Amount available for dividend distribution percent of cumulative net income.

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Debt instrument, issuance costs.

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The minimum prepay amount required by the debt agreement.

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Description of the frequency of periodic payments (monthly, quarterly, annual).

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Debt instrument prepayment premium percentage.

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The ratio of coverage for debt services.

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Debt to earnings before interest tax depreciation and amortization ratio.

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Government guarantee percent.

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The amount of capacity of line of credit facility increased.

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Other reserves not specifically and separately disclosed.

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Percentage of company assets.

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Related to power utilization.

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The amount of prepayment deposit on debt.

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The amount of prepayment penalty charges during the period.

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Represents the amount of surety bond borrowings available as of a specified date.

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Represents the amount of surety bonds outstanding as of a specified date.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Fair value amount of debt instrument that was repurchased.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of letters of credit outstanding under debtor-in-possession financing arrangement.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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The maximum amount of borrowing capacity under a line of credit that is available as of the balance sheet date for a specific purpose other than for financing goods acquired for inventory or imminent delivery to a customer.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount after tax and reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Amount of tax expense (benefit), after reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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The cash outflow for derivative instruments during the period, which are classified as financing activities, excluding those designated as hedging instruments.

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Amount of cash outflow for cost from early extinguishment and prepayment of debt. Includes, but is not limited to, third-party cost, premium paid, and other fee paid to lender directly for debt extinguishment or debt prepayment. Excludes accrued interest.

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Cash outflow in the form of capital distributions and dividends to common shareholders, preferred shareholders and noncontrolling interests.

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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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The cash inflow from the issuance of long-term debt that is not secured by collateral. Excludes proceeds from tax exempt unsecured debt.

