Ormat (ORA) 10-Q/A 19 Jun 18 2017 Q3 Quarterly report (amended) Financial data

Document And Entity Information

Document And Entity Information - shares	9 Months Ended
	Sep. 30, 2017	Nov. 05, 2017
Document Information [Line Items]
Entity Registrant Name	ORMAT TECHNOLOGIES, INC.
Entity Central Index Key	1,296,445
Trading Symbol	ora
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Entity Common Stock, Shares Outstanding (in shares)		50,597,124
Document Type	10-Q/A
Document Period End Date	Sep. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q3
Amendment Flag	true
Amendment Description	This Amendment No. 1 to Form 10-Q (this "Amendment") amends the Quarterly Report on Form 10-Q for the three and nine months ended September 30, 2017 originally filed with the Securities and Exchange Commission ("SEC") on November 9, 2017 (the "Original Filing") by Ormat Technologies, Inc. (the Company). Restatement As further discussed in Note 1 to our unaudited condensed consolidated financial statements in Part I, Item 1, "Financial Statements" of this Amendment, on May 16, 2018, we concluded that we should restate our previously issued consolidated financial statements as of and for the year ended December 31, 2017 to correct for (i) errors in our income tax provision primarily related to the Company's ability to utilize Federal tax credits in the United States ("U.S.") prior to their expiration and the resulting impact on the Company's deferred tax asset valuation allowance, and (ii) the inappropriate netting of certain deferred income tax assets and deferred income tax liabilities across different tax jurisdictions that was not permissible under U.S. generally accepted accounting principles ("GAAP"). In addition, we also concluded that we would revise our previously issued consolidated financial statements as of and for the year ended December 31, 2016 and for the year ended December 31, 2015 to correct for errors in our income tax provision primarily related to the translation of deferred tax liabilities in a foreign subsidiary. The restatement, for 2017, and revision, for 2016, is being effected through the Company's filing of an amendment on Form 10-K/A for the year ended December 31, 2017. In connection with these restatements and revisions, the Company also recorded adjustments to correct other immaterial tax errors. This decision to restate and revise our previously issued financial statements was approved by, and with the continuing oversight of, the Company's Board of Directors upon the recommendation of its Audit Committee. These error corrections also resulted in the restatement, for 2017, and revision, for 2016, of the Company's previously issued unaudited condensed consolidated financial statements for the three and six months ended June 30, 2017 and 2016, respectively, which has been effected through the Company’s filing of an amendment on Form 10-Q/A for the quarter ended June 30, 2017, and the three and nine months ended September 30, 2017 and 2016, respectively, which is being effected through the Company's filing of this Amendment. The revision of the Company's previously issued unaudited condensed consolidated financial statements for the quarter ended March 31, 2017 will be affected in connection with the Company's filing of its Form 10-Q for the quarter ended March 31, 2018. Internal Control Over Financial Reporting Management, under the supervision and participation of our Chief Executive Officer and our Chief Financial Officer, has conducted an evaluation of the effectiveness of our internal control over financial reporting as of December 31, 2017 using criteria established in Internal Control — Integrated Framework (2013) issued by the COSO and, based on this evaluation, concluded that our internal control over financial reporting was not effective as of December 31, 2017 as a result of the material weakness in our internal control over financial reporting. For a description of the material weakness in internal control over financial reporting and for an amended evaluation of disclosure controls and procedures, see Part I, Item 4. "Controls and Procedures" of this Amendment. Amendment Accordingly, the purpose of this Amendment is to (i) restate the Company's previously issued unaudited condensed consolidated financial statements and related disclosures as of and for the three and nine-months ended September 30, 2017; and (ii) revise the Company’s unaudited condensed consolidated financial statements for the three and nine-months ended September 30, 2016; and (iii) revise the Company’s condensed consolidated balance sheet as of December 31, 2016, which was derived from the audited consolidated financial statements, which have been revised as described above, but does not include all disclosures required by GAAP, all contained in Part I, Item 1. "Financial Statements" of this Amendment. This Amendment also includes (a) an amended Part I, Item 2. "Management's Discussion and Analysis of Financial Condition and Results of Operations" to reflect the correction of the errors described above, and (b) an amended Part I, Item 4. "Controls and Procedures" to restate the conclusion on the effectiveness of disclosure controls and procedures. Disclosure controls and procedures were deemed effective in the Original Filing on November 9, 2017 and are deemed ineffective as a result of the material weakness described in Part I, Item 4. "Controls and Procedures" of this Amendment. Except as expressly set forth herein, this Amendment does not reflect events occurring after the date of the Original Filing or modify or update any of the other disclosures contained therein in any way other than as required to reflect the amendment discussed above. Accordingly, this Amendment should be read in conjunction with the Original Filing and our other filings with the SEC. Items Amended in this Filing For reasons discussed above, we are filing this Amendment in order to amend the following items in our Original Report to the extent necessary to reflect the adjustments discussed above and make corresponding revisions to our financial data cited elsewhere in this Amendment: Part I, Item 1. Financial Statements Part I, Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations Part I, Item 4. Controls and Procedures In accordance with applicable SEC rules, this Amendment includes new certifications required by Rule 13a-14 under the Securities Exchange Act of 1934 from our Chief Executive Officer and Chief Financial Officer dated as of the date of filing of this Amendment.

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2017		Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 77,212		$ 230,214
Restricted cash and cash equivalents (primarily related to VIEs)	42,559		34,262
Receivables:
Trade	98,384		80,807
Other	11,591		17,482
Inventories	18,685		12,000
Costs and estimated earnings in excess of billings on uncompleted contracts	42,087		52,198
Prepaid expenses and other	41,727		45,867
Total current assets	332,245		472,830
Investment in an unconsolidated company	25,367
Deposits and other	17,371		18,553
Deferred charges	43,972		43,773
Property, plant and equipment, net ($1,518,962 and $1,483,224 related to VIEs, respectively)	1,621,012		1,556,378
Construction-in-process ($105,848 and $120,853 related to VIEs, respectively)	350,872		306,709
Deferred financing and lease costs, net	5,426		3,923
Intangible assets, net	86,806		52,753
Goodwill	20,667		6,650
Total assets	2,503,738	[1]	2,461,569
Current liabilities:
Accounts payable and accrued expenses	103,335		91,650
Short term revolving credit lines with banks (full recourse)	33,900
Billings in excess of costs and estimated earnings on uncompleted contracts	6,015		31,630
Current portion of long-term debt:
Senior secured notes	27,847		32,234
Other loans	21,495		21,495
Full recourse	864		12,242
Total current liabilities	193,456		189,251
Long-term debt, net of current portion:
Senior secured notes (less deferred financing costs of $8,202 and $9,177, respectively)	322,299		350,388
Other loans (less deferred financing costs of $5,496 and $6,409, respectively)	247,401		261,845
Senior unsecured bonds (less deferred financing costs of $617 and $755, respectively)	203,715		203,577
Other loans (less deferred financing costs of $1,043 and $1,346, respectively)	48,957		57,063
Investment in an unconsolidated company			11,081
Liability associated with sale of tax benefits	46,803		54,662
Deferred lease income	52,273		54,561
Deferred income tax liabilities	77,914		36,411
Liability for unrecognized tax benefits	6,188		6,444
Liabilities for severance pay	20,364		18,600
Asset retirement obligation	24,740		23,348
Other long-term liabilities	19,121		21,294
Total liabilities	1,263,231		1,288,525
Commitments and contingencies (Note 10)
Redeemable noncontrolling interest	6,481		4,772
Equity:
Common stock, par value $0.001 per share; 200,000,000 shares authorized; 50,597,124 and 49,667,340 shares issued and outstanding as of September 30, 2017 and December 31, 2016, respectively	51		50
Additional paid-in capital	896,005		869,463
Retained earnings	266,534		215,352
Accumulated other comprehensive loss	(6,026)		(8,175)
Total stockholders' equity attributable to the Company's stockholders	1,156,564		1,076,690
Noncontrolling interest	77,462		91,582
Total equity	1,234,026		1,168,272
Total liabilities, redeemable noncontrolling interest and equity	$ 2,503,738		$ 2,461,569
[1]	Electricity segment assets include goodwill in the amount of $20.7 million.

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Property, plant and equipment, net	$ 1,621,012	$ 1,556,378
Construction-in-process	$ 350,872	$ 306,709
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)	50,597,124	49,667,340
Common stock, shares outstanding (in shares)	50,597,124	49,667,340
Senior Secured Notes [Member]
Deferred financing costs	$ 8,202	$ 9,177
Other Loans, Limited and Non-recourse [Member]
Deferred financing costs	5,496	6,409
Senior Unsecured Bonds [Member]
Deferred financing costs	617	755
Other Loans, Full Recourse [Member]
Deferred financing costs	1,043	1,346
Variable Interest Entity, Primary Beneficiary [Member]
Property, plant and equipment, net	1,518,962	1,483,224
Construction-in-process	$ 105,848	$ 120,853

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations and Comprehensive Income (Unaudited) - USD ($) shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues:
Revenues	$ 157,185,000	$ 184,617,000	$ 526,447,000	$ 496,072,000
Cost of revenues:
Cost of revenues	97,992,000	110,128,000	322,351,000	291,914,000
Gross profit	59,193,000	74,489,000	204,096,000	204,158,000
Operating expenses:
Research and development expenses	716,000	1,086,000	2,368,000	2,030,000
Selling and marketing expenses	3,630,000	4,793,000	12,083,000	12,136,000
General and administrative expenses	10,877,000	19,093,000	33,027,000	36,625,000
Write-off of unsuccessful exploration activities	0	1,294,000	0	2,714,000
Operating income	43,970,000	48,223,000	156,618,000	150,653,000
Other income (expense):
Interest income	255,000	266,000	861,000	831,000
Interest expense, net	(11,692,000)	(17,137,000)	(41,155,000)	(51,561,000)
Derivatives and foreign currency transaction gains (losses)	(1,001,000)	(222,000)	2,040,000	(2,592,000)
Income attributable to sale of tax benefits	3,506,000	3,463,000	14,019,000	12,380,000
Other non-operating expense, net	(1,592,000)	(5,546,000)	(1,678,000)	(5,306,000)
Income from continuing operations before income taxes and equity in losses of investees	33,446,000	29,047,000	130,705,000	104,405,000
Income tax provision	(6,224,000)	(12,109,000)	(49,993,000)	(29,703,000)
Equity in earnings (losses) of investees, net	337,000	(2,653,000)	(1,690,000)	(4,734,000)
Income from continuing operations	27,559,000	14,285,000	79,022,000	69,968,000
Net income attributable to noncontrolling interest	(3,599,000)	(2,326,000)	(11,228,000)	(4,584,000)
Net income attributable to the Company's stockholders	23,960,000	11,959,000	67,794,000	65,384,000
Comprehensive income:
Net income	27,559,000	14,285,000	79,022,000	69,968,000
Other comprehensive income (loss), net of related taxes:
Change in foreign currency translation adjustments	1,005,000		2,544,000
Change in unrealized gains or losses in respect of the Company's share in derivatives instruments of unconsolidated investment	618,000	1,337,000	271,000	(3,829,000)
Loss in respect of derivative instruments designated for cash flow hedge	20,000	35,000	113,000	105,000
Amortization of unrealized gains in respect of derivative instruments designated for cash flow hedge	(18,000)	(24,000)	(57,000)	(72,000)
Comprehensive income	29,184,000	15,633,000	81,893,000	66,172,000
Comprehensive income attributable to noncontrolling interest	(4,006,000)	(2,326,000)	(11,950,000)	(4,584,000)
Comprehensive income attributable to the Company's stockholders	$ 25,178,000	$ 13,307,000	$ 69,943,000	$ 61,588,000
Basic:
Basic: Net income (in dollars per share)	$ 0.48	$ 0.24	$ 1.36	$ 1.32
Diluted:
Diluted: Net income (in dollars per share)	$ 0.47	$ 0.24	$ 1.34	$ 1.31
Weighted average number of shares used in computation of earnings per share attributable to the Company's stockholders:
Basic (in shares)	50,367	49,599	49,942	49,410
Diluted (in shares)	50,867	50,289	50,669	50,097
Dividend per share declared (in dollars per share)	$ 0.08	$ 0.07	$ 0.33	$ 0.45
Electricity [Member]
Revenues:
Revenues	$ 112,273,000	$ 109,795,000	$ 339,826,000	$ 321,664,000
Cost of revenues:
Cost of revenues	65,774,000	66,481,000	197,249,000	192,410,000
Product [Member]
Revenues:
Revenues	44,912,000	74,822,000	186,621,000	174,408,000
Cost of revenues:
Cost of revenues	$ 32,218,000	$ 43,647,000	$ 125,102,000	$ 99,504,000

Consolidated Statements of Equi

Consolidated Statements of Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	AOCI Attributable to Parent [Member]	Parent [Member]	Noncontrolling Interest [Member]	Total
Balances (in shares) at Dec. 31, 2015	49,107
Balances at Dec. 31, 2015	$ 49	$ 849,223	$ 152,326	$ (8,164)	$ 993,434	$ 93,873	$ 1,087,307
Stock-based compensation		3,383			3,383		3,383
Exercise of options by employees and directors (in shares)	528
Exercise of options by employees and directors	$ 1	7,249			7,250		7,250
Cash paid to noncontrolling interest						(10,622)	(10,622)
Cash dividend declared			(22,469)		(22,469)		(22,469)
Increase in noncontrolling interest in Guadeloupe						8,272	8,272
Net income			65,384		65,384	4,390	69,774
Loss in respect of derivative instruments designated for cash flow hedge				105	105		105
Change in unrealized gains or losses in respect of the Company's share in derivatives instruments of unconsolidated investment				(3,829)	(3,829)		(3,829)
Amortization of unrealized gains in respect of derivative instruments designated for cash flow hedge				(72)	(72)		(72)
Balances (in shares) at Sep. 30, 2016	49,635
Balances at Sep. 30, 2016	$ 50	859,855	195,241	(11,960)	1,043,186	95,913	1,139,099
Currency translation adjustment
Balances (in shares) at Dec. 31, 2016	49,667
Balances at Dec. 31, 2016	$ 50	869,463	215,352	(8,175)	1,076,690	91,582	1,168,272
Stock-based compensation		7,204			7,204		7,204
Exercise of options by employees and directors (in shares)	930
Exercise of options by employees and directors	$ 1	16,382			16,383		16,383
Cash paid to noncontrolling interest						(18,032)	(18,032)
Cash dividend declared			(16,612)		(16,612)		(16,612)
Net income			67,794		67,794	10,154	77,948
Loss in respect of derivative instruments designated for cash flow hedge				113	113		113
Change in unrealized gains or losses in respect of the Company's share in derivatives instruments of unconsolidated investment				271	271		271
Amortization of unrealized gains in respect of derivative instruments designated for cash flow hedge				(57)	(57)		(57)
Balances (in shares) at Sep. 30, 2017	50,597
Balances at Sep. 30, 2017	$ 51	896,005	266,534	(6,026)	1,156,564	77,462	1,234,026
Buyout of Class B membership in ORTP		2,956			2,956	(6,964)	(4,008)
Currency translation adjustment				$ 1,822	$ 1,822	$ 722	$ 2,544

