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Note 4 - Unconsolidated Investments (Details) (USD $)
3 Months Ended 0 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Jun. 04, 2014
Jun. 30, 2014
May 16, 2014
Note 4 - Unconsolidated Investments (Details) [Line Items]          
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax $ 23,000us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax        
Sales Revenue, Goods, Net 30,278,000us-gaap_SalesRevenueGoodsNet 47,619,000us-gaap_SalesRevenueGoodsNet      
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest 10,267,000us-gaap_ProfitLoss 21,789,000us-gaap_ProfitLoss      
Sarulla [Member] | Intersegment Eliminations [Member]          
Note 4 - Unconsolidated Investments (Details) [Line Items]          
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest 800,000us-gaap_ProfitLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
/ us-gaap_JointlyOwnedUtilityPlantAxis
= ora_SarullaMember
       
Sarulla [Member] | Subject to Fixed Interest Rate [Member] | Lenders Consortium [Member]          
Note 4 - Unconsolidated Investments (Details) [Line Items]          
Senior Notes 100,000,000us-gaap_SeniorNotes
/ us-gaap_CounterpartyNameAxis
= ora_LendersConsortiumMember
/ us-gaap_JointlyOwnedUtilityPlantAxis
= ora_SarullaMember
/ us-gaap_StatementScenarioAxis
= ora_SubjectToFixedInterestRateMember
       
Sarulla [Member] | Subject to LIBOR based Interest Rate [Member] | Lenders Consortium [Member]          
Note 4 - Unconsolidated Investments (Details) [