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Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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Note 11 - Long-term Debt and Credit Agreements (Details Textual) $ in Thousands							1 Months Ended											3 Months Ended		12 Months Ended
	Dec. 21, 2016 USD ($)	Nov. 29, 2016 USD ($)	Sep. 14, 2016 USD ($)	Jul. 31, 2015 USD ($) MWh	Feb. 28, 2013 USD ($)	Nov. 30, 2012 USD ($)	Sep. 30, 2017 USD ($)	Aug. 18, 2014 USD ($)	Jun. 20, 2014 USD ($)	Nov. 30, 2013 USD ($)	May 31, 2013 USD ($)	Feb. 29, 2012 USD ($)	Oct. 31, 2011 USD ($)	Jul. 31, 2009 USD ($)	Mar. 30, 2009 USD ($)	Dec. 31, 2005 USD ($)	Feb. 29, 2004 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Jun. 30, 2017	May 31, 2017 USD ($)	Oct. 20, 2016 USD ($)	Aug. 29, 2014 USD ($)	Aug. 23, 2012 USD ($)	Sep. 30, 2011 USD ($)	Feb. 28, 2011 USD ($)	Aug. 31, 2010 USD ($)
Letters of Credit Outstanding, Amount																				$ 277,700
Repayments of Secured Debt																				14,270	$ 6,815	$ 30,638
Repayments of Long-term Debt, Total																				66,223	62,052	71,701
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Total																				135	141	147
Proceeds from Issuance of Unsecured Debt																					203,483
Debt To Earnings Before Interest Tax Depreciation And Amortization Ratio																				2.58
Stockholders' Equity Attributable to Parent, Ending Balance																				$ 1,211,378	1,076,690	993,434	$ 777,501
Percentage Of Company Assets																				49.40%
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance																				$ 1,295,700	1,168,272	1,087,307	789,324
Payments of Dividends, Total																				$ 20,500
Interest Rate Cap [Member]
Payments for Derivative Instrument, Financing Activities								$ 1,500
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Total																							900
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax, Total																							$ 600
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net																					100	$ 100
Covenant Requirement Minimum [Member]
Amount Available For Dividend Distribution Percent Of Cumulative Net Income																				0.35
Stockholders' Equity Attributable to Parent, Ending Balance																				$ 600,000
Percentage Of Company Assets																				25.00%
Maximum [Member] \| Covenant Requirement Minimum [Member]
Debt To Earnings Before Interest Tax Depreciation And Amortization Ratio																				6
Loan Agreement with Banco Industrial S.A. and Westrust Bank (International) Limited [Member]
Debt Instrument, Term				12 years
Debt Instrument, Face Amount				$ 42,000
Power Utilization \| MWh				20
Debt Instrument, Payment Frequency				12 years
Long-term Debt, Gross																				$ 33,300
Loan Agreement with Banco Industrial S.A. and Westrust Bank (International) Limited [Member] \| Historical [Member]
Debt Services, Coverage Ratio																				1.49
Loan Agreement with Banco Industrial S.A. and Westrust Bank (International) Limited [Member] \| Projected [Member]
Debt Services, Coverage Ratio																				1.89
Loan Agreement with Banco Industrial S.A. and Westrust Bank (International) Limited [Member] \| Covenant Requirement Minimum [Member]
Debt Services, Coverage Ratio				1.15
Loan Agreement with Banco Industrial S.A. and Westrust Bank (International) Limited [Member] \| Covenant Required to not Limit Dividends [Member]
Debt Services, Coverage Ratio				1.25
Loan Agreement with Banco Industrial S.A. and Westrust Bank (International) Limited [Member] \| Minimum [Member]
Debt Instrument, Prepayment Premium Percentage				0.50%
Loan Agreement with Banco Industrial S.A. and Westrust Bank (International) Limited [Member] \| Maximum [Member]
Debt Instrument, Prepayment Premium Percentage				1.00%
Loan Agreement with Banco Industrial S.A. and Westrust Bank (International) Limited [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Guaranteed [Member]
Debt Instrument, Basis Spread on Variable Rate				4.35%
Loan Agreement with Banco Industrial S.A. and Westrust Bank (International) Limited [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Not Guaranteed [Member]
Debt Instrument, Basis Spread on Variable Rate				4.75%
Loan Agreement with Banco Industrial S.A. and Westrust Bank (International) Limited [Member] \| London Interbank Offered Rate (LIBOR) [Member] \| Minimum [Member]
Debt Instrument, Basis Spread on Variable Rate				1.25%
Loan Agreement With OPIC [Member]
Debt Instrument, Face Amount																												$ 310,000
Debt Services, Coverage Ratio																				1.7
Long-term Debt, Gross																				$ 228,600
Restricted Cash and Cash Equivalents, Current, Total																				3,700	4,300
Letters of Credit Outstanding, Amount																				$ 16,700
