Deposits	15.1	14.8
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
Fair Value, Inputs, Level 1 [Member] | Olkaria IV Loan - DEG 2 [Member]
Loans		0
Fair Value, Inputs, Level 1 [Member] | Olkaria III plant 1 Loan - DEG 3 [Member]
Loans	0
Fair Value, Inputs, Level 1 [Member] | Olkaria IV Loan - DEG 3 [Member]
Loans		0
Fair Value, Inputs, Level 1 [Member] | Platanares Loan - OPIC [Member]
Loans	0	0
Fair Value, Inputs, Level 1 [Member] | Amatitlan Loan [Member]
Loans	0	0
Fair Value, Inputs, Level 1 [Member] | 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	0
Fair Value, Inputs, Level 1 [Member] | Other Long-term Debt [Member]
Senior Unsecured debt	0	0
Fair Value, Inputs, Level 2 [Member]
Deposits	0	0
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
Fair Value, Inputs, Level 2 [Member] | Olkaria IV Loan - DEG 2 [Member]
Loans		0
Fair Value, Inputs, Level 2 [Member] | Olkaria III plant 1 Loan - DEG 3 [Member]
Loans	0
Fair Value, Inputs, Level 2 [Member] | Olkaria IV Loan - DEG 3 [Member]
Loans		0
Fair Value, Inputs, Level 2 [Member] | Platanares Loan - OPIC [Member]
Loans	0	0
Fair Value, Inputs, Level 2 [Member] | Amatitlan Loan [Member]
Loans	22.6	23.5
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	17.8	18.1
Fair Value, Inputs, Level 2 [Member] | Other Long-term Debt [Member]
Senior Unsecured debt	0	0
Fair Value, Inputs, Level 3 [Member]
Deposits	0	0
Fair Value, Inputs, Level 3 [Member] | Olkaria III OPIC [Member]
Loans	184.2	192.5
Fair Value, Inputs, Level 3 [Member] | Olkaria III Plant 4 Loan - DEG 2 [Member]
Loans	40.6
Fair Value, Inputs, Level 3 [Member] | Olkaria IV Loan - DEG 2 [Member]
Loans		40.4
Fair Value, Inputs, Level 3 [Member] | Olkaria III plant 1 Loan - DEG 3 [Member]
Loans	35.8
Fair Value, Inputs, Level 3 [Member] | Olkaria IV Loan - DEG 3 [Member]
Loans		35.8
Fair Value, Inputs, Level 3 [Member] | Platanares Loan - OPIC [Member]
Loans	107	112.1
Fair Value, Inputs, Level 3 [Member] | Amatitlan Loan [Member]
Loans	0	0
Fair Value, Inputs, Level 3 [Member] | OFC Senior Secured Notes [Member]
Notes	197.5	207.9
Fair Value, Inputs, Level 3 [Member] | Don A. Campbell 1 ("DAC1") [Member]
Notes	74.4	78.5
Fair Value, Inputs, Level 3 [Member] | USG Prudential - NV [Member]
Notes	30.2	31.8
Fair Value, Inputs, Level 3 [Member] | USG Prudential - ID [Member]
Notes	17.4	18.3
Fair Value, Inputs, Level 3 [Member] | USG DOE [Member]
Notes	41.7	45.1
Fair Value, Inputs, Level 3 [Member] | Senior Unsecured Bonds [Member]
Senior Unsecured debt	565.8	585.1
Fair Value, Inputs, Level 3 [Member] | Senior Unsecured Loan [Member]
Senior Unsecured debt	215.7	222.2
Fair Value, Inputs, Level 3 [Member] | Plumstriker Loan Agreement [Member]
Loans	0	0
Fair Value, Inputs, Level 3 [Member] | Other Long-term Debt [Member]
Senior Unsecured debt	$ 16.2	$ 17.4

Note 7 - Interest Expense, Ne_2

Note 7 - Interest Expense, Net - Components of Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Interest related to sale of tax benefits	$ 2,394	$ 2,324
Interest expense	19,674	17,166
Less — amount capitalized	(3,052)	(2,217)
Total interest expense, net	$ 19,016	$ 17,273

Note 8 - Earnings Per Share (De

Note 8 - Earnings Per Share (Details Textual) - shares	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares)	13,900	4,500

Note 8 - Earnings Per Share - S

Note 8 - Earnings Per Share - Shares Used to Calculate Earnings Per Share (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Weighted average number of shares used in computation of basic earnings per share: (in shares)	55,988	51,036
Additional shares from the assumed exercise of employee stock awards (in shares)	747	490
Weighted average number of shares used in computation of diluted earnings per share (in shares)	56,735	51,526

Note 9 - Business Segments (Det

Note 9 - Business Segments (Details Textual) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021USD ($)	Mar. 31, 2020USD ($)	Dec. 31, 2020USD ($)
Number of Reportable Segments			3
Revenue from Contract with Customer, Including Assessed Tax	$ 166,352	$ 192,113
Goodwill, Ending Balance	24,237		$ 24,566
Electricity Segment [Member]
Revenue from Contract with Customer, Including Assessed Tax	144,988	142,856
Goodwill, Ending Balance	20,100	20,000
Electricity Segment [Member] | Accounting Standards Update 2014-09 [Member]
Revenue from Contract with Customer, Including Assessed Tax	19,200	16,800
Energy Storage and Management Services [Member]
Goodwill, Ending Balance	4,100	0
Product Segment [Member]
Revenue from Contract with Customer, Including Assessed Tax	8,643	47,411
Goodwill, Ending Balance	$ 0	$ 0

Note 9 - Business Segments - Su

Note 9 - Business Segments - Summarized Financial Information Concerning Reportable Segments (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2021		Mar. 31, 2020		Dec. 31, 2020
Revenues		$ 166,352		$ 192,113
Operating income (loss)		49,889		61,057
Segment assets at period end		3,859,213	[1],[2]	3,445,613	[1],[2]	$ 3,888,987
Segment Reconciling Items [Member]
Revenues	[3]	0		0
Segment assets at period end		104,519		76,008
Electricity Segment [Member]
Revenues		144,988		142,856
Operating income (loss)		47,749		58,630
Segment assets at period end	[1],[2]	3,577,745		3,139,603
Electricity Segment [Member] | Segment Reconciling Items [Member]
Revenues	[3]	0		0
Segment assets at period end		104,519		76,008
Product Segment [Member]
Revenues		8,643		47,411
Operating income (loss)		(1,211)		3,872
Segment assets at period end	[1],[2]	140,039		230,831
Product Segment [Member] | Segment Reconciling Items [Member]
Revenues	[3]	25,334		8,656
Segment assets at period end		0		0
Other Segments [Member]
Revenues		12,721		1,846
Operating income (loss)		3,351		(1,445)
Segment assets at period end	[1],[2]	141,429		75,179
Other Segments [Member] | Segment Reconciling Items [Member]
Revenues	[3]	0		0
Segment assets at period end		0		0
UNITED STATES
Revenues	[4]	113,550		93,936
UNITED STATES | Electricity Segment [Member]
Revenues	[4]	98,976		91,692
UNITED STATES | Product Segment [Member]
Revenues	[4]	1,853		398
UNITED STATES | Other Segments [Member]
Revenues	[4]	12,721		1,846
Non-US [Member]
Revenues	[5]	52,802		98,177
Non-US [Member] | Electricity Segment [Member]
Revenues	[5]	46,012		51,164
Non-US [Member] | Product Segment [Member]
Revenues	[5]	6,790		47,013
Non-US [Member] | Other Segments [Member]
Revenues	[5]	$ 0		$ 0
[1]	Electricity segment assets include goodwill in the amount of $20.1 million and $20.0 million as of March 31, 2021 and 2020, respectively. Energy Storage segment assets include goodwill in the amount of $4.1 million and none as of March 31, 2021 and 2020, respectively. No goodwill is included in the Product segment assets as of March 31, 2021 and 2020.
[2]	Including unconsolidated investments
[3]	Intersegment revenue are fully eliminated in consolidation.
[4]	Electricity segment revenues in the United States are all accounted under lease accounting except for $19.2 million and $16.8 million in the three months ended March 31, 2021 and 2020, respectively, that are accounted under ASC 606. Product and Energy Storage 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 9 - Business Segments - Re

Note 9 - Business Segments - Reconciling Information Between Reportable Segments and Consolidated Totals (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenue	$ 166,352	$ 192,113
Operating income (loss)	49,889	61,057
Interest income	263	402
Interest expense, net	(19,016)	(17,273)
Derivatives and foreign currency transaction gains (losses)	(16,866)	393
Income attributable to sale of tax benefits	6,355	4,132
Other non-operating income (expense), net	(331)	78
Total consolidated income before income taxes and equity in income of investees	20,294	48,789
Intersegment Eliminations [Member]
Revenue	25,334	8,656
Consolidation, Eliminations [Member]
Revenue	$ (25,334)	$ (8,656)

Note 10 - Commitments and Con_2

Note 10 - Commitments and Contingencies (Details Textual) - USD ($) $ in Millions	Mar. 03, 2021	Mar. 29, 2016
Former Local Sales Representative vs. Ormat [Member] | Pending Litigation [Member]
Loss Contingency, Damages Sought, Value		$ 4.6
Loss Contingency, Additional Damages Sought for Ormat Geothermal Products Sales in Chile, Percent		3.75%
Loss Contingency, Damages Sought, Ormat Geothermal Products Sales in Chile, Period (Year)		10 years
Avishai Shmuel Mano vs. Ormat [Member]
Loss Contingency, Damages Sought, Value	$ 100

Note 11 - Income Taxes (Details

Note 11 - Income Taxes (Details Textual)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Effective Income Tax Rate Reconciliation, Percent, Total	14.80%	37.20%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%

Note 12 - Subsequent Events (De

Note 12 - Subsequent Events (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	May 05, 2021	Mar. 31, 2021	Mar. 31, 2020
Dividends, Common Stock, Total		$ 6,718	$ 5,614
Subsequent Event [Member]
Dividends, Common Stock, Total	$ 6,700
Common Stock, Dividends, Per Share, Declared (in dollars per share)	$ 0.12
Dividends Payable, Date of Record	May 18, 2021
Dividends Payable, Date to be Paid	Jun. 1, 2021