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Note 6 - Fair Value of Financial Instruments (Details) - Financial Assets and Liabilities at Fair Value (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Current assets:    
Carrying Value $ 40,230us-gaap_CashAndCashEquivalentsAtCarryingValue $ 57,354us-gaap_CashAndCashEquivalentsAtCarryingValue
Fair Value 85,076us-gaap_CashAndCashEquivalentsFairValueDisclosure 40,015us-gaap_CashAndCashEquivalentsFairValueDisclosure
Derivatives:    
Fair Value 86,323us-gaap_FairValueNetAssetLiability 39,474us-gaap_FairValueNetAssetLiability
Natural Gas Price Swap [Member] | Fair Value, Inputs, Level 1 [Member]    
Derivatives:    
Fair Value    [1]  
Natural Gas Price Swap [Member] | Fair Value, Inputs, Level 2 [Member]    
Derivatives:    
Fair Value 4,129us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FinancialInstrumentAxis
= ora_NaturalGasPriceSwapMember		 [1]  
Natural Gas Price Swap [Member] | Fair Value, Inputs, Level 3 [Member]    
Derivatives:    
Fair Value 0us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancialInstrumentAxis
= ora_NaturalGasPriceSwapMember		 [1]  
Natural Gas Price Swap [Member]    
Derivatives:    
Fair Value 4,129us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_FinancialInstrumentAxis
= ora_NaturalGasPriceSwapMember		 [1]  
Natural Gas Price Swap [Member] | Reported Value Measurement [Member]    
Derivatives:    
Carrying Value 4,129us-gaap_DerivativeAssets
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_FinancialInstrumentAxis
= ora_NaturalGasPriceSwapMember		 [1]  
Forward Contracts [Member] | Fair Value, Inputs, Level 1 [Member]    
Derivatives:    
Fair Value      [2]
Derivatives:    
Fair Value    [2]  
Forward Contracts [Member] | Fair Value, Inputs, Level 2 [Member]    
Derivatives:    
Fair Value   2,290us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ForwardContractsMember		 [2]
Derivatives:    
Fair Value (2,882)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ForwardContractsMember		 [2]  
Forward Contracts [Member] | Fair Value, Inputs, Level 3 [Member]    
Derivatives:    
Fair Value   0us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ForwardContractsMember		 [2]
Derivatives:    
Fair Value 0us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ForwardContractsMember		 [2]  
Forward Contracts [Member]    
Derivatives:    
Fair Value   2,290us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ForwardContractsMember		 [2]
Derivatives:    
Fair Value (2,882)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ForwardContractsMember		 [2]  
Forward Contracts [Member] | Reported Value Measurement [Member]    
Derivatives:    
Carrying Value   2,290us-gaap_DerivativeAssets
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ForwardContractsMember		 [2]
Derivatives:    
Carrying Value (2,882)us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ForwardContractsMember		 [2]  
Crude Oil Price Swap [Member] | Fair Value, Inputs, Level 1 [Member]    
Derivatives:    
Fair Value      [3]
Crude Oil Price Swap [Member] | Fair Value, Inputs, Level 2 [Member]    
Derivatives:    
Fair Value   (2,490)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FinancialInstrumentAxis
= ora_CrudeOilPriceSwapMember		 [3]
Crude Oil Price Swap [Member] | Fair Value, Inputs, Level 3 [Member]    
Derivatives:    
Fair Value   0us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_FinancialInstrumentAxis
= ora_CrudeOilPriceSwapMember		 [3]
Crude Oil Price Swap [Member]    
Derivatives:    
Fair Value   (2,490)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_FinancialInstrumentAxis
= ora_CrudeOilPriceSwapMember		 [3]
Crude Oil Price Swap [Member] | Reported Value Measurement [Member]    
Derivatives:    
Carrying Value   (2,490)us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_FinancialInstrumentAxis
= ora_CrudeOilPriceSwapMember		 [3]
Fair Value, Inputs, Level 1 [Member] | Natural Gas Price Swap [Member]    
Derivatives:    
Fair Value      [1]
Fair Value, Inputs, Level 1 [Member]    
Current assets:    
Fair Value 85,076us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 40,015us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Derivatives:    
Fair Value 85,076us-gaap_FairValueNetAssetLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 40,015us-gaap_FairValueNetAssetLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 2 [Member] | Natural Gas Price Swap [Member]    
Derivatives:    
Fair Value   (341)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= ora_NaturalGasPriceSwapMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [1]
Fair Value, Inputs, Level 2 [Member]    
Derivatives:    
Fair Value 1,247us-gaap_FairValueNetAssetLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 (541)us-gaap_FairValueNetAssetLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 3 [Member] | Natural Gas Price Swap [Member]    
Derivatives:    
Fair Value   0us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= ora_NaturalGasPriceSwapMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 [1]
Natural Gas Price Swap [Member]    
Derivatives:    
Fair Value   (341)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_DerivativeInstrumentRiskAxis
= ora_NaturalGasPriceSwapMember		 [1]
Natural Gas Price Swap [Member] | Reported Value Measurement [Member]    
Derivatives:    
Carrying Value   (341)us-gaap_DerivativeLiabilities
/ us-gaap_DerivativeInstrumentRiskAxis
= ora_NaturalGasPriceSwapMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 [1]
Reported Value Measurement [Member]    
Current assets:    
Carrying Value 85,076us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 40,015us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Derivatives:    
Carrying Value $ 86,323us-gaap_AssetsNet
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 $ 39,474us-gaap_AssetsNet
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
[1] This amount relates to derivatives which represent swap contract on natural gas prices, valued primarily based on observable inputs, including forward and spot prices for related commodity indices, and are included within "prepaid expenses and other" and "accounts payable and accrued expenses" on December 31, 2014 and 2013, respectively, in the consolidated balance sheets with the corresponding gain or loss being recognized within "electricity revenue" in the consolidated statement of operations and comprehensive income (loss).
[2] These amounts relate to derivatives which represent currency forward contracts valued primarily based on observable inputs, including forward and spot prices for currencies, netted against contracted rates and then multiplied against notional amounts, and are included within :accounts payable and accrued expenses" and "prepaid expenses and other" on December 31, 2014 and 2013, respectively, in the consolidated balance sheet with the corresponding gain or loss being recognized within "foreign currency translation and transaction gains (losses)" in the consolidated statement of operations and comprehensive income (loss).
[3] This amount relates to derivatives which represent swap contract on oil prices, valued primarily based on observable inputs, including forward and spot prices for related commodity indices, and are included within "accounts payable and accrued expenses" on December 31, 2013, in the consolidated balance sheets with the corresponding gain or loss being recognized within "electricity revenues" in the consolidated statement of operations and comprehensive income (loss).