Loan Agreement With OPIC [Member] \| In The First Two Years After the Plant Commercial Operation Date [Member]
Debt Instrument, Prepayment Premium Percentage																				2.00%
Loan Agreement With OPIC [Member] \| Third Year After the Plant 2 Commercial Operation Date [Member]
Debt Instrument, Prepayment Premium Percentage																				1.00%
Loan Agreement With OPIC [Member] \| Historical [Member]
Debt Services, Coverage Ratio																				2.64
Loan Agreement With OPIC [Member] \| Projected [Member]
Debt Services, Coverage Ratio																				3.09
Loan Agreement With OPIC [Member] \| Tranche One [Member]
Debt Instrument, Face Amount						$ 85,000
Long-term Debt, Gross																				$ 61,400
Debt Instrument, Interest Rate, Stated Percentage																				6.31%
Loan Agreement With OPIC [Member] \| Tranche Two [Member]
Debt Instrument, Face Amount						180,000
Long-term Debt, Gross						135,000														$ 132,400
Proceeds from Issuance of Debt					$ 45,000
Debt Instrument, Interest Rate, Stated Percentage																				6.31%
Loan Agreement With OPIC [Member] \| Tranche Three [Member]
Debt Instrument, Face Amount						45,000
Long-term Debt, Gross																				$ 34,900
Proceeds from Issuance of Debt										$ 45,000
Debt Instrument, Interest Rate, Stated Percentage																				6.12%
Loan Agreement With OPIC [Member] \| Threshold For Loan Default [Member]
Debt Services, Coverage Ratio																				1.1
Loan Agreement With OPIC [Member] \| Minimum [Member] \| Historical [Member]
Debt Services, Coverage Ratio																				1.4
Olkaria III DEG [Member]
Debt Instrument, Face Amount															$ 105,000
Debt Instrument, Basis Spread on Variable Rate															4.00%
Debt Instrument, Interest Rate, Stated Percentage															6.90%
Payment for Debt Extinguishment or Debt Prepayment Cost							$ 100
Repayments of Long-term Debt, Total							11,800
Olkaria III DEG [Member] \| Tranche One [Member]
Prepayment Deposit On Debt						20,500
Prepayment Penalty Charges						$ 1,500
Ormat Funding Corp [Member]
Debt Instrument, Face Amount																	$ 190,000
Proceeds from Issuance of Debt																	$ 179,700
Debt Instrument, Interest Rate, Stated Percentage																	8.25%
Debt Instrument, Issuance Costs																	$ 10,300
Repayments of Secured Debt							14,300
Payment for Debt Extinguishment or Debt Prepayment Cost							$ 1,300
Ormat Funding Corp [Member] \| Senior Notes [Member]
Debt Instrument, Repurchase Amount																		$ 6,800	$ 30,600
Gain (Loss) on Extinguishment of Debt, Total																		$ (600)	$ (1,700)
OrCal Senior Secured Notes [Member]
Debt Instrument, Face Amount																$ 165,000
Proceeds from Issuance of Debt																$ 161,100
Debt Instrument, Interest Rate, Stated Percentage																6.21%
Restricted Cash and Cash Equivalents, Current, Total																				$ 1,900	1,900
Letters of Credit Outstanding, Amount																				$ 32,100	35,200
Debt Instrument, Issuance Costs																$ 3,900
Debt Instrument, Redemption Price, Percentage																				100.00%
OrCal Senior Secured Notes [Member] \| Historical [Member]
Debt Services, Coverage Ratio																				1.54
OrCal Senior Secured Notes [Member] \| Projected [Member]
Debt Services, Coverage Ratio																				2.63
OrCal Senior Secured Notes [Member] \| Debt Service Reserve Backing [Member]
Letters of Credit Outstanding, Amount																				$ 4,600	4,600
OrCal Senior Secured Notes [Member] \| Minimum [Member]
Debt Services, Coverage Ratio																1.25
OFC Two Senior Secured Notes [Member]
Debt Instrument, Face Amount																													$ 350,000
Government Guarantee Percent																				80.00%
Debtor-in-Possession Financing, Letters of Credit Outstanding																				$ 18,700
OFC Two Senior Secured Notes [Member] \| Wholly Owned Subsidiaries With Project Debt [Member]
Debt Instrument, Face Amount																											$ 140,000
Debt Instrument, Interest Rate, Stated Percentage																											4.61%
OFC Two Senior Secured Notes [Member] \| Senior Notes [Member]
Secured Debt, Total																				$ 232,500	$ 247,200
OFC Two Senior Secured Notes [Member] \| Historical [Member]
Debt Services, Coverage Ratio																				2.7				2.25
OFC Two Senior Secured Notes [Member] \| Projected [Member]
Debt Services, Coverage Ratio																				2.04				2.13
OFC Two Senior Secured Notes [Member] \| Phase One Series A Senior Notes [Member]
Debt Instrument, Face Amount													$ 151,700
Proceeds from Issuance of Debt													$ 141,100
Debt Instrument, Interest Rate, Stated Percentage													4.687%
Repayments of Long-term Debt, Total									$ 4,300
