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Note 5 - Fair Value of Financial Instruments (Details) - Financial Assets and Liabilities at Fair Value (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Current assets:    
Cost or Amortized Cost $ 70,724us-gaap_CashAndCashEquivalentsAtCarryingValue $ 40,230us-gaap_CashAndCashEquivalentsAtCarryingValue
Fair Value 97,641us-gaap_CashAndCashEquivalentsFairValueDisclosure 85,076us-gaap_CashAndCashEquivalentsFairValueDisclosure
Derivatives:    
Fair Value 95,621us-gaap_FairValueNetAssetLiability 86,323us-gaap_FairValueNetAssetLiability
Forward Contracts [Member] | Fair Value, Inputs, Level 1 [Member]    
Derivatives:    
Fair Value    [1]    [1]
Forward Contracts [Member] | Fair Value, Inputs, Level 2 [Member]    
Derivatives:    
Fair Value (2,020)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ForwardContractsMember		 [1] (2,882)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ForwardContractsMember		 [1]
Forward Contracts [Member] | Fair Value, Inputs, Level 3 [Member]    
Derivatives:    
Fair Value    [1]    [1]
Forward Contracts [Member]    
Derivatives:    
Fair Value (2,020)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ForwardContractsMember		 [1] (2,882)us-gaap_DerivativeFairValueOfDerivativeLiability
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ForwardContractsMember		 [1]
Forward Contracts [Member] | Reported Value Measurement [Member]    
Derivatives:    
Cost or Amortized Cost (2,020)us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ForwardContractsMember		 [1] (2,882)us-gaap_DerivativeLiabilities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
/ us-gaap_FinancialInstrumentAxis
= us-gaap_ForwardContractsMember		 [1]
Fair Value, Inputs, Level 1 [Member] | Natural Gas Price Swap [Member]    
Derivatives:    
Swap transaction on natural gas price (1)      [2]
Fair Value, Inputs, Level 1 [Member]    
Current assets:    
Fair Value 97,641us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 85,076us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Derivatives:    
Fair Value 97,641us-gaap_FairValueNetAssetLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 85,076us-gaap_FairValueNetAssetLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 2 [Member] | Natural Gas Price Swap [Member]    
Derivatives:    
Swap transaction on natural gas price (1)   4,129us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= ora_NaturalGasPriceSwapMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 [2]
Fair Value, Inputs, Level 2 [Member]    
Derivatives:    
Fair Value (2,020)us-gaap_FairValueNetAssetLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 1,247us-gaap_FairValueNetAssetLiability
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 3 [Member] | Natural Gas Price Swap [Member]    
Derivatives:    
Swap transaction on natural gas price (1)      [2]
Natural Gas Price Swap [Member]    
Derivatives:    
Swap transaction on natural gas price (1)   4,129us-gaap_DerivativeFairValueOfDerivativeAsset
/ us-gaap_DerivativeInstrumentRiskAxis
= ora_NaturalGasPriceSwapMember		 [2]
Reported Value Measurement [Member] | Natural Gas Price Swap [Member]    
Derivatives:    
Swap transaction on natural gas price (1)   4,129us-gaap_DerivativeAssets
/ us-gaap_DerivativeInstrumentRiskAxis
= ora_NaturalGasPriceSwapMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 [2]
Reported Value Measurement [Member]    
Current assets:    
Cost or Amortized Cost 97,641us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 85,076us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Derivatives:    
Cost or Amortized Cost $ 95,621us-gaap_AssetsNet
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember		 $ 86,323us-gaap_AssetsNet
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
[1] 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 March 31, 2015 and December 31, 2014, respectively, in the consolidated balance sheet with the corresponding gain or loss being recognized within "foreign currency translation and transaction losses" in the consolidated statement of operations and comprehensive income.
[2] 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 "accounts payable and accrued expenses" on December 31, 2014, 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.