Consolidated Statements of Equ6

Consolidated Statements of Equity (Unaudited) (Parentheticals) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Retained Earnings [Member]
Cash dividend declared, per share (in dollars per share)	$ 0.33	$ 0.45
Amortization of unrealized gains, tax	$ 35	$ 44
Cash dividend declared, per share (in dollars per share)	$ 0.33	$ 0.45

Condensed Consolidated Stateme7

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities:
Net income	$ 79,022,000	$ 69,968,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	81,010,000	77,565,000
Amortization of premium from senior unsecured bonds		(513,000)
Accretion of asset retirement obligation	1,392,000	1,243,000
Stock-based compensation	7,204,000	3,383,000
Amortization of deferred lease income	(2,014,000)	(2,014,000)
Income attributable to sale of tax benefits, net of interest expense	(8,851,000)	(5,920,000)
Equity in losses of investees	1,690,000	4,735,000
Mark-to-market of derivative instruments	(764,000)	(381,000)
Write-off of unsuccessful exploration activities	0	2,714,000
Gain on severance pay fund asset	(1,463,000)	(690,000)
Deferred income tax provision and deferred charges	38,123,000	20,742,000
Liability for unrecognized tax benefits	568,000	191,000
Deferred lease revenues	(274,000)	(625,000)
Other	501,000
Changes in operating assets and liabilities, net of amounts acquired:
Receivables	(10,808,000)	(13,711,000)
Costs and estimated earnings in excess of billings on uncompleted contracts	10,111,000	(12,905,000)
Inventories	(209,000)	5,339,000
Prepaid expenses and other	(636,000)	(5,364,000)
Deposits and other	1,231,000	(867,000)
Accounts payable and accrued expenses	(3,655,000)	10,463,000
Billings in excess of costs and estimated earnings on uncompleted contracts	25,344,000	(3,242,000)
Liabilities for severance pay	1,764,000	(369,000)
Other long-term liabilities	(2,065,000)	1,801,000
Net cash provided by operating activities	166,533,000	158,027,000
Cash flows from investing activities:
Net change in restricted cash, cash equivalents and marketable securities	(8,297,000)	(1,022,000)
Capital expenditures	(177,410,000)	(107,951,000)
Investment in unconsolidated companies	(37,867,000)
Buyout of Class B membership in ORTP	(2,357,000)
Cash paid for acquisition of controlling interest in a subsidiary, net of cash acquired	(35,300,000)	(18,135,000)
Intangible assets acquired	(868,000)
Decrease (increase) in severance pay fund asset, net of payments made to retired employees	529,000	1,919,000
Net cash used in investing activities	(261,570,000)	(125,189,000)
Cash flows from financing activities:
Proceeds from exercise of options by employees	16,382,000	7,250,000
Proceeds from issuance of senior unsecured notes, net of transaction costs		203,483,000
Purchase of Senior unsecured notes		(249,468,000)
Prepayment of OFC Senior Secured Notes	(14,270,000)	(6,815,000)
Proceeds from revolving credit lines with banks	695,600,000	259,900,000
Repayment of revolving credit lines with banks	(661,700,000)	(259,900,000)
Cash received from noncontrolling interest	2,017,000	1,972,000
Repayments of long-term debt	(55,226,000)	(40,997,000)
Cash paid to noncontrolling interest	(18,032,000)	(17,296,000)
Payments of capital leases	(1,472,000)	(845,000)
Deferred debt issuance costs	(4,652,000)	(3,506,000)
Cash dividends paid	(16,612,000)	(22,469,000)
Net cash used in financing activities	(57,965,000)	(128,691,000)
Net change in cash and cash equivalents	(153,002,000)	(95,853,000)
Cash and cash equivalents at beginning of period	230,214,000	185,919,000
Cash and cash equivalents at end of period	77,212,000	90,066,000
Supplemental non-cash investing and financing activities:
Increase (decrease) in accounts payable related to purchases of property, plant and equipment	982,000	(4,517,000)
Accrued liabilities related to financing activities		$ 6,291,000

Note 1 - General and Basis of P

Note 1 - General and Basis of Presentation	9 Months Ended
	Sep. 30, 2017
Notes to Financial Statements
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]	NOTE 1 These unaudited condensed consolidated interim financial statements of Ormat Technologies, Inc. and its subsidiaries (collectively, the “Company”) have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) and pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”) for interim financial statements. Accordingly, they do not September 30, 2017, three nine September 30, 2017 2016 nine September 30, 2017 2016. 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 three nine September 30, 2017 not December 31, 2017. These unaudited condensed 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, 2016. December 31, 2016 December 31, 2016, not 10 2016 10 December 31, 2017. Dollar amounts, except per share data, in the notes to these financial statements are rounded to the closest $1,000. Restatement of p r eviously is s u e d condensed consolidated financ i a l statements As described further in Note 11, second 2017, first 2018, three nine September 30, 2017, 2027, $4.8 three September 30, 2017 $21.7 nine September 30, 2017. three nine September 30, 2017 Revision of previously issued condensed consolidated financial statements The Company had previously identified certain other tax errors, including a prior period error related to the translation of deferred tax liabilities in the Company’s Kenyan subsidiary, which were previously determined to be immaterial and were previously corrected for as out-of-period adjustments in the period of identification. The Company assessed the materiality of these errors in accordance with the SEC’s Staff Accounting Bulletin (“SAB”) Topic 1.M, 250, 250” three nine September 30, 2016 not 10 three nine September 30, 2016 $0.1 $0.3 January 1 December 31, 2016 $3.9 $1.3 2016, The effects of the 2017 2016 September 30, 2017 December 31, 2016 September 30, 2017 December 31, 2016 As originally reported Adjustments As Restated As originally reported Adjustments As Revised Deferred income tax liabilities $ 54,495 $ 23,419 $ 77,914 $ 35,382 $ 1,029 $ 36,411 Liability for unrecognized tax benefits 6,188 - 6,188 5,738 706 6,444 Total liabilities 1,239,812 23,419 1,263,231 1,286,790 1,735 1,288,525 Retained earnings 289,561 (23,027 ) 266,534 216,644 (1,292 ) 215,352 Accumulated other comprehensive loss (5,634 ) (392 ) (6,026 ) (7,732 ) (443 ) (8,175 ) Total stockholders’ equity attributable to the Company stockholders 1,179,983 (23,419 ) 1,156,564 1,078,425 (1,735 ) 1,076,690 Total equity 1,257,445 (23,419 ) 1,234,026 1,170,007 (1,735 ) 1,168,272 The effects of the 2017 2016 three nine September 30, 2017 2016 Three months ended September 30, 2017 Nine months ended September 30, 2017 As originally reported Adjustments As Restated As originally reported Adjustments As Restated Income tax provision $ (11,003 ) $ 4,779 $ (6,224 ) $ (28,258 ) $ (21,735 ) $ (49,993 ) Income from continuing operations 22,780 4,779 27,559 100,757 (21,735 ) 79,022 Net income attributable to the Company’s stockholders 19,181 4,779 23,960 89,529 (21,735 ) 67,794 Loss in respect of derivative instruments designated for cash flow hedge 20 - 20 62 51 113 Comprehensive income 24,405 4,779 29,184 103,577 (21,684 ) 81,893 Comprehensive income attributable to the Company’s stockholders 20,399 4,779 25,178 91,627 (21,684 ) 69,943 Net income per share attributable to the Company’s stockholders Basic: $ 0.38 $ 0.10 $ 0.48 $ 1.79 $ (0.43 ) $ 1.36 Diluted: $ 0.38 $ 0.09 $ 0.47 $ 1.77 $ (0.43 ) $ 1.34 Three months ended September 30, 2016 Nine months ended September 30, 2016 As originally reported Adjustments As Revised As originally reported Adjustments As Revised Income tax provision $ (11,988 ) $ (121 ) $ (12,109 ) $ (29,387 ) $ (316 ) $ (29,703 ) Income from continuing operations 14,406 (121 ) 14,285 70,284 (316 ) 69,968 Net income attributable to the Company’s stockholders 12,080 (121 ) 11,959 65,700 (316 ) 65,384 Loss in respect of derivative instruments designated for cash flow hedge 22 13 35 65 40 105 Comprehensive income 15,741 (108 ) 15,633 66,448 (276 ) 66,172 Comprehensive income attributable to the Company’s stockholders 13,415 (108 ) 13,307 61,864 (276 ) 61,588 Net income per share attributable to the Company’s stockholders Basic: $ 0.24 $ - $ 0.24 $ 1.33 $ (0.01 ) $ 1.32 Diluted: $ 0.24 $ - $ 0.24 $ 1.31 $ - $ 1.31 The effects of the 2017 2016 nine September 30, 2017 2016 As originally reported Adjustments As Revised Balances as of December 31, 2015: Retained earnings $ 148,396 $ 3,930 $ 152,326 Accumulated other comprehensive loss (7,667 ) (497 ) (8,164 ) Total stockholders’ equity attributable to the Company’s stockholders 990,001 3,433 993,434 Total equity 1,083,874 3,433 1,087,307 Net income for the nine months ended September 30, 2016 70,090 (316 ) 69,774 Net income attributable to the Company’s stockholders for the nine months ended September 30, 2016 65,700 (316 ) 65,384 Loss in respect of derivative instruments designated for cash flow hedge for the nine months ended September 30, 2016 65 40 105 Balances as of September 30, 2016: Retained earnings 191,627 3,614 195,241 Accumulated other comprehensive loss (11,503 ) (457 ) (11,960 ) Total stockholders’ equity attributable to the Company’s stockholders 1,040,029 3,157 1,043,186 Total equity 1,135,942 3,157 1,139,099 As originally reported Adjustments As Restated Balances as of December 31, 2016: Retained earnings $ 216,644 $ (1,292 ) $ 215,352 Accumulated other comprehensive loss (7,732 ) (443 ) (8,175 ) Total stockholders’ equity attributable to the Company’s stockholders 1,078,425 (1,735 ) 1,076,690 Total equity 1,170,007 (1,735 ) 1,168,272 Net income for the nine months ended September 30, 2017 99,683 (21,735 ) 77,948 Net income attributable to the Company’s stockholders for the nine months ended September 30, 2017 89,529 (21,735 ) 67,794 Loss in respect of derivative instruments designated for cash flow hedge for the nine months ended September 30, 2017 62 51 113 Balances as of September 30, 2017: Retained earnings 289,561 (23,027 ) 266,534 Accumulated other comprehensive loss (5,634 ) (392 ) (6,026 ) Total stockholders’ equity attributable to the Company’s stockholders 1,179,983 (23,419 ) 1,156,564 Total equity 1,257,445 (23,419 ) 1,234,026 Although there was with no 2017 2016 nine September 30, 2017 2016 Nine months ended September 30, 2017 Nine months ended September 30, 2016 As originally reported Adjustments As Restated As originally reported Adjustments As Revised Cash flows from operating activities: Net income $ 100,757 $ (21,735 ) $ 79,022 $ 70,284 $ (316 ) $ 69,968 Deferred income tax provision 16,506 21,617 38,123 20,742 - 20,742 Liability for unrecognized tax benefits 450 118 568 (125 ) 316 191 Net cash provided by operating activities 166,533 - 166,533 158,027 - 158,027 The impacts of the restatement and revision have been reflected throughout the financial statements, including the applicable footnotes, as appropriate. This resulted in changes to the deferred tax balances, valuation allowance and effective tax rate, together with other disclosures in Note 11. Platanares geothermal power plant On September 26, 2017, 35 15 30 may OFC Senior Secured Notes prepayment In September 2017, $14.3 $1.5 $0.2 three nine September 30, 2017. DEG Loan prepayment In September 2017, $11.8 $0.5 $0.4 three nine September 30, 2017. ORIX transaction On July 26, 2017, 11 22% May 4, 2017. May 4, 2017, July 26, 2017. Under the Governance Agreement, ORIX has the right to designate three nine fourth 25% Under the Commercial Cooperation Agreement, the Company has exclusive rights to develop, own, operate and provide equipment for ORIX geothermal energy projects in all markets outside of Japan. In addition, the Company has certain rights to serve as technical partner and co-invest in ORIX geothermal energy projects in Japan. ORIX will also assist the Company in obtaining project financing for its geothermal energy projects from a variety of leading providers of renewable energy debt financing with which ORIX has relationships in Asia and around the world. ORTP buyout On March 30, 2017, July 10, 2017, $2.4 SCPPA power purchase agreement During the second 2017, one nine 150 135 185 five 26 December 31, 2043 $75.50 Assertion of permanent reinvestment of foreign unremitted earnings in a subsidiary During the second 2017, $35.3 two may 2018 2021, no 11, second 2017. Viridity transaction On March 15, 2017, $35.3 12.8 two 2017 2020. Using proprietary software and solutions, Viridity serves primarily retail energy providers, utilities, and large commercial and industrial customers. Viridity’s offerings enable its customers to optimize and monetize their energy management, demand response and storage facilities potential by interacting on their behalf with regional transmission organizations and independent system operators. The Company accounted for the transaction in accordance with Accounting Standard Codification 805, $34.7 17 $0.4 $13.9 810, The revenues of Viridity for the period from March 15, 2017 September 30, 2017 three nine September 30, 2017. Accounting guidance provides that the allocation of the purchase price may one Other comprehensive income For the nine September 30, 2017 2016, $5,000 $7,000, $9,000 $11,000, $4,000 $4,000, three September 30, 2017 2016, $2,000 $2,000, $6,000 $3,000 $4,000 $1,000, September 30, 2017, $0.6 Write-offs of unsuccessful exploration activities There were no three nine September 30, 2017. three nine 2016 $1.3 $2.7 2016 not 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 and in foreign countries. At September 30, 2017 December 31, 2016, $23.9 $72.5 seven $250,000 September 30, 2017 December 31, 2016, $56.0 $166.2 At September 30, 2017 December 31, 2016, $67.5 $53.3 September 30, 2017 December 31, 2016, 48% 60% Sierra Pacific Power Company and Nevada Power Company (subsidiaries of NV Energy, Inc.) accounted for 16.3% 14.4% three September 30, 2017 2016, 17.4% 18.6% nine September 30, 2017 2016, Kenya Power and Lighting Co. Ltd. accounted for 17.6% 15.1% three September 30, 2017 2016, 15.7% 16.4% nine September 30, 2017 2016, Southern California Public Power Authority (“SCPPA”) accounted for 9.1% 7.7% three September 30, 2017 2016, 8.9% 9.9% nine September 30, 2017 2016, Hyundai (Sarulla geothermal project) accounted for 0.9% 24% three September 30, 2017 2016, 4.7% 14% nine September 30, 2017 2016, The Company has historically been able to collect on all of its receivable balances, and accordingly, no