Other Reserves																				$ 0							$ 28,000
OFC Two Senior Secured Notes [Member] \| Minimum [Member] \| Historical [Member]
Debt Services, Coverage Ratio																				1.2
OFC Two Senior Secured Notes [Member] \| Minimum [Member] \| Projected [Member]
Debt Services, Coverage Ratio																				1.5
Don A. Cambell Senior Secured Notes [Member]
Debt Instrument, Face Amount		$ 92,500
Proceeds from Issuance of Debt		$ 87,100
Debt Instrument, Interest Rate, Stated Percentage		4.03%
Secured Debt, Total																				$ 88,300
Debt Instrument, Minimum Prepay Amount		$ 2,000
Don A. Cambell Senior Secured Notes [Member] \| Historical [Member]
Debt Services, Coverage Ratio																				1.47
Don A. Cambell Senior Secured Notes [Member] \| Projected [Member]
Debt Services, Coverage Ratio																				1.81
Don A. Cambell Senior Secured Notes [Member] \| Minimum [Member]
Debt Services, Coverage Ratio		1.2
Senior Unsecured Bonds [Member]
Debt Instrument, Face Amount																														$ 107,500	$ 142,000
Debt Instrument, Interest Rate, Stated Percentage																														6.75%	7.00%
Proceeds from Issuance of Unsecured Debt			$ 250,000
Senior Unsecured Bonds [Member] \| Series 3 Bonds [Member]
Debt Instrument, Face Amount			137,000
Senior Unsecured Bonds, Series 2 [Member]
Debt Instrument, Face Amount			$ 67,000
Debt Instrument, Interest Rate, Stated Percentage			3.70%
Senior Unsecured Bonds, Series 3 [Member]
Debt Instrument, Interest Rate, Stated Percentage			4.45%
Institutional Investors [Member] \| Second Loan [Member]
Debt Instrument, Term														8 years
Debt Instrument, Face Amount														$ 20,000
Debt Instrument, Basis Spread on Variable Rate														5.00%
DEG 2 Facility Agreement [Member]
Debt Instrument, Interest Rate, Stated Percentage	6.28%
Debt Instrument, Minimum Prepay Amount	$ 5,000
Line of Credit Facility, Maximum Borrowing Capacity																										$ 50,000
Proceeds from Lines of Credit, Total	$ 50,000
Long-term Line of Credit, Total																				$ 50,000
Credit Agreements With Eight Commercial Banks [Member]
Letters of Credit Outstanding, Amount																				277,700
Line of Credit Facility, Maximum Borrowing Capacity																				468,000
Long-term Line of Credit, Total																				51,500
Credit Agreements With Eight Commercial Banks [Member] \| Extensions of Credit in The Form of Loans and/or Letters of Credit [Member]
Line of Credit Facility, Maximum Borrowing Capacity																				233,000
Credit Agreements With Eight Commercial Banks [Member] \| Letter of Credit [Member]
Line of Credit Facility, Maximum Borrowing Capacity																				235,000
Credit Agreements With Eight Commercial Banks [Member] \| Union Bank, N.A. [Member]
Line of Credit Facility, Maximum Borrowing Capacity																				60,000
Credit Agreements With Eight Commercial Banks [Member] \| HSBC Bank USA, N.A. [Member]
Line of Credit Facility, Maximum Borrowing Capacity																				$ 35,000
Union Bank, N.A. [Member]
Debt Services, Coverage Ratio																				2.96
Letters of Credit Outstanding, Amount																				$ 37,400
Debt To Earnings Before Interest Tax Depreciation And Amortization Ratio																				2.17
Amount Available For Dividend Distribution Percent Of Cumulative Net Income																				0.99
Union Bank, N.A. [Member] \| Minimum [Member]
Debt Services, Coverage Ratio												1.35
Union Bank, N.A. [Member] \| Maximum [Member]
Line of Credit Facility, Maximum Borrowing Capacity												$ 60,000
Debt To Earnings Before Interest Tax Depreciation And Amortization Ratio												4.5
Amount Available For Dividend Distribution Percent Of Cumulative Net Income												2
HSBC Bank USA, N.A. [Member]
Debt Services, Coverage Ratio																				2.96
Letters of Credit Outstanding, Amount																				$ 16,200
Line of Credit Facility, Maximum Borrowing Capacity											$ 35,000
Debt To Earnings Before Interest Tax Depreciation And Amortization Ratio																				2.17
Amount Available For Dividend Distribution Percent Of Cumulative Net Income																				0.99
Line of Credit Facility, Borrowing Capacity Increase											10,000
Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases											$ 10,000
HSBC Bank USA, N.A. [Member] \| Minimum [Member]
Debt Services, Coverage Ratio											1.35
HSBC Bank USA, N.A. [Member] \| Maximum [Member]
Debt To Earnings Before Interest Tax Depreciation And Amortization Ratio											4.5
Amount Available For Dividend Distribution Percent Of Cumulative Net Income											2
Surety Agreement [Member] \| Chubb [Member]
Surety Bonds Available																									$ 200,000
Surety Bonds Outstanding																				$ 106,200