Note 2 - New Accounting Pronoun

Note 2 - New Accounting Pronouncements	9 Months Ended
	Sep. 30, 2017
Notes to Financial Statements
New Accounting Pronouncements and Changes in Accounting Principles [Text Block]	NOTE 2 New accounting pronouncements effective in the nine September 30, 2017 Improvement to Employee Share-Based Payment Accounting In March 2016, 2016 09, no 1 2 December 15, 2016. not Interests Held through Related Parties that are under Common Control In October 2016, 2016 17, 810 December 15, 2016, not Simplifying the Measurement of Inventory In July 2015, 2015 11, 330. no December 15, 2016, not New accounting pronouncements effective in future periods Derivatives and Hedging In August 2017, 2017 12, December 15, 2018, Intangibles –Goodwill and Other In January 2017, 2017 04, 350 not 2 2 first first December 15, 2019. January 1, 2017. Compensation - Stock Compensation In May 2017, 2017 09, 718 718. 1 2 3 718 December 15, 2017. Business Combinations In January 2017, 2017 01, 805 not December 15, 2017, Statement of Cash Flows In November 2016, 2016 18, 230 December 15, 2017, Intra-Entity Transfers of Assets Other than Inventory In October 2016, 2016 16, not December 15, 2017, first 2017. Revenues from Contracts with Customers In May 2014, 2014 09, 606, 1 2 3 4 5 2014 09 December 15, 2017, no 2017 840, In March 2016, 2016 08, not December 15, 2017, no 2017 Leases In February 2016, 2016 02, 842. two 606. December 15, 2018, Recognition and Measurement of Financial Assets and Financial Liabilities In January 2016, 2016 01, December 15, 2017,

Note 3 - Inventories

Note 3 - Inventories	9 Months Ended
	Sep. 30, 2017
Notes to Financial Statements
Inventory Disclosure [Text Block]	NOTE 3 Inventories consist of the following: September 30, December 31, 2017 2016 (Dollars in thousands) Raw materials and purchased parts for assembly $ 9,461 $ 5,429 Self-manufactured assembly parts and finished products 9,224 6,571 Total $ 18,685 $ 12,000

Note 4 - Unconsolidated Investm

Note 4 - Unconsolidated Investments	9 Months Ended
	Sep. 30, 2017
Notes to Financial Statements
Equity Method Investments and Joint Ventures Disclosure [Text Block]	NOTE 4 Unconsolidated investments consist of the following: September 30, December 31, 2017 2016 (Dollars in thousands) Sarulla $ 25,367 $ (11,081 ) The Sarulla Project The Company holds a 12.75% 330 April 4, 2013. 30 October 2013, The project is being constructed in three 110 first March 17, 2017 second October 2, 2017. third may third 100% 85% On May 16, 2014, $1.17 six $1.17 $0.1 May 23, 2014) $1.07 may The Sarulla consortium entered into interest rate swap agreements with various international banks, effective as of June 4, 2014, $0.96 $1.07 3.4565%. three nine September 30, 2017, $4.8 $2.1 $0.6 $0.3 three nine September 30, 2016, $10.5 $30.0 $1.3 $3.8 September 30, 2017 $5.6 The Company had added the $255.6 2014. third 2014 $14.1 During the three nine September 30, 2017, $10.5 $37.9 $49.8

Note 5 - Fair Value of Financia

Note 5 - Fair Value of Financial Instruments	9 Months Ended
	Sep. 30, 2017
Notes to Financial Statements
Fair Value Disclosures [Text Block]	NOTE 5— 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 September 30, 2017 December 31, 2016 September 30, 2017 Fair Value Carrying Value at September 30, 2017 Total Level 1 Level 2 Level 3 (Dollars in thousands) Assets: Current assets: Cash equivalents (including restricted cash accounts) $ 13,497 $ 13,497 $ 13,497 $ — $ — Derivatives: Put options on gas price (3) 61 61 — 61 — Contingent receivable (1) 1,125 1,125 — — 1,125 Currency forward contracts (2) 486 486 — 486 — Liabilities: Current and long-term liabilities: Derivatives: Contingent payables (1) $ (25,913 ) $ (25,913 ) $ — $ — $ (25,913 ) Warrants (1) (3,889 ) (3,889 ) (3,889 ) Currency forward contracts (2) (203 ) (203 ) — (203 ) — $ (14,836 ) $ (14,836 ) $ 13,497 $ 344 $ (28,677 ) December 31, 2016 Fair Value Carrying Value at December 31, 2016 Total Level 1 Level 2 Level 3 (Dollars in thousands) Assets Current assets: Cash equivalents (including restricted cash accounts) $ 14,922 $ 14,922 $ 14,922 $ — $ — Derivatives: Contingent receivable (1) 1,443 1,443 — — 1,443 Liabilities: Current and long-term liabilities: Derivatives: Contingent payables (1) $ (11,581 ) $ (11,581 ) $ — $ — $ (11,581 ) Warrants (1) (3,429 ) (3,429 ) — — (3,429 ) Currency forward contracts (2) (481 ) (481 ) — (481 ) — $ 874 $ 874 $ 14,922 $ (481 ) $ (13,567 ) ( 1 These amounts relate to contingent receivables and payables relating to the Viridity acquisition and 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 September 30, 2017 December 31, 2016 ( 2 These amounts relate to currency forward contracts valued primarily based on observable inputs, including forward and spot prices for currencies, net of contracted rates and then multiplied by notional amounts, and are included within Prepaid expenses and other and Accounts payable and accrued expenses on September 30, 2017 December 31, 2016, ( 3 These amounts relate to natural gas put options, valued primarily based on observable inputs, including spot prices on related commodity indices, and are included within Prepaid expenses and other on September 30, 2017 The amounts set forth in the tables above include investments in debt instruments and money market funds (which are included in cash equivalents). Those securities and deposits are classified within Level 1 The following table presents the amounts of gain (loss) recognized in the consolidated statements of operations and comprehensive income on derivative instruments not Amount of recognized gain (loss) Derivatives not designated Location of recognized Three Months Ended September 30, Nine Months Ended September 30, as hedging instruments gain (loss) 2017 2016 2017 2016 Put options on natural gas price Derivatives and foreign currency transaction gains (losses) $ (121 ) $ — $ (362 ) $ — Call options on natural gas price Derivatives and foreign currency transaction gains (losses) — 32 — (1,114 ) Call and put options on oil price Derivatives and foreign currency transaction gains (losses) — 230 — (1,312 ) Contingent considerations Derivative and foreign currency transaction gains (losses) (19 ) — (114 ) — Currency forward contracts Derivative and foreign currency and transaction gains (losses) (887 ) 689 2,832 1,154 $ (1,027 ) $ 951 $ 2,356 $ (1,272 ) In January 2017, 4.1 $3 January 26, 2017 November 27, 2017 $0.7 On February 2, 2016, 4.1 $2 February 24, 2016 December 27, 2016 $1.9 On February 24, 2016, 185,000 $32.80 $35.50 March 24, 2016 December 22, 2016 $1.1 March 2016, 2 31,800 $41 $42.50 $32.80 $33.50. 16,500 17,000 February 2016 $28.50 $37.50 $28 $38.50, The foregoing future and forward transactions were not There were no 1, 2 3 nine September 30, 2017. The fair value of the Company’s long-term debt approximates its carrying amount, except for the following: Fair Value Carrying Amount September 30, 2017 December 31, 2016 September 30, 2017 December 31, 2016 (Dollars in millions) (Dollars in millions) Olkaria III Loan - DEG $ — $ 16.3 $ — $ 15.8 Olkaria III Loan - OPIC 242.9 253.4 233.1 246.6 Olkaria IV Loan - DEG 2 52.4 50.9 50.0 50.0 Amatitlan Loan 34.2 37.3 34.1 36.8 Senior Secured Notes: Ormat Funding Corp. ("OFC") — 17.0 — 17.0 OrCal Geothermal Inc. ("OrCal") 34.1 37.4 32.1 35.2 OFC 2 LLC ("OFC 2") 242.5 249.0 236.6 247.2 Don A. Campbell 1 ("DAC1") 88.2 88.9 89.6 92.4 Senior Unsecured Bonds 201.4 200.1 204.3 204.3 Other long-term debt 7.3 10.4 8.0 11.2 The fair value of the OFC Senior Secured Notes is determined using observable market prices as these securities are traded. The fair value of all the other long-term debt is determined by a valuation model, which is based on a conventional discounted cash flow methodology and utilizes assumptions of current borrowing rates. The fair value of revolving lines of credit is determined using a comparison of market-based price sources that are reflective of similar credit ratings to those of the Company. The carrying value of other financial instruments, such as revolving lines of credit, deposits, and other long-term debt approximates fair value. The following table presents the fair value of financial instruments as of September 30, 2017: Level 1 Level 2 Level 3 Total (Dollars in millions) Olkaria III - OPIC $ — $ — $ 242.9 $ 242.9 Olkaria IV - DEG 2 — — 52.4 52.4 Amatitlan Loan — 34.2 — 34.2 Senior Secured Notes: OrCal — — 34.1 34.1 OFC 2 — — 242.5 242.5 Don A. Campbell 1 — — 88.2 88.2 Senior Unsecured Bonds — — 201.4 201.4 Other long-term debt — — 7.3 7.3 Revolving lines of credit — 33.9 — 33.9 Deposits 15.2 — — 15.2 The following table presents the fair value of financial instruments as of December 31, 2016: Level 1 Level 2 Level 3 Total (Dollars in millions) Olkaria III Loan - DEG $ — $ — $ 16.3 $ 16.3 Olkaria III Loan - OPIC — — 253.4 253.4 Olkaria IV - DEG 2 — — 50.9 50.9 Amatitlan Loan — 37.3 — 37.3 Senior Secured Notes: OFC — 17.0 — 17.0 OrCal — — 37.4 37.4 OFC 2 — — 249.0 249.0 Don A. Campbell 1 — — 88.9 88.9 Senior Unsecured Bonds — — 200.1 200.1 Other long-term debt — 3.3 7.1 10.4 Deposits 14.4 — — 14.4

Note 6 - Stock-based Compensati

Note 6 - Stock-based Compensation	9 Months Ended
	Sep. 30, 2017
Notes to Financial Statements
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]	NOTE 6 The 2004 In 2004, 2004 “2004 2004 3,750,000 2004 25% 24 25% 36 50% 48 2004 one may ten 2004 2004 May 2012 2012 “2012 2004 The 2012 In May 2012, 2012 2012 4,000,000 2012 25% 24 25% 36 50% 48 2012 one six ten 2012 The 2012 2012 February 2014 2012 ● Increase of per grant limit: Section 15 2012 400,000 ● Acceleration of vesting: Section 15 2012 2012

Note 7 - Interest Expense, Net

Note 7 - Interest Expense, Net	9 Months Ended
	Sep. 30, 2017
Notes to Financial Statements
Interest Expense Disclosure [Text Block]	NOTE 7 The components of interest expense are as follows: Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 Interest related to sale of tax benefits $ 1,607 $ 2,565 $ 5,468 $ 6,269 Interest expense 13,299 15,726 41,620 47,214 Less — amount capitalized (3,214 ) (1,154 ) (5,933 ) (1,922 ) $ 11,692 $ 17,137 $ 41,155 $ 51,561

Note 8 - Earnings Per Share

Note 8 - Earnings Per Share	9 Months Ended
	Sep. 30, 2017
Notes to Financial Statements
Earnings Per Share [Text Block]	NOTE 8 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: Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 Weighted average number of shares used in computation of basic earnings per share 50,367 49,599 49,942 49,410 Add: Additional shares from the assumed exercise of employee stock options 500 690 727 687 Weighted average number of shares used in computation of diluted earnings per share 50,867 50,289 50,669 50,097 The number of stock-based awards that could potentially dilute future earnings per share and that were not 8,851 225,191 three September 30, 2017 2016, 6,494 116,641 nine September 30, 2017 2016,

Note 9 - Business Segments

Note 9 - Business Segments	9 Months Ended
	Sep. 30, 2017
Notes to Financial Statements
Segment Reporting Disclosure [Text Block]	NOTE 9 The Company has two 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: Electricity Product Consolidated (Dollars in thousands) Three Months Ended September 30, 2017: Net revenue from external customers $ 112,273 $ 44,912 $ 157,185 Intersegment revenue — 28,248 28,248 Operating income 36,205 7,765 43,970 Segment assets at period end (1) 2,371,855 131,883 2,503,738 Three Months Ended September 30, 2016: Net revenue from external customers $ 109,795 $ 74,822 184,617 Intersegment revenue — 14,835 14,835 Operating income 23,903 24,320 48,223 Segment assets at period end 2,137,845 141,426 2,279,271 Nine Months Ended September 30, 2017: Net revenues from external customers $ 339,826 $ 186,621 526,447 Intersegment revenues — 61,026 61,026 Operating income 113,220 43,398 156,618 Segment assets at period end (1) 2,371,855 131,883 2,503,738 Nine Months Ended September 30, 2016: Net revenues from external customers $ 321,664 $ 174,408 496,072 Intersegment revenues — 36,042 36,042 Operating income 91,502 59,151 150,653 Segment assets at period end 2,137,845 141,426 2,279,271 ( 1 Electricity segment assets include goodwill in the amount of $20.7 Reconciling information between reportable segments and the Company’s consolidated totals is shown in the following table: Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 Revenue: Total segment revenue $ 157,185 $ 184,617 $ 526,447 $ 496,072 Intersegment revenue 28,248 14,835 61,026 36,042 Elimination of intersegment revenue (28,248 ) (14,835 ) (61,026 ) (36,042 ) Total consolidated revenue $ 157,185 $ 184,617 $ 526,447 $ 496,072 Operating income: Operating income $ 43,970 $ 48,223 $ 156,618 $ 150,653 Interest income 255 266 861 831 Interest expense, net (11,692 ) (17,137 ) (41,155 ) (51,561 ) Derivatives and foreign currency transaction gains (losses) (1,001 ) (222 ) 2,040 (2,592 ) Income attributable to sale of tax benefits 3,506 3,463 14,019 12,380 Other non-operating expense, net (1,592 ) (5,546 ) (1,678 ) (5,306 ) Total consolidated income before income taxes and equity in losses of investees $ 33,446 $ 29,047 $ 130,705 $ 104,405

Note 10 - Commitments and Conti

Note 10 - Commitments and Contingencies	9 Months Ended
	Sep. 30, 2017
Notes to Financial Statements
Commitments and Contingencies Disclosure [Text Block]	NOTE 10 ● Jon Olson and Hilary Wilt, together with Puna Pono Alliance filed a complaint on February 17, 2015 16 May 17, 2015, October 10, 2016, January 23, 2017, April 20, 2017 ● On July 8, 2014, two three 1, June 26, 2015, one January 6, 2017, January 6, 2017 No ● On March 29, 2016, 27 th $4.8 3.75% 10 11th 27th 11th not ● On August 5, 2016, December 12, 2016, August 2014. June 14, 2017, ● On June 20, 2016, March 31, 2016. May 25, 2017. 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 its business. These actions typically seek, among other things, compensation for alleged personal injury, breach of contract, property damage, punitive damages, civil penalties or other losses, or injunctive or declaratory relief. With respect to such lawsuits, claims and proceedings, the Company accrues reserves when a loss is probable and the amount of such loss can be reasonably estimated. It is the opinion of the Company’s management that the outcome of these proceedings, individually and collectively, will not

Note 11 - Income Taxes (Restate

Note 11 - Income Taxes (Restated)	9 Months Ended
	Sep. 30, 2017
Notes to Financial Statements
Income Tax Disclosure [Text Block]	NOTE 11 As further described in Note 1, 2017, 2016, three nine September 30, 2017 2016. 1 second 2017, $111.1 35%. $53.9 $111.1 Realization of the deferred tax assets and tax credits is dependent on generating sufficient taxable income in appropriate jurisdictions prior to expiration of the NOL carryforwards and tax credits. In prior periods and through March 31, 2017, March 31, 2017, $116.2 $39.9 not $76.0 $0.3 $76.3 September 30, 2017. The Company’s effective tax rate for the three September 30, 2017 2016 18.6% 41.7%, 38.2% 28.4% nine September 30, 2017 2016, 35% nine September 30, 2017 16%, 37.5%; three September 30, 2017 2016 $0.6 nine September 30, 2017 2016 $2.3 $2.4 As described above, the Company recorded a partial valuation allowance against the Company’s foreign tax credits and state net operating loss that are expected to expire before they can be utilized in future periods. As of December 31, 2016, $331.5 2029 2036, $231.1 2018 2036 $83.2 December 31, 2016 20 2026 2036. The total amount of undistributed earnings of foreign subsidiaries related to Ormat Systems for income tax purposes was approximately $367 December 31, 2016. no may not may The Company is subject to income taxes in the U.S. (federal and state) and numerous foreign jurisdictions. Significant judgment is required in evaluating tax positions and determining the position for income taxes. Reserves are established to tax-related uncertainties based on estimates of whether, and the extent to which additional taxes will be due. As of September 30, 2017, not As previously reported by the Company, the Kenya Revenue Authority (“KRA”) conducted an audit related to the Company’s operations in Kenya for fiscal years 2012 2013. June 20, 2017, $2.6 June 2017 150% $1.2

Note 12 - Subsequent Events

Note 12 - Subsequent Events	9 Months Ended
	Sep. 30, 2017
Notes to Financial Statements
Subsequent Events [Text Block]	NOTE 12 SUBSEQUENT EVENTS Cash dividend On November 7, 2017, $4.0 $0.08 November 21, 2017, December 5, 2017. OPC buyout On May 31, 2017, October 31, 2017, $1.9 Events subsequent to original issuance of financial statements Cash dividend On March 1, 2018, $11.5 $0.23 March 14, 2018, March 29, 2018. On May 7, 2018, $5.1 $0.10 May 21, 2018, May 30, 2018. Compliance with financial covenants In relation to covenants in certain debt facilities, which require timely filing of quarterly financial statements, the Company received waivers from each of its and its subsidiaries’ lenders as follows: ● The Company received waivers extending the period required to file the quarterly condensed consolidated financial statements for the three March 31, 2018 May 30, 2018 ● The deeds of trust governing the Company’s series 2 3 June 14, 2018 three March 31, 2018. not not not 10 March 31, 2018. may Following the filing of such condensed consolidated financial statements and the filing of the restated consolidated financial statements for the fiscal year ended December 31, 2017 second third 2017, Legal proceedings On May 21, 2018, 44366 05 18 eleven 93 $26 August 3, 2017 May 13, 2018. On June 11, 2018, August 8, 2017 May 15, 2018 10 10b 5 20 10 December 31, 2016 2017, 10 nine September 30, 2017 not Tungsten Mountain partnership transaction On May 17, 2018, one 26 $33.4 $13 Puna On May 3, 2018, 38 three $109 Platanares loan On April 30, 2018, $124.7 35 may three 14 second 2018. 6.75% 7.25% U.S. Geothermal transaction On April 24, 2018, $110 $106 $4 ● three 38 ● development assets which include a project at the Geysers, California; a second The Company accounted for the transaction in accordance with ASC 805, 810, may one 2017 01, 2 not The Company deemed the transaction to not not Migdal Senior Unsecured Loan On March 22, 2018, $100 15 $4.2 September 15, 2021, $37 March 15, 2029. 4.8% The Migdal Loan is subject to early redemption by the Company prior to maturity from time to time (but not 0.50%. 0.25% no 1% 0.25% no 4.8% 4.5, 0.5% The Migdal Loan constitutes senior unsecured indebtedness of the Company and will rank equally in right of payment with any existing and future senior unsecured indebtedness of the Company, and effectively junior to any existing and future secured indebtedness, to the extent of the security therefore. The Migdal Loan Agreement includes various affirmative and negative covenants, including a covenant that the Company maintain (i) a debt to adjusted EBITDA ratio below 6, not $650 not 25%. $800 one not 50% March 27, 2018 Tungsten Mountain On December 13, 2017, 24 December 1, 2017. 26 October 20, 2016, June 2017. $15

Significant Accounting Policies

Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2017
Accounting Policies [Abstract]
Reclassification, Policy [Policy Text Block]	Restatement of p r eviously is s u e d condensed consolidated financ i a l statements As described further in Note 11, second 2017, first 2018, three nine September 30, 2017, $4.8 three September 30, 2017 $21.7 nine September 30, 2017. three nine September 30, 2017 Revis i on of p r eviously is s u e d condensed consolidated financ i a l statements The Company had previously identified certain other tax errors, including a prior period error related to the translation of deferred tax liabilities in the Company’s Kenyan subsidiary and an error in the effective tax rate calculation in the first 2016, The Company assessed the materiality of these errors in accordance with the SEC’s Staff Accounting Bulletin (“SAB”) Topic 1.M, 250, 250” three nine September 30, 2016 not 10 three nine September 30, 2016 $0.1 $0.3 January 1 December 31, 2016 $3.9 $1.3 2016, The effects of the 2017 2016 September 30, 2017 December 31, 2016 September 30, 2017 December 31, 2016 As originally reported Adjustments As Restated As originally reported Adjustments As Revised Deferred income tax liabilities $ 54,495 $ 23,419 $ 77,914 $ 35,382 $ 1,029 $ 36,411 Liability for unrecognized tax benefits 6,188 - 6,188 5,738 706 6,444 Total liabilities 1,239,812 23,419 1,263,231 1,286,790 1,735 1,288,525 Retained earnings 289,561 (23,027 ) 266,534 216,644 (1,292 ) 215,352 Accumulated other comprehensive loss (5,634 ) (392 ) (6,026 ) (7,732 ) (443 ) (8,175 ) Total stockholders’ equity attributable to the Company stockholders 1,179,983 (23,419 ) 1,156,564 1,078,425 (1,735 ) 1,076,690 Total equity 1,257,445 (23,419 ) 1,234,026 1,170,007 (1,735 ) 1,168,272 The effects of the 2017 2016 three nine September 30, 2017 2016 Three months ended September 30, 2017 Nine months ended September 30, 2017 As originally reported Adjustments As Restated As originally reported Adjustments As Restated Income tax provision $ (11,003 ) $ 4,779 $ (6,224 ) $ (28,258 ) $ (21,735 ) $ (49,993 ) Income from continuing operations 22,780 4,779 27,559 100,757 (21,735 ) 79,022 Net income attributable to the Company’s stockholders 19,181 4,779 23,960 89,529 (21,735 ) 67,794 Loss in respect of derivative instruments designated for cash flow hedge 20 - 20 62 51 113 Comprehensive income 24,405 4,779 29,184 103,577 (21,684 ) 81,893 Comprehensive income attributable to the Company’s stockholders 20,399 4,779 25,178 91,627 (21,684 ) 69,943 Net income per share attributable to the Company’s stockholders Basic: $ 0.38 $ 0.10 $ 0.48 $ 1.79 $ (0.43 ) $ 1.36 Diluted: $ 0.38 $ 0.09 $ 0.47 $ 1.77 $ (0.43 ) $ 1.34 Three months ended September 30, 2016 Nine months ended September 30, 2016 As originally reported Adjustments As Revised As originally reported Adjustments As Revised Income tax provision $ (11,988 ) $ (121 ) $ (12,109 ) $ (29,387 ) $ (316 ) $ (29,703 ) Income from continuing operations 14,406 (121 ) 14,285 70,284 (316 ) 69,968 Net income attributable to the Company’s stockholders 12,080 (121 ) 11,959 65,700 (316 ) 65,384 Loss in respect of derivative instruments designated for cash flow hedge 22 13 35 65 40 105 Comprehensive income 15,741 (108 ) 15,633 66,448 (276 ) 66,172 Comprehensive income attributable to the Company’s stockholders 13,415 (108 ) 13,307 61,864 (276 ) 61,588 Net income per share attributable to the Company’s stockholders Basic: $ 0.24 $ - $ 0.24 $ 1.33 $ (0.01 ) $ 1.32 Diluted: $ 0.24 $ - $ 0.24 $ 1.31 $ - $ 1.31 The effects of the 2017 2016 nine September 30, 2017 2016 As originally reported Adjustments As Revised Balances as of December 31, 2015: Retained earnings $ 148,396 $ 3,930 $ 152,326 Accumulated other comprehensive loss (7,667 ) (497 ) (8,164 ) Total stockholders’ equity attributable to the Company’s stockholders 990,001 3,433 993,434 Total equity 1,083,874 3,433 1,087,307 Net income for the nine months ended September 30, 2016 70,090 (316 ) 69,774 Net income attributable to the Company’s stockholders for the nine months ended September 30, 2016 65,700 (316 ) 65,384 Loss in respect of derivative instruments designated for cash flow hedge for the nine months ended September 30, 2016 65 40 105 Balances as of September 30, 2016: Retained earnings 191,627 3,614 195,241 Accumulated other comprehensive loss (11,503 ) (457 ) (11,960 ) Total stockholders’ equity attributable to the Company’s stockholders 1,040,029 3,157 1,043,186 Total equity 1,135,942 3,157 1,139,099 As originally reported Adjustments As Restated Balances as of December 31, 2016: Retained earnings $ 216,644 $ (1,292 ) $ 215,352 Accumulated other comprehensive loss (7,732 ) (443 ) (8,175 ) Total stockholders’ equity attributable to the Company’s stockholders 1,078,425 (1,735 ) 1,076,690 Total equity 1,170,007 (1,735 ) 1,168,272 Net income for the nine months ended September 30, 2017 99,683 (21,735 ) 77,948 Net income attributable to the Company’s stockholders for the nine months ended September 30, 2017 89,529 (21,735 ) 67,794 Loss in respect of derivative instruments designated for cash flow hedge for the nine months ended September 30, 2017 62 51 113 Balances as of September 30, 2017: Retained earnings 289,561 (23,027 ) 266,534 Accumulated other comprehensive loss (5,634 ) (392 ) (6,026 ) Total stockholders’ equity attributable to the Company’s stockholders 1,179,983 (23,419 ) 1,156,564 Total equity 1,257,445 (23,419 ) 1,234,026 Although there was with no 2017 2016 nine September 30, 2017 2016 Nine months ended September 30, 2017 Nine months ended September 30, 2016 As originally reported Adjustments As Restated As originally reported Adjustments As Revised Cash flows from operating activities: Net income $ 100,757 $ (21,735 ) $ 79,022 $ 70,284 $ (316 ) $ 69,968 Deferred income tax provision 16,506 21,617 38,123 20,742 - 20,742 Liability for unrecognized tax benefits 450 118 568 (125 ) 316 191 Net cash provided by operating activities 166,533 - 166,533 158,027 - 158,027 The impacts of the restatement and revision have been reflected throughout the financial statements, including the applicable footnotes, as appropriate.
Platanares Geothermal Power Plant, Policy [Policy Text Block]	Platanares geothermal power plant On September 26, 2017, 35 15 30 may
OFC Senior Secured Notes Prepayment, Policy [Policy Text Block]	OFC Senior Secured Notes prepayment In September 2017, $14.3 $1.5 $0.2 three nine September 30, 2017.
DEG Loan Prepayment, Policy [Policy Text Block]	DEG Loan prepayment In September 2017, $11.8 $0.5 $0.4 three nine September 30, 2017.
ORIX Transaction, Policy [Policy Text Block]	ORIX transaction On July 26, 2017, 11 22% May 4, 2017. May 4, 2017, July 26, 2017. Under the Governance Agreement, ORIX has the right to designate three nine fourth 25% Under the Commercial Cooperation Agreement, the Company has exclusive rights to develop, own, operate and provide equipment for ORIX geothermal energy projects in all markets outside of Japan. In addition, the Company has certain rights to serve as technical partner and co-invest in ORIX geothermal energy projects in Japan. ORIX will also assist the Company in obtaining project financing for its geothermal energy projects from a variety of leading providers of renewable energy debt financing with which ORIX has relationships in Asia and around the world.
ORTP Buyout, Policy [Policy Text Block]	ORTP buyout On March 30, 2017, July 10, 2017, $2.4
SCPPA Power Purchase Agreement, policy [Policy Text Block]	SCPPA power purchase agreement During the second 2017, one nine 150 135 185 five 26 December 31, 2043 $75.50
Assertion of Permanent Reinvestment of Foreign Unremitted Earnings in Subsidiaries, Policy [Policy Text Block]	Assertion of permanent reinvestment of foreign unremitted earnings in a subsidiary During the second 2017, $35.3 two may 2018 2021, no 11, second 2017.
Business Combinations Policy [Policy Text Block]	Viridity transaction On March 15, 2017, $35.3 12.8 two 2017 2020. Using proprietary software and solutions, Viridity serves primarily retail energy providers, utilities, and large commercial and industrial customers. Viridity’s offerings enable its customers to optimize and monetize their energy management, demand response and storage facilities potential by interacting on their behalf with regional transmission organizations and independent system operators. The Company accounted for the transaction in accordance with Accounting Standard Codification 805, $34.7 17 $0.4 $13.9 810, The revenues of Viridity for the period from March 15, 2017 September 30, 2017 three nine September 30, 2017. Accounting guidance provides that the allocation of the purchase price may one
Comprehensive Income, Policy [Policy Text Block]	Other comprehensive income For the nine September 30, 2017 2016, $5,000 $7,000, $9,000 $11,000, $4,000 $4,000, three September 30, 2017 2016, $2,000 $2,000, $6,000 $3,000 $4,000 $1,000, September 30, 2017, $0.6
Exploratory Drilling Costs Capitalization and Impairment, Policy [Policy Text Block]	Write-offs of unsuccessful exploration activities There were no three nine September 30, 2017. three nine 2016 $1.3 $2.7 2016 not
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 and in foreign countries. At September 30, 2017 December 31, 2016, $23.9 $72.5 seven $250,000 September 30, 2017 December 31, 2016, $56.0 $166.2 At September 30, 2017 December 31, 2016, $67.5 $53.3 September 30, 2017 December 31, 2016, 48% 60% Sierra Pacific Power Company and Nevada Power Company (subsidiaries of NV Energy, Inc.) accounted for 16.3% 14.4% three September 30, 2017 2016, 17.4% 18.6% nine September 30, 2017 2016, Kenya Power and Lighting Co. Ltd. accounted for 17.6% 15.1% three September 30, 2017 2016, 15.7% 16.4% nine September 30, 2017 2016, Southern California Public Power Authority (“SCPPA”) accounted for 9.1% 7.7% three September 30, 2017 2016, 8.9% 9.9% nine September 30, 2017 2016, Hyundai (Sarulla geothermal project) accounted for 0.9% 24% three September 30, 2017 2016, 4.7% 14% nine September 30, 2017 2016, The Company has historically been able to collect on all of its receivable balances, and accordingly, no
New Accounting Pronouncements, Policy [Policy Text Block]	New accounting pronouncements effective in the nine September 30, 2017 Improvement to Employee Share-Based Payment Accounting In March 2016, 2016 09, no 1 2 December 15, 2016. not Interests Held through Related Parties that are under Common Control In October 2016, 2016 17, 810 December 15, 2016, not Simplifying the Measurement of Inventory In July 2015, 2015 11, 330. no December 15, 2016, not New accounting pronouncements effective in future periods Derivatives and Hedging In August 2017, 2017 12, December 15, 2018, Intangibles –Goodwill and Other In January 2017, 2017 04, 350 not 2 2 first first December 15, 2019. January 1, 2017. Compensation - Stock Compensation In May 2017, 2017 09, 718 718. 1 2 3 718 December 15, 2017. Business Combinations In January 2017, 2017 01, 805 not December 15, 2017, Statement of Cash Flows In November 2016, 2016 18, 230 December 15, 2017, Intra-Entity Transfers of Assets Other than Inventory In October 2016, 2016 16, not December 15, 2017, first 2017. Revenues from Contracts with Customers In May 2014, 2014 09, 606, 1 2 3 4 5 2014 09 December 15, 2017, no 2017 840, In March 2016, 2016 08, not December 15, 2017, no 2017 Leases In February 2016, 2016 02, 842. two 606. December 15, 2018, Recognition and Measurement of Financial Assets and Financial Liabilities In January 2016, 2016 01, December 15, 2017,

Note 1 - General and Basis of21

Note 1 - General and Basis of Presentation (Tables)	9 Months Ended
	Sep. 30, 2017
Notes Tables
Schedule of Error Corrections and Prior Period Adjustments [Table Text Block]	September 30, 2017 December 31, 2016 As originally reported Adjustments As Restated As originally reported Adjustments As Revised Deferred income tax liabilities $ 54,495 $ 23,419 $ 77,914 $ 35,382 $ 1,029 $ 36,411 Liability for unrecognized tax benefits 6,188 - 6,188 5,738 706 6,444 Total liabilities 1,239,812 23,419 1,263,231 1,286,790 1,735 1,288,525 Retained earnings 289,561 (23,027 ) 266,534 216,644 (1,292 ) 215,352 Accumulated other comprehensive loss (5,634 ) (392 ) (6,026 ) (7,732 ) (443 ) (8,175 ) Total stockholders’ equity attributable to the Company stockholders 1,179,983 (23,419 ) 1,156,564 1,078,425 (1,735 ) 1,076,690 Total equity 1,257,445 (23,419 ) 1,234,026 1,170,007 (1,735 ) 1,168,272 Three months ended September 30, 2017 Nine months ended September 30, 2017 As originally reported Adjustments As Restated As originally reported Adjustments As Restated Income tax provision $ (11,003 ) $ 4,779 $ (6,224 ) $ (28,258 ) $ (21,735 ) $ (49,993 ) Income from continuing operations 22,780 4,779 27,559 100,757 (21,735 ) 79,022 Net income attributable to the Company’s stockholders 19,181 4,779 23,960 89,529 (21,735 ) 67,794 Loss in respect of derivative instruments designated for cash flow hedge 20 - 20 62 51 113 Comprehensive income 24,405 4,779 29,184 103,577 (21,684 ) 81,893 Comprehensive income attributable to the Company’s stockholders 20,399 4,779 25,178 91,627 (21,684 ) 69,943 Net income per share attributable to the Company’s stockholders Basic: $ 0.38 $ 0.10 $ 0.48 $ 1.79 $ (0.43 ) $ 1.36 Diluted: $ 0.38 $ 0.09 $ 0.47 $ 1.77 $ (0.43 ) $ 1.34 Three months ended September 30, 2016 Nine months ended September 30, 2016 As originally reported Adjustments As Revised As originally reported Adjustments As Revised Income tax provision $ (11,988 ) $ (121 ) $ (12,109 ) $ (29,387 ) $ (316 ) $ (29,703 ) Income from continuing operations 14,406 (121 ) 14,285 70,284 (316 ) 69,968 Net income attributable to the Company’s stockholders 12,080 (121 ) 11,959 65,700 (316 ) 65,384 Loss in respect of derivative instruments designated for cash flow hedge 22 13 35 65 40 105 Comprehensive income 15,741 (108 ) 15,633 66,448 (276 ) 66,172 Comprehensive income attributable to the Company’s stockholders 13,415 (108 ) 13,307 61,864 (276 ) 61,588 Net income per share attributable to the Company’s stockholders Basic: $ 0.24 $ - $ 0.24 $ 1.33 $ (0.01 ) $ 1.32 Diluted: $ 0.24 $ - $ 0.24 $ 1.31 $ - $ 1.31 As originally reported Adjustments As Revised Balances as of December 31, 2015: Retained earnings $ 148,396 $ 3,930 $ 152,326 Accumulated other comprehensive loss (7,667 ) (497 ) (8,164 ) Total stockholders’ equity attributable to the Company’s stockholders 990,001 3,433 993,434 Total equity 1,083,874 3,433 1,087,307 Net income for the nine months ended September 30, 2016 70,090 (316 ) 69,774 Net income attributable to the Company’s stockholders for the nine months ended September 30, 2016 65,700 (316 ) 65,384 Loss in respect of derivative instruments designated for cash flow hedge for the nine months ended September 30, 2016 65 40 105 Balances as of September 30, 2016: Retained earnings 191,627 3,614 195,241 Accumulated other comprehensive loss (11,503 ) (457 ) (11,960 ) Total stockholders’ equity attributable to the Company’s stockholders 1,040,029 3,157 1,043,186 Total equity 1,135,942 3,157 1,139,099 As originally reported Adjustments As Restated Balances as of December 31, 2016: Retained earnings $ 216,644 $ (1,292 ) $ 215,352 Accumulated other comprehensive loss (7,732 ) (443 ) (8,175 ) Total stockholders’ equity attributable to the Company’s stockholders 1,078,425 (1,735 ) 1,076,690 Total equity 1,170,007 (1,735 ) 1,168,272 Net income for the nine months ended September 30, 2017 99,683 (21,735 ) 77,948 Net income attributable to the Company’s stockholders for the nine months ended September 30, 2017 89,529 (21,735 ) 67,794 Loss in respect of derivative instruments designated for cash flow hedge for the nine months ended September 30, 2017 62 51 113 Balances as of September 30, 2017: Retained earnings 289,561 (23,027 ) 266,534 Accumulated other comprehensive loss (5,634 ) (392 ) (6,026 ) Total stockholders’ equity attributable to the Company’s stockholders 1,179,983 (23,419 ) 1,156,564 Total equity 1,257,445 (23,419 ) 1,234,026 Nine months ended September 30, 2017 Nine months ended September 30, 2016 As originally reported Adjustments As Restated As originally reported Adjustments As Revised Cash flows from operating activities: Net income $ 100,757 $ (21,735 ) $ 79,022 $ 70,284 $ (316 ) $ 69,968 Deferred income tax provision 16,506 21,617 38,123 20,742 - 20,742 Liability for unrecognized tax benefits 450 118 568 (125 ) 316 191 Net cash provided by operating activities 166,533 - 166,533 158,027 - 158,027

Note 3 - Inventories (Tables)

Note 3 - Inventories (Tables)	9 Months Ended
	Sep. 30, 2017
Notes Tables
Schedule of Inventory, Current [Table Text Block]	September 30, December 31, 2017 2016 (Dollars in thousands) Raw materials and purchased parts for assembly $ 9,461 $ 5,429 Self-manufactured assembly parts and finished products 9,224 6,571 Total $ 18,685 $ 12,000

Note 4 - Unconsolidated Inves23

Note 4 - Unconsolidated Investments (Tables)	9 Months Ended
	Sep. 30, 2017
Notes Tables
Equity Method Investments [Table Text Block]	September 30, December 31, 2017 2016 (Dollars in thousands) Sarulla $ 25,367 $ (11,081 )

Note 5 - Fair Value of Financ24

Note 5 - Fair Value of Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2017
Notes Tables
Fair Value, by Balance Sheet Grouping [Table Text Block]	September 30, 2017 Fair Value Carrying Value at September 30, 2017 Total Level 1 Level 2 Level 3 (Dollars in thousands) Assets: Current assets: Cash equivalents (including restricted cash accounts) $ 13,497 $ 13,497 $ 13,497 $ — $ — Derivatives: Put options on gas price (3) 61 61 — 61 — Contingent receivable (1) 1,125 1,125 — — 1,125 Currency forward contracts (2) 486 486 — 486 — Liabilities: Current and long-term liabilities: Derivatives: Contingent payables (1) $ (25,913 ) $ (25,913 ) $ — $ — $ (25,913 ) Warrants (1) (3,889 ) (3,889 ) (3,889 ) Currency forward contracts (2) (203 ) (203 ) — (203 ) — $ (14,836 ) $ (14,836 ) $ 13,497 $ 344 $ (28,677 ) December 31, 2016 Fair Value Carrying Value at December 31, 2016 Total Level 1 Level 2 Level 3 (Dollars in thousands) Assets Current assets: Cash equivalents (including restricted cash accounts) $ 14,922 $ 14,922 $ 14,922 $ — $ — Derivatives: Contingent receivable (1) 1,443 1,443 — — 1,443 Liabilities: Current and long-term liabilities: Derivatives: Contingent payables (1) $ (11,581 ) $ (11,581 ) $ — $ — $ (11,581 ) Warrants (1) (3,429 ) (3,429 ) — — (3,429 ) Currency forward contracts (2) (481 ) (481 ) — (481 ) — $ 874 $ 874 $ 14,922 $ (481 ) $ (13,567 )
Derivative Instruments, Gain (Loss) [Table Text Block]	Amount of recognized gain (loss) Derivatives not designated Location of recognized Three Months Ended September 30, Nine Months Ended September 30, as hedging instruments gain (loss) 2017 2016 2017 2016 Put options on natural gas price Derivatives and foreign currency transaction gains (losses) $ (121 ) $ — $ (362 ) $ — Call options on natural gas price Derivatives and foreign currency transaction gains (losses) — 32 — (1,114 ) Call and put options on oil price Derivatives and foreign currency transaction gains (losses) — 230 — (1,312 ) Contingent considerations Derivative and foreign currency transaction gains (losses) (19 ) — (114 ) — Currency forward contracts Derivative and foreign currency and transaction gains (losses) (887 ) 689 2,832 1,154 $ (1,027 ) $ 951 $ 2,356 $ (1,272 )
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]	Fair Value Carrying Amount September 30, 2017 December 31, 2016 September 30, 2017 December 31, 2016 (Dollars in millions) (Dollars in millions) Olkaria III Loan - DEG $ — $ 16.3 $ — $ 15.8 Olkaria III Loan - OPIC 242.9 253.4 233.1 246.6 Olkaria IV Loan - DEG 2 52.4 50.9 50.0 50.0 Amatitlan Loan 34.2 37.3 34.1 36.8 Senior Secured Notes: Ormat Funding Corp. ("OFC") — 17.0 — 17.0 OrCal Geothermal Inc. ("OrCal") 34.1 37.4 32.1 35.2 OFC 2 LLC ("OFC 2") 242.5 249.0 236.6 247.2 Don A. Campbell 1 ("DAC1") 88.2 88.9 89.6 92.4 Senior Unsecured Bonds 201.4 200.1 204.3 204.3 Other long-term debt 7.3 10.4 8.0 11.2
Fair Value, Liabilities Measured on Recurring and Nonrecurring Basis [Table Text Block]	Level 1 Level 2 Level 3 Total (Dollars in millions) Olkaria III - OPIC $ — $ — $ 242.9 $ 242.9 Olkaria IV - DEG 2 — — 52.4 52.4 Amatitlan Loan — 34.2 — 34.2 Senior Secured Notes: OrCal — — 34.1 34.1 OFC 2 — — 242.5 242.5 Don A. Campbell 1 — — 88.2 88.2 Senior Unsecured Bonds — — 201.4 201.4 Other long-term debt — — 7.3 7.3 Revolving lines of credit — 33.9 — 33.9 Deposits 15.2 — — 15.2 Level 1 Level 2 Level 3 Total (Dollars in millions) Olkaria III Loan - DEG $ — $ — $ 16.3 $ 16.3 Olkaria III Loan - OPIC — — 253.4 253.4 Olkaria IV - DEG 2 — — 50.9 50.9 Amatitlan Loan — 37.3 — 37.3 Senior Secured Notes: OFC — 17.0 — 17.0 OrCal — — 37.4 37.4 OFC 2 — — 249.0 249.0 Don A. Campbell 1 — — 88.9 88.9 Senior Unsecured Bonds — — 200.1 200.1 Other long-term debt — 3.3 7.1 10.4 Deposits 14.4 — — 14.4

Note 7 - Interest Expense, Net

Note 7 - Interest Expense, Net (Tables)	9 Months Ended
	Sep. 30, 2017
Notes Tables
Schedule of Other Nonoperating Expense, by Component [Table Text Block]	Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 Interest related to sale of tax benefits $ 1,607 $ 2,565 $ 5,468 $ 6,269 Interest expense 13,299 15,726 41,620 47,214 Less — amount capitalized (3,214 ) (1,154 ) (5,933 ) (1,922 ) $ 11,692 $ 17,137 $ 41,155 $ 51,561

Note 8 - Earnings Per Share (Ta

Note 8 - Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2017
Notes Tables
Schedule of Weighted Average Number of Shares [Table Text Block]	Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 Weighted average number of shares used in computation of basic earnings per share 50,367 49,599 49,942 49,410 Add: Additional shares from the assumed exercise of employee stock options 500 690 727 687 Weighted average number of shares used in computation of diluted earnings per share 50,867 50,289 50,669 50,097

Note 9 - Business Segments (Tab

Note 9 - Business Segments (Tables)	9 Months Ended
	Sep. 30, 2017
Notes Tables
Schedule of Segment Reporting Information, by Segment [Table Text Block]	Electricity Product Consolidated (Dollars in thousands) Three Months Ended September 30, 2017: Net revenue from external customers $ 112,273 $ 44,912 $ 157,185 Intersegment revenue — 28,248 28,248 Operating income 36,205 7,765 43,970 Segment assets at period end (1) 2,371,855 131,883 2,503,738 Three Months Ended September 30, 2016: Net revenue from external customers $ 109,795 $ 74,822 184,617 Intersegment revenue — 14,835 14,835 Operating income 23,903 24,320 48,223 Segment assets at period end 2,137,845 141,426 2,279,271 Nine Months Ended September 30, 2017: Net revenues from external customers $ 339,826 $ 186,621 526,447 Intersegment revenues — 61,026 61,026 Operating income 113,220 43,398 156,618 Segment assets at period end (1) 2,371,855 131,883 2,503,738 Nine Months Ended September 30, 2016: Net revenues from external customers $ 321,664 $ 174,408 496,072 Intersegment revenues — 36,042 36,042 Operating income 91,502 59,151 150,653 Segment assets at period end 2,137,845 141,426 2,279,271
Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block]	Three Months Ended September 30, Nine Months Ended September 30, 2017 2016 2017 2016 Revenue: Total segment revenue $ 157,185 $ 184,617 $ 526,447 $ 496,072 Intersegment revenue 28,248 14,835 61,026 36,042 Elimination of intersegment revenue (28,248 ) (14,835 ) (61,026 ) (36,042 ) Total consolidated revenue $ 157,185 $ 184,617 $ 526,447 $ 496,072 Operating income: Operating income $ 43,970 $ 48,223 $ 156,618 $ 150,653 Interest income 255 266 861 831 Interest expense, net (11,692 ) (17,137 ) (41,155 ) (51,561 ) Derivatives and foreign currency transaction gains (losses) (1,001 ) (222 ) 2,040 (2,592 ) Income attributable to sale of tax benefits 3,506 3,463 14,019 12,380 Other non-operating expense, net (1,592 ) (5,546 ) (1,678 ) (5,306 ) Total consolidated income before income taxes and equity in losses of investees $ 33,446 $ 29,047 $ 130,705 $ 104,405

Note 1 - General and Basis of28

Note 1 - General and Basis of Presentation (Details Textual) shares in Millions	Sep. 26, 2017MWh	Jul. 26, 2017shares	Jul. 10, 2017USD ($)	Mar. 15, 2017USD ($)	Dec. 29, 2016USD ($)	Sep. 30, 2017USD ($)	Sep. 30, 2017USD ($)	Jun. 30, 2017MWh$ / MWh	Sep. 30, 2016USD ($)	Sep. 30, 2017USD ($)	Sep. 30, 2016USD ($)	Dec. 31, 2016USD ($)	Jan. 01, 2016USD ($)	Dec. 31, 2015USD ($)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total							$ 27,559,000		$ 14,285,000	$ 79,022,000	$ 69,968,000
Income Tax Expense (Benefit), Total							6,224,000		12,109,000	49,993,000	29,703,000
Retained Earnings (Accumulated Deficit), Ending Balance						$ 266,534,000	266,534,000		195,241,000	266,534,000	195,241,000	$ 215,352,000		$ 152,326,000
Repayments of Secured Debt										14,270,000	6,815,000
Repayments of Long-term Debt, Total										55,226,000	40,997,000
Payments to Acquire Additional Interest in Subsidiaries										2,357,000
Goodwill, Ending Balance						20,667,000	20,667,000			20,667,000		6,650,000
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax							2,000		2,000	5,000	7,000
Interest Expense, Total							11,692,000		17,137,000	41,155,000	51,561,000
Accumulated Other Comprehensive Income (Loss), Net of Tax, Total						(6,026,000)	(6,026,000)		(11,960,000)	(6,026,000)	(11,960,000)	(8,175,000)		(8,164,000)
Exploration Abandonment and Impairment Expense							0		1,294,000	0	2,714,000
Cash, Cash Equivalents, and Short-term Investments, Total						77,212,000	77,212,000		90,066,000	77,212,000	90,066,000	230,214,000		185,919,000
Accounts Receivable, Net, Current, Total						98,384,000	98,384,000			98,384,000		$ 80,807,000
Provision for Doubtful Accounts										0
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest, Total							$ 29,184,000		$ 15,633,000	$ 81,893,000	$ 66,172,000
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Primary Customers [Member]
Concentration Risk, Percentage										48.00%		60.00%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Sierra Pacific Power Company And Nevada Power Company [Member]
Concentration Risk, Percentage							16.30%		14.40%	17.40%	18.60%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Kenya Power and Lighting Co LTD [Member]
Concentration Risk, Percentage							17.60%		15.10%	15.70%	16.40%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Southern California Public Power Authority [Member]
Concentration Risk, Percentage							9.10%		7.70%	8.90%	9.90%
Sales Revenue, Net [Member] | Customer Concentration Risk [Member] | Hyundai (Sarulla Goethermal Power Project) [Member]
Concentration Risk, Percentage							0.90%		24.00%	4.70%	14.00%
UNITED STATES
Cash, Cash Equivalents, and Short-term Investments, Total						23,900,000	$ 23,900,000			$ 23,900,000		$ 72,500,000
Foreign Countries [Member]
Cash, Cash Equivalents, and Short-term Investments, Total						56,000,000	56,000,000			56,000,000		166,200,000
Accounts Receivable, Net, Current, Total						67,500,000	67,500,000			67,500,000		53,300,000
Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Total						(600,000)	(600,000)			(600,000)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Income Tax Expense (Benefit), Total							(4,000)		$ (1,000)	(4,000)	$ (4,000)
Interest Expense, Total							(6,000)		(3,000)	(9,000)	(11,000)
Viridity Energy, Inc. [Member]
Business Combination, Consideration Transferred, Total					$ 35,300,000
Business Combination, Contingent Consideration, Liability, Total				$ 12,800,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total				$ 34,700,000
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life				17 years
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Working Capital				$ 400,000
Goodwill, Ending Balance				$ 13,900,000
Maximum [Member]
Cash, FDIC Insured Amount						250,000	250,000			250,000		250,000
Ormat Nevada ORTP LLC [Member] | ORTP Transaction [Member]
Payments to Acquire Additional Interest in Subsidiaries			$ 2,400,000
Ormat Funding Corp [Member]
Repayments of Secured Debt						14,300,000
Gain (Loss) on Extinguishment of Debt, Total						1,500,000
Amortization of Debt Issuance Costs						200,000
DEG [Member]
Gain (Loss) on Extinguishment of Debt, Total						500,000
Amortization of Debt Issuance Costs						400,000
Repayments of Long-term Debt, Total						11,800,000
ORIX Corporation [Member]
Number of Shares Purchased by Investor | shares		11
Percentage Ownership in Company Purchased by Investor		22.00%
Voting Rights, Number of Directors Designated		3
Number of Directors after Acquisition Transaction		9
Voting Rights, Effective Rate Cap		25.00%
Southern California Public Power Authority [Member] | Ormat Nevada ORTP LLC [Member] | Minimum [Member]
Expected Power Generating Capacity | MWh								135
Southern California Public Power Authority [Member] | Ormat Nevada ORTP LLC [Member] | Maximum [Member]
Expected Power Generating Capacity | MWh								185
Southern California Public Power Authority [Member] | ONGP, LLC [Member]
Expected Power Generating Capacity | MWh								150
Power Plant Usage Agreement Term								5 years
Power Purchase Agreements Term								26 years
Power Purchase Agreements, Number of Power Plants Portfolio								9
Power Purchase Agreements, Fixed Price Per MWh | $ / MWh								75.5
Geotermica Platanares [Member]
Expected Power Generating Capacity | MWh	35
Power Plant Usage Agreement Term	15 years
Geotermica Platanares [Member] | ENEE [Member]
Power Purchase Agreements Term	30 years
Restatement Adjustment [Member]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total							4,800,000		100,000	(21,735,000)	(316,000)
Income Tax Expense (Benefit), Total							(4,779,000)		121,000	21,735,000	316,000
Retained Earnings (Accumulated Deficit), Ending Balance						(23,027,000)	(23,027,000)		3,614,000	(23,027,000)	3,614,000	(1,292,000)	$ 3,900,000	3,930,000
Accumulated Other Comprehensive Income (Loss), Net of Tax, Total						$ (392,000)	(392,000)		(457,000)	(392,000)	(457,000)	$ (443,000)		$ (497,000)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest, Total							$ 4,779,000		$ (108,000)	$ (21,684,000)	$ (276,000)

Note 1 - General and Basis of29

Note 1 - General and Basis of Presentation - Effect of Revision on Balance Sheet Line Items (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Jan. 01, 2016	Dec. 31, 2015
Deferred income tax liabilities	$ 77,914,000		$ 77,914,000		$ 36,411,000
Liability for unrecognized tax benefits	6,188,000		6,188,000		6,444,000
Total liabilities	1,263,231,000		1,263,231,000		1,288,525,000
Retained Earnings (Accumulated Deficit), Ending Balance	266,534,000	$ 195,241,000	266,534,000	$ 195,241,000	215,352,000		$ 152,326,000
Accumulated Other Comprehensive Income (Loss), Net of Tax, Total	(6,026,000)	(11,960,000)	(6,026,000)	(11,960,000)	(8,175,000)		(8,164,000)
Total stockholders’ equity attributable to the Company stockholders	1,156,564,000	1,043,186,000	1,156,564,000	1,043,186,000	1,076,690,000		993,434,000
Total equity	1,234,026,000	1,139,099,000	1,234,026,000	1,139,099,000	1,168,272,000		1,087,307,000
Income tax provision	(6,224,000)	(12,109,000)	(49,993,000)	(29,703,000)
Income from continuing operations	27,559,000	14,285,000	79,022,000	69,968,000
Net income attributable to the Company’s stockholders	23,960,000	11,959,000	67,794,000	65,384,000
Loss in respect of derivative instruments designated for cash flow hedge	20,000	35,000	113,000	105,000
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest, Total	29,184,000	15,633,000	81,893,000	66,172,000
Comprehensive income attributable to the Company’s stockholders	$ 25,178,000	$ 13,307,000	$ 69,943,000	$ 61,588,000
Basic: (in dollars per share)	$ 0.48	$ 0.24	$ 1.36	$ 1.32
Diluted: (in dollars per share)	$ 0.47	$ 0.24	$ 1.34	$ 1.31
Total equity	$ 1,234,026,000	$ 1,139,099,000	$ 1,234,026,000	$ 1,139,099,000	1,168,272,000		1,087,307,000
Net income			77,948,000	69,774,000
Loss in respect of derivative instruments designated for cash flow hedge	20,000	35,000	113,000	105,000
Net income	27,559,000	14,285,000	79,022,000	69,968,000
Deferred income tax provision			38,123,000	20,742,000
Liability for unrecognized tax benefits			568,000	191,000
Net cash provided by operating activities			166,533,000	158,027,000
Previously Reported [Member]
Deferred income tax liabilities	54,495,000		54,495,000		35,382,000
Liability for unrecognized tax benefits	6,188,000		6,188,000		5,738,000
Total liabilities	1,239,812,000		1,239,812,000		1,286,790,000
Retained Earnings (Accumulated Deficit), Ending Balance	289,561,000	191,627,000	289,561,000	191,627,000	216,644,000		148,396,000
Accumulated Other Comprehensive Income (Loss), Net of Tax, Total	(5,634,000)	(11,503,000)	(5,634,000)	(11,503,000)	(7,732,000)		(7,667,000)
Total stockholders’ equity attributable to the Company stockholders	1,179,983,000	1,040,029,000	1,179,983,000	1,040,029,000	1,078,425,000		990,001,000
Total equity	1,257,445,000	1,135,942,000	1,257,445,000	1,135,942,000	1,170,007,000		1,083,874,000
Income tax provision	(11,003,000)	(11,988,000)	(28,258,000)	(29,387,000)
Income from continuing operations	22,780,000	14,406,000	100,757,000	70,284,000
Net income attributable to the Company’s stockholders	19,181,000	12,080,000	89,529,000	65,700,000
Loss in respect of derivative instruments designated for cash flow hedge	20,000	22,000	62,000	65,000
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest, Total	24,405,000	15,741,000	103,577,000	66,448,000
Comprehensive income attributable to the Company’s stockholders	$ 20,399,000	$ 13,415,000	$ 91,627,000	$ 61,864,000
Basic: (in dollars per share)	$ 0.38	$ 0.24	$ 1.79	$ 1.33
Diluted: (in dollars per share)	$ 0.38	$ 0.24	$ 1.77	$ 1.31
Total equity	$ 1,257,445,000	$ 1,135,942,000	$ 1,257,445,000	$ 1,135,942,000	1,170,007,000		1,083,874,000
Net income			99,683,000	70,090,000
Loss in respect of derivative instruments designated for cash flow hedge	20,000	22,000	62,000	65,000
Net income			100,757,000	70,284,000
Deferred income tax provision			16,506,000	20,742,000
Liability for unrecognized tax benefits			450,000	(125,000)
Net cash provided by operating activities			166,533,000	158,027,000
Restatement Adjustment [Member]
Deferred income tax liabilities	23,419,000		23,419,000		1,029,000
Liability for unrecognized tax benefits					706,000
Total liabilities	23,419,000		23,419,000		1,735,000
Retained Earnings (Accumulated Deficit), Ending Balance	(23,027,000)	3,614,000	(23,027,000)	3,614,000	(1,292,000)	$ 3,900,000	3,930,000
Accumulated Other Comprehensive Income (Loss), Net of Tax, Total	(392,000)	(457,000)	(392,000)	(457,000)	(443,000)		(497,000)
Total stockholders’ equity attributable to the Company stockholders	(23,419,000)	3,157,000	(23,419,000)	3,157,000	(1,735,000)		3,433,000
Total equity	(23,419,000)	3,157,000	(23,419,000)	3,157,000	(1,735,000)		3,433,000
Income tax provision	4,779,000	(121,000)	(21,735,000)	(316,000)
Income from continuing operations	4,779,000	(121,000)	(21,735,000)	(316,000)
Net income attributable to the Company’s stockholders	4,779,000	(121,000)	(21,735,000)	(316,000)
Loss in respect of derivative instruments designated for cash flow hedge		13,000	51,000	40,000
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest, Total	4,779,000	(108,000)	(21,684,000)	(276,000)
Comprehensive income attributable to the Company’s stockholders	$ 4,779,000	$ (108,000)	$ (21,684,000)	$ (276,000)
Basic: (in dollars per share)	$ 0.10		$ (0.43)	$ (0.01)
Diluted: (in dollars per share)	$ 0.09		$ (0.43)
Total equity	$ (23,419,000)	$ 3,157,000	$ (23,419,000)	$ 3,157,000	$ (1,735,000)		$ 3,433,000
Net income			(21,735,000)	(316,000)
Loss in respect of derivative instruments designated for cash flow hedge		13,000	51,000	40,000
Net income	$ 4,800,000	$ 100,000	(21,735,000)	(316,000)
Deferred income tax provision			21,617,000
Liability for unrecognized tax benefits			118,000	316,000
Net cash provided by operating activities

Note 3 - Inventories - Inventor

Note 3 - Inventories - Inventories, Current (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Raw materials and purchased parts for assembly	$ 9,461	$ 5,429
Self-manufactured assembly parts and finished products	9,224	6,571
Total	$ 18,685	$ 12,000

Note 4 - Unconsolidated Inves31

Note 4 - Unconsolidated Investments (Details Textual) $ in Thousands	Jun. 04, 2014USD ($)	Sep. 30, 2017USD ($)	Sep. 30, 2016USD ($)	Sep. 30, 2017USD ($)MWh	Sep. 30, 2016USD ($)	Dec. 31, 2014USD ($)	May 23, 2014USD ($)	May 16, 2014USD ($)
Number of Commercial Lenders in Funding Consortium								6
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax		$ 618	$ 1,337	$ 271	$ (3,829)
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total		$ 27,559	14,285	$ 79,022	69,968
Intersegment Eliminations [Member]
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest, Total						$ 14,100
Sarulla [Member] | Lenders Consortium [Member]
Senior Notes, Total								$ 1,170,000
Sarulla [Member]
Jointly Owned Utility Plant, Proportionate Ownership Share		12.75%		12.75%
Expected Power Generating Capacity | MWh				330
Power Plant Usage Agreement Term				30 years
Number of Phases of Construction				3
Power Utilization | MWh				110
Percentage of Required Production Capacity		100.00%		100.00%
Percentage of Required Injection Capacity		85.00%		85.00%
Supply Commitment, Remaining Minimum Amount Committed						$ 255,600
Payments to Acquire Projects		$ 10,500		$ 37,900
Accumulated Cash Contributions to Acquire Projects		49,800		49,800
Sarulla [Member] | Interest Rate Swap [Member]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax		600	1,300	(300)	3,800
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax, Ending Balance		5,600		5,600
Sarulla [Member] | Interest Rate Swap [Member] | Sarulla Project Company [Member]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax		$ 4,800	$ 10,500	$ 2,100	$ (30,000)
Sarulla [Member] | Lenders Consortium [Member] | Interest Rate Swap [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate	3.4565%
Sarulla [Member] | Lenders Consortium [Member] | Subject to Fixed Interest Rate [Member]
Senior Notes, Total							$ 100,000
Sarulla [Member] | Lenders Consortium [Member] | Subject to Fixed LIBOR Interest Rate [Member]
Senior Notes, Total							$ 1,070,000
Sarulla [Member] | Lenders Consortium [Member] | Subject to Fixed LIBOR Interest Rate [Member] | Interest Rate Swap [Member]
Senior Notes, Total	$ 960,000

Note 4 - Unconsolidated Inves32

Note 4 - Unconsolidated Investments - Unconsolidated Investments Mainly in Power Plants (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Sarulla	$ (6,481)	$ (4,772)
Sarulla [Member]
Sarulla	$ 25,367	$ (11,081)

Note 5 - Fair Value of Financ33

Note 5 - Fair Value of Financial Instruments (Details Textual) BTU in Millions, $ in Millions	Jan. 12, 2017USD ($)BTU$ / item	Feb. 24, 2016USD ($)Boe$ / item	Feb. 02, 2016USD ($)BTU$ / item	Mar. 31, 2016Boe$ / item	Feb. 28, 2016$ / item
Derivative, Number of Options Rolled				2
Henry Hub Natural Gas Future ("NG") Contracts [Member] | Put Option [Member]
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU	4.1
Derivative, Price Risk Option Strike Price	3
Payments for Derivative Instrument, Investing Activities | $	$ 0.7
Henry Hub Natural Gas Future ("NG") Contracts [Member] | Call Option [Member]
Derivative, Nonmonetary Notional Amount, Energy Measure | BTU			4.1
Derivative, Price Risk Option Strike Price			2
Proceeds from Derivative Instrument, Investing Activities | $			$ 1.9
Brent Oil Future Contracts [Member]
Derivative, Nonmonetary Notional Amount, Energy Measure | Boe		185,000
Brent Oil Future Contracts [Member] | Minimum [Member]
Derivative, Price Risk Option Strike Price		32.8
Brent Oil Future Contracts [Member] | Maximum [Member]
Derivative, Price Risk Option Strike Price		35.5
Brent Oil Future Contracts [Member] | Call Option [Member]
Proceeds from Derivative Instrument, Investing Activities | $		$ 1.1
Rolled Two Existing Options [Member]
Derivative, Nonmonetary Notional Amount, Energy Measure | Boe				31,800
Rolled Two Existing Options [Member] | Minimum [Member]
Derivative, Price Risk Option Strike Price				41
Rolled Two Existing Options [Member] | Maximum [Member]
Derivative, Price Risk Option Strike Price				42.5
Before Rolling Two Existing Options [Member] | Minimum [Member]
Derivative, Price Risk Option Strike Price					32.8
Before Rolling Two Existing Options [Member] | Maximum [Member]
Derivative, Price Risk Option Strike Price					33.5
Short Risk Reversal Transactions, Rolling Existing Call Option 1 [Member]
Derivative, Nonmonetary Notional Amount, Energy Measure | Boe				16,500
Short Risk Reversal Transactions, Rolling Existing Call Option 1 [Member] | Minimum [Member]
Derivative, Price Risk Option Strike Price				28.5
Short Risk Reversal Transactions, Rolling Existing Call Option 1 [Member] | Maximum [Member]
Derivative, Price Risk Option Strike Price				37.5
Short Risk Reversal Transactions, Rolling Existing Call Option 2 [Member]
Derivative, Nonmonetary Notional Amount, Energy Measure | Boe				17,000
Short Risk Reversal Transactions, Rolling Existing Call Option 2 [Member] | Minimum [Member]
Derivative, Price Risk Option Strike Price				28
Short Risk Reversal Transactions, Rolling Existing Call Option 2 [Member] | Maximum [Member]
Derivative, Price Risk Option Strike Price				38.5

Note 5 - Fair Value of Financ34

Note 5 - Fair Value of Financial Instruments - Financial Assets and Liabilities at Fair Value (Details) - USD ($) $ in Thousands		Sep. 30, 2017	Dec. 31, 2016
Reported Value Measurement [Member]
Cash equivalents (including restricted cash accounts)		$ 13,497	$ 14,922
		(14,836)	874
Reported Value Measurement [Member] | Put Options on Natural Gas Price [Member]
Derivative Asset, Current	[1]	61
Reported Value Measurement [Member] | Contingent Receivable [Member]
Derivative Asset, Current	[2]	1,125	1,443
Reported Value Measurement [Member] | Contingent Payable [Member]
Derivative Liability, Current	[2]	(25,913)	(11,581)
Reported Value Measurement [Member] | Currency Forward Contracts [Member]
Derivative Asset, Current	[3]	486
Derivative Liability, Current	[3]	(203)	(481)
Reported Value Measurement [Member] | Warrant [Member]
Derivative Liability, Current	[2]	(3,889)	(3,429)
Estimate of Fair Value Measurement [Member]
Cash equivalents (including restricted cash accounts)		13,497	14,922
		(14,836)	874
Estimate of Fair Value Measurement [Member] | Put Options on Natural Gas Price [Member]
Derivative Asset, Current	[1]	61
Estimate of Fair Value Measurement [Member] | Contingent Receivable [Member]
Derivative Asset, Current	[2]	1,125	1,443
Estimate of Fair Value Measurement [Member] | Contingent Payable [Member]
Derivative Liability, Current	[2]	(25,913)	(11,581)
Estimate of Fair Value Measurement [Member] | Currency Forward Contracts [Member]
Derivative Asset, Current	[3]	486
Derivative Liability, Current	[3]	(203)	(481)
Estimate of Fair Value Measurement [Member] | Warrant [Member]
Derivative Liability, Current	[2]	(3,889)	(3,429)
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Cash equivalents (including restricted cash accounts)		13,497	14,922
		13,497	14,922
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Put Options on Natural Gas Price [Member]
Derivative Asset, Current	[1]
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Contingent Receivable [Member]
Derivative Asset, Current	[2]
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Contingent Payable [Member]
Derivative Liability, Current	[2]
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Currency Forward Contracts [Member]
Derivative Asset, Current	[3]
Derivative Liability, Current	[3]
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | Warrant [Member]
Derivative Liability, Current	[2]
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Cash equivalents (including restricted cash accounts)
		344	(481)
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Put Options on Natural Gas Price [Member]
Derivative Asset, Current	[1]	61
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Contingent Receivable [Member]
Derivative Asset, Current	[2]
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Contingent Payable [Member]
Derivative Liability, Current	[2]
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Currency Forward Contracts [Member]
Derivative Asset, Current	[3]	486
Derivative Liability, Current	[3]	(203)	(481)
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | Warrant [Member]
Derivative Liability, Current	[2]
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Cash equivalents (including restricted cash accounts)
		(28,677)	(13,567)
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Put Options on Natural Gas Price [Member]
Derivative Asset, Current	[1]
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Contingent Receivable [Member]
Derivative Asset, Current	[2]	1,125	1,443
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Contingent Payable [Member]
Derivative Liability, Current	[2]	(25,913)	(11,581)
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Currency Forward Contracts [Member]
Derivative Asset, Current	[3]
Derivative Liability, Current	[3]
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Warrant [Member]
Derivative Liability, Current	[2]	$ (3,889)	$ (3,429)
[1]	These amounts relate to natural gas put options, valued primarily based on observable inputs, including spot prices on related commodity indices, and are included within Prepaid expenses and other on September 30, 2017 in the consolidated balance sheets with the corresponding gain or loss being recognized within Derivatives and foreign currency transaction gains (losses) in the consolidated statement of operations and comprehensive income.
[2]	These amounts relate to contingent receivables and payables relating to the Viridity acquisition and 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 September 30, 2017 and within Prepaid expenses and other and Other long-term liabilities on December 31, 2016 in the consolidated balance sheets with the corresponding gain or loss being recognized within Derivatives and foreign currency transaction gains (losses) in the consolidated statement of operations and comprehensive income.
[3]	These amounts relate to currency forward contracts valued primarily based on observable inputs, including forward and spot prices for currencies, net of contracted rates and then multiplied by notional amounts, and are included within Prepaid expenses and other and Accounts payable and accrued expenses on September 30, 2017 and December 31, 2016, in the consolidated balance sheet with the corresponding gain or loss being recognized within Derivatives and foreign currency transaction gains (losses) in the consolidated statement of operations and comprehensive income.

Note 5 - Fair Value of Financ35

Note 5 - Fair Value of Financial Instruments - Amounts of Gain (Loss) Recognized in Condensed Consolidated Statements on Derivative Instruments Not Designated as Hedges (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Amount of gain (loss) recognized	$ (1,027)	$ 951	$ 2,356	$ (1,272)
Foreign Currency Gain (Loss) [Member] | Put Options on Natural Gas Price [Member]
Amount of gain (loss) recognized	(121)		(362)
Foreign Currency Gain (Loss) [Member] | Call Option on Natural Gas Price [Member]
Amount of gain (loss) recognized		32		(1,114)
Foreign Currency Gain (Loss) [Member] | Call and Put Options on Oil Price [Member]
Amount of gain (loss) recognized		230		(1,312)
Foreign Currency Gain (Loss) [Member] | Contingent Considerations [Member]
Amount of gain (loss) recognized	(19)		(114)
Foreign Currency Gain (Loss) [Member] | Currency Forward Contracts [Member]
Amount of gain (loss) recognized	$ (887)	$ 689	$ 2,832	$ 1,154

Note 5 - Fair Value of Financ36

Note 5 - Fair Value of Financial Instruments - Fair Value of Long-term Debt Approximates Its Carrying Amount, Exceptions (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Estimate of Fair Value Measurement [Member]
Other long-term debt	$ 7.3	$ 10.4
Reported Value Measurement [Member]
Other long-term debt	8	11.2
Olkaria III DEG [Member]
Loans		16.3
Olkaria III DEG [Member] | Estimate of Fair Value Measurement [Member]
Loans		16.3
Olkaria III DEG [Member] | Reported Value Measurement [Member]
Loans		15.8
Olkaria III OPIC [Member]
Loans	242.9	253.4
Olkaria III OPIC [Member] | Estimate of Fair Value Measurement [Member]
Loans	242.9	253.4
Olkaria III OPIC [Member] | Reported Value Measurement [Member]
Loans	233.1	246.6
Olkaria IV Loan - DEG 2 [Member]
Loans	52.4	50.9
Olkaria IV Loan - DEG 2 [Member] | Estimate of Fair Value Measurement [Member]
Loans	52.4	50.9
Olkaria IV Loan - DEG 2 [Member] | Reported Value Measurement [Member]
Loans	50	50
Amatitlan Loan [Member]
Loans	34.2	37.3
Amatitlan Loan [Member] | Estimate of Fair Value Measurement [Member]
Loans	34.2	37.3
Amatitlan Loan [Member] | Reported Value Measurement [Member]
Loans	34.1	36.8
Ormat Funding Corp [Member]
Notes		17
Ormat Funding Corp [Member] | Estimate of Fair Value Measurement [Member]
Notes		17
Ormat Funding Corp [Member] | Reported Value Measurement [Member]
Notes		17
OrCal Geothermal Inc [Member]
Notes	34.1	37.4
OrCal Geothermal Inc [Member] | Estimate of Fair Value Measurement [Member]
Notes	34.1	37.4
OrCal Geothermal Inc [Member] | Reported Value Measurement [Member]
Notes	32.1	35.2
OFC Two Senior Secured Notes [Member]
Notes	242.5	249
OFC Two Senior Secured Notes [Member] | Estimate of Fair Value Measurement [Member]
Notes	242.5	249
OFC Two Senior Secured Notes [Member] | Reported Value Measurement [Member]
Notes	236.6	247.2
Don A. Campbell 1 ("DAC1") [Member]
Notes	88.2	88.9
Don A. Campbell 1 ("DAC1") [Member] | Estimate of Fair Value Measurement [Member]
Notes	88.2	88.9
Don A. Campbell 1 ("DAC1") [Member] | Reported Value Measurement [Member]
Notes	89.6	92.4
Senior Unsecured Bonds [Member]
Notes		200.1
Senior Unsecured Bonds	201.4
Senior Unsecured Bonds [Member] | Estimate of Fair Value Measurement [Member]
Senior Unsecured Bonds	201.4	200.1
Senior Unsecured Bonds [Member] | Reported Value Measurement [Member]
Senior Unsecured Bonds	$ 204.3	$ 204.3

Note 5 - Fair Value of Financ37

Note 5 - Fair Value of Financial Instruments - Fair Value of Financial Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Revolving lines of credit	$ 33.9
Deposits	15.2
Deposits		$ 14.4
Fair Value, Inputs, Level 1 [Member]
Revolving lines of credit
Deposits	15.2
Deposits		14.4
Fair Value, Inputs, Level 2 [Member]
Revolving lines of credit	33.9
Deposits
Deposits
Fair Value, Inputs, Level 3 [Member]
Revolving lines of credit
Deposits
Deposits
Olkaria III OPIC [Member]
Loans	242.9	253.4
Olkaria III OPIC [Member] | Fair Value, Inputs, Level 1 [Member]
Loans
Olkaria III OPIC [Member] | Fair Value, Inputs, Level 2 [Member]
Loans
Olkaria III OPIC [Member] | Fair Value, Inputs, Level 3 [Member]
Loans	242.9	253.4
Olkaria III DEG [Member]
Loans		16.3
Olkaria III DEG [Member] | Fair Value, Inputs, Level 1 [Member]
Loans
Olkaria III DEG [Member] | Fair Value, Inputs, Level 2 [Member]
Loans
Olkaria III DEG [Member] | Fair Value, Inputs, Level 3 [Member]
Loans		16.3
Olkaria IV Loan - DEG 2 [Member]
Loans	52.4	50.9
Olkaria IV Loan - DEG 2 [Member] | Fair Value, Inputs, Level 1 [Member]
Loans
Olkaria IV Loan - DEG 2 [Member] | Fair Value, Inputs, Level 2 [Member]
Loans
Olkaria IV Loan - DEG 2 [Member] | Fair Value, Inputs, Level 3 [Member]
Loans	52.4	50.9
Amatitlan Loan [Member]
Loans	34.2	37.3
Amatitlan Loan [Member] | Fair Value, Inputs, Level 1 [Member]
Loans
Amatitlan Loan [Member] | Fair Value, Inputs, Level 2 [Member]
Loans	34.2	37.3
Amatitlan Loan [Member] | Fair Value, Inputs, Level 3 [Member]
Loans
OrCal Geothermal Inc [Member]
Notes	34.1	37.4
OrCal Geothermal Inc [Member] | Fair Value, Inputs, Level 1 [Member]
Notes
OrCal Geothermal Inc [Member] | Fair Value, Inputs, Level 2 [Member]
Notes
OrCal Geothermal Inc [Member] | Fair Value, Inputs, Level 3 [Member]
Notes	34.1	37.4
OFC Two Senior Secured Notes [Member]
Notes	242.5	249
OFC Two Senior Secured Notes [Member] | Fair Value, Inputs, Level 1 [Member]
Notes
OFC Two Senior Secured Notes [Member] | Fair Value, Inputs, Level 2 [Member]
Notes
OFC Two Senior Secured Notes [Member] | Fair Value, Inputs, Level 3 [Member]
Notes	242.5	249
Ormat Funding Corp [Member]
Notes		17
Ormat Funding Corp [Member] | Fair Value, Inputs, Level 1 [Member]
Notes
Ormat Funding Corp [Member] | Fair Value, Inputs, Level 2 [Member]
Notes		17
Ormat Funding Corp [Member] | Fair Value, Inputs, Level 3 [Member]
Notes
Don A. Campbell 1 ("DAC1") [Member]
Notes	88.2	88.9
Don A. Campbell 1 ("DAC1") [Member] | Fair Value, Inputs, Level 1 [Member]
Notes
Don A. Campbell 1 ("DAC1") [Member] | Fair Value, Inputs, Level 2 [Member]
Notes
Don A. Campbell 1 ("DAC1") [Member] | Fair Value, Inputs, Level 3 [Member]
Notes	88.2	88.9
Senior Unsecured Bonds [Member]
Notes		200.1
Senior Unsecured Bonds	201.4
Senior Unsecured Bonds [Member] | Fair Value, Inputs, Level 1 [Member]
Notes
Senior Unsecured Bonds
Senior Unsecured Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Notes
Senior Unsecured Bonds
Senior Unsecured Bonds [Member] | Fair Value, Inputs, Level 3 [Member]
Notes		200.1
Senior Unsecured Bonds	201.4
Other Long-term Debt [Member]
Other long-term debt	7.3	10.4
Other Long-term Debt [Member] | Fair Value, Inputs, Level 1 [Member]
Other long-term debt
Other Long-term Debt [Member] | Fair Value, Inputs, Level 2 [Member]
Other long-term debt		3.3
Other Long-term Debt [Member] | Fair Value, Inputs, Level 3 [Member]
Other long-term debt	$ 7.3	$ 7.1

Note 6 - Stock-based Compensa38

Note 6 - Stock-based Compensation (Details Textual) - shares	1 Months Ended	12 Months Ended
	May 31, 2012	Dec. 31, 2004
2004 Stock Incentive Plan [Member] | Stock Options And Stock Appreciation Rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized		3,750,000
2004 Stock Incentive Plan [Member] | Stock Options And Stock Appreciation Rights [Member] | Share-based Compensation Award, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage		25.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		2 years
2004 Stock Incentive Plan [Member] | Stock Options And Stock Appreciation Rights [Member] | Share-based Compensation Award, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage		25.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		3 years
2004 Stock Incentive Plan [Member] | Stock Options And Stock Appreciation Rights [Member] | Share-based Compensation Award, Tranche Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage		50.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		4 years
2004 Stock Incentive Plan [Member] | Employee Stock Option [Member] | Non Employee Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period		1 year
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period		10 years
2012 Stock Incentive Plan [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	6 years
2012 Stock Incentive Plan [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period	10 years
2012 Stock Incentive Plan [Member] | Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	400,000
2012 Stock Incentive Plan [Member] | Stock Options And Stock Appreciation Rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	4,000,000
2012 Stock Incentive Plan [Member] | Stock Options And Stock Appreciation Rights [Member] | Share-based Compensation Award, Tranche One [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	25.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	2 years
2012 Stock Incentive Plan [Member] | Stock Options And Stock Appreciation Rights [Member] | Share-based Compensation Award, Tranche Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	25.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	3 years
2012 Stock Incentive Plan [Member] | Stock Options And Stock Appreciation Rights [Member] | Share-based Compensation Award, Tranche Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage	50.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	4 years
2012 Stock Incentive Plan [Member] | Employee Stock Option [Member] | Non Employee Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period	1 year

Note 7 - Interest Expense, Ne39

Note 7 - Interest Expense, Net - Components of Interest Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Interest related to sale of tax benefits	$ 1,607	$ 2,565	$ 5,468	$ 6,269
Interest expense	13,299	15,726	41,620	47,214
Less — amount capitalized	(3,214)	(1,154)	(5,933)	(1,922)
Interest Expense, Total	$ 11,692	$ 17,137	$ 41,155	$ 51,561

Note 8 - Earnings Per Share (De

Note 8 - Earnings Per Share (Details Textual) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	8,851	225,191	6,494	116,641

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		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Weighted average number of shares used in computation of basic earnings per share (in shares)	50,367	49,599	49,942	49,410
Additional shares from the assumed exercise of employee stock options (in shares)	500	690	727	687
Weighted average number of shares used in computation of diluted earnings per share (in shares)	50,867	50,289	50,669	50,097

Note 9 - Business Segments (Det

Note 9 - Business Segments (Details Textual) $ in Thousands	9 Months Ended
	Sep. 30, 2017USD ($)	Dec. 31, 2016USD ($)
Number of Reportable Segments	2
Goodwill, Ending Balance	$ 20,667	$ 6,650
Electricity Segment [Member]
Goodwill, Ending Balance	$ 20,700

Note 9 - Business Segments - Su

Note 9 - Business Segments - Summarized Financial Information Concerning Reportable Segments (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2017		Sep. 30, 2016	Sep. 30, 2017		Sep. 30, 2016	Dec. 31, 2016
Revenues	$ 157,185		$ 184,617	$ 526,447		$ 496,072
Operating income	43,970		48,223	156,618		150,653
Segment assets at period end	2,503,738	[1]	2,279,271	2,503,738	[1]	2,279,271	$ 2,461,569
Intersegment Eliminations [Member]
Revenues	28,248		14,835	61,026		36,042
Electricity Segment [Member]
Revenues	112,273		109,795	339,826		321,664
Operating income	36,205		23,903	113,220		91,502
Segment assets at period end	2,371,855	[1]	2,137,845	2,371,855	[1]	2,137,845
Electricity Segment [Member] | Intersegment Eliminations [Member]
Revenues
Product Segment [Member]
Revenues	44,912		74,822	186,621		174,408
Operating income	7,765		24,320	43,398		59,151
Segment assets at period end	131,883	[1]	141,426	131,883	[1]	141,426
Product Segment [Member] | Intersegment Eliminations [Member]
Revenues	$ 28,248		$ 14,835	$ 61,026		$ 36,042
[1]	Electricity segment assets include goodwill in the amount of $20.7 million.

Note 9 - Business Segments - Re

Note 9 - Business Segments - Reconciling Information Between Reportable Segments and Consolidated Totals (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues	$ 157,185	$ 184,617	$ 526,447	$ 496,072
Operating income	43,970	48,223	156,618	150,653
Interest income	255	266	861	831
Interest expense, net	(11,692)	(17,137)	(41,155)	(51,561)
Derivatives and foreign currency transaction gains (losses)	(1,001)	(222)	2,040	(2,592)
Income attributable to sale of tax benefits	3,506	3,463	14,019	12,380
Other non-operating expense, net	(1,592)	(5,546)	(1,678)	(5,306)
Total consolidated income before income taxes and equity in losses of investees	33,446	29,047	130,705	104,405
Intersegment Eliminations [Member]
Revenues	28,248	14,835	61,026	36,042
Consolidation, Eliminations [Member]
Revenues	$ (28,248)	$ (14,835)	$ (61,026)	$ (36,042)

Note 10 - Commitments and Con45

Note 10 - Commitments and Contingencies (Details Textual) - Former Local Sales Representative vs. Ormat [Member] - Pending Litigation [Member] $ in Millions	Mar. 29, 2016USD ($)
Loss Contingency, Damages Sought, Value	$ 4.8
Loss Contingency, Additional Damages Sought for Ormat Geothermal Products Sales in Chile, Percent	3.75%
Loss Contingency, Damages Sought, Ormat Geothermal Products Sales in Chile, Period	10 years

Note 11 - Income Taxes (Resta46

Note 11 - Income Taxes (Restated) (Details Textual) - USD ($) $ in Millions	Jun. 20, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Mar. 31, 2017
Deferred Tax Liabilities, Undistributed Foreign Earnings		$ 111.1		$ 111.1	$ 111.1
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent					35.00%
Accrued Estimated Foreign Tax Withholdings		53.9		53.9	$ 53.9
Deferred Tax Assets, Tax Credit Carryforwards, Foreign		111.1		111.1	111.1			$ 116.2
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount		(39.9)
Deferred Tax Assets, Valuation Allowance, Total		$ 76.3		76.3	$ 76.3
Effective Income Tax Rate Reconciliation, Percent, Total		18.60%	41.70%		38.20%	28.40%
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount		$ 0.6	$ 0.6	2.3		$ 2.4
Undistributed Earnings of Foreign Subsidiaries							$ 367
Investment Tax Credit Carryforward [Member]
Deferred Tax Assets, Investments							$ 83.2
Tax Credit Carryforward Expiration Period							20 years
Minimum [Member] | General Business Tax Credit Carryforward [Member]
Tax Credit Carryforward Expiration Year							2,026
Maximum [Member] | General Business Tax Credit Carryforward [Member]
Tax Credit Carryforward Expiration Year							2,036
Domestic Tax Authority [Member]
Operating Loss Carryforwards, Total							$ 331.5
Domestic Tax Authority [Member] | Minimum [Member]
Tax Credit Carryforward Expiration Year							2,029
Domestic Tax Authority [Member] | Maximum [Member]
Tax Credit Carryforward Expiration Year							2,036
State and Local Jurisdiction [Member]
Operating Loss Carryforwards, Total							$ 231.1
State and Local Jurisdiction [Member] | Minimum [Member]
Tax Credit Carryforward Expiration Year							2,018
State and Local Jurisdiction [Member] | Maximum [Member]
Tax Credit Carryforward Expiration Year							2,036
Foreign Tax Authority [Member] | Kenya Revenue Authority [Member]
Income Tax Examination, Penalties Paid	$ 2.6
Investment Deduction Percentage	150.00%
Income Tax Examination, Interest Expense	$ 1.2
ISRAEL
National Corporate Tax Rate					16.00%
KENYA
National Corporate Tax Rate					37.50%
U.S. Foreign Tax Credits [Member]
Deferred Tax Assets, Valuation Allowance, Total		76		76	$ 76
Specific Valuation Allowance Attributable to Current Year Projected Activity [Member]
Deferred Tax Assets, Valuation Allowance, Total		0.3		0.3	0.3
Current Year Projected Activity [Member]
Deferred Tax Assets, Valuation Allowance, Total		$ 0.3		$ 0.3	$ 0.3

Note 12 - Subsequent Events (De

Note 12 - Subsequent Events (Details Textual) $ / shares in Units, $ in Thousands, ₪ in Millions

May 21, 2018USD ($)

May 21, 2018ILS (₪)

May 07, 2018USD ($)$ / shares

Apr. 30, 2018USD ($)MWh

Apr. 24, 2018USD ($)MWh

Mar. 22, 2018USD ($)

Mar. 01, 2018USD ($)$ / shares

Dec. 13, 2017USD ($)MWh

Nov. 07, 2017USD ($)$ / shares

Oct. 31, 2017USD ($)

Sep. 30, 2017USD ($)$ / shares

Sep. 30, 2016$ / shares

Sep. 30, 2017USD ($)$ / shares

Sep. 30, 2016USD ($)$ / shares

May 17, 2018USD ($)

May 03, 2018USD ($)

Dec. 31, 2016USD ($)

Dividends, Common Stock, Total

$ 16,612

$ 22,469

Common Stock, Dividends, Per Share, Declared | $ / shares

$ 0.08

$ 0.07

$ 0.33

$ 0.45

Payments to Acquire Additional Interest in Subsidiaries

$ 2,357

Property, Plant and Equipment, Net, Ending Balance

$ 1,621,012

$ 1,621,012

$ 1,556,378

Subsequent Event [Member]

Dividends, Common Stock, Total

$ 5,100

$ 11,500

$ 4,000

Common Stock, Dividends, Per Share, Declared | $ / shares

$ 0.10

$ 0.23

$ 0.08

Dividends Payable, Date of Record

May 21, 2018

Mar. 14, 2018

Nov. 21, 2017

Dividends Payable, Date to be Paid

May 30, 2018

Mar. 29, 2018

Dec. 5, 2017

Subsequent Event [Member] | U.S. Geothermal [Member]

Current Power Generation | MWh

38

Payments to Acquire Businesses, Gross

$ 110,000

Subsequent Event [Member] | Platanares [Member]

Non-recourse Finacing Agreement, Term

14 years

Subsequent Event [Member] | Migdal Loan [Member]

Debt Instrument, Interest Rate, Stated Percentage

4.80%

Debt Instrument, Face Amount

$ 100,000

Debt Instrument, Periodic Payment, Total

4,200

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

$ 37,000

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

0.50%

Debt Instrument Increase in Stated Interest Rate Each Additional Downgrade

0.25%

Debt Instrument Decrease in Stated Interest Rate for Each Rating Upgrade

0.25%

Debt to EBITDA Ratio Threshold for Rate Increase

4.5

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

0.50%

Debt to EBITDA Ratio Requirement

6

Stockholders Equity, Debt Covenant, Minimum Threshold

$ 650,000

Stockholders Equity to Total Assets, Ratio

25.00%

Stockholders Equity, Debt Covenant, Minimum Threshold to Pay Dividends

$ 800,000

Dividends to Net Income, Ratio

50.00%

Subsequent Event [Member] | Migdal Loan [Member] | Minimum [Member]

Debt Instrument, Interest Rate, Stated Percentage

4.80%

Subsequent Event [Member] | Migdal Loan [Member] | Maximum [Member]

Debt Instrument, Increase in Stated Interest Rate

1.00%

Subsequent Event [Member] | Platanares [Member]

Non-recourse Financing Agreement

$ 124,700

Current Power Generation | MWh

35

Subsequent Event [Member] | Platanares [Member] | Minimum [Member]

Debt Instrument, Interest Rate, Stated Percentage

6.75%

Subsequent Event [Member] | Platanares [Member] | Maximum [Member]

Debt Instrument, Interest Rate, Stated Percentage

7.25%

Subsequent Event [Member] | Tungsten Mountain [Member]

Parternship Agreement, Initial Purchase Price

$ 33,400

Partnership Agreement, Expected Additional Installments

$ 13,000

Expected Power Generating Capacity | MWh

24

Expected Average Annual Revenues

$ 15,000

Subsequent Event [Member] | Tungsten Mountain [Member] | ONGP Portfolio PPA [Member]

Power Purchase Agreements Term

26 years

Subsequent Event [Member] | Puna Geothermal Power Plant [Member]

Property, Plant and Equipment, Net, Ending Balance

$ 109,000

Subsequent Event [Member] | Heit vs Ormat Technologies, Inc. [Member]

Loss Contingency, Damages Sought, Value

$ 26,000

₪ 93

Subsequent Event [Member] | Ormat Nevada, OPC LLC [Member] | OPC Transaction [Member]

Payments to Acquire Additional Interest in Subsidiaries

$ 1,900

Subsequent Event [Member] | Ormat Nevada Inc. [Member] | U.S. Geothermal [Member]

Payments to Acquire Businesses, Gross

106,000

Subsequent Event [Member] | Ormat Technologies, Inc. [Member] | U.S. Geothermal [Member]

Payments to Acquire Businesses, Gross

$ 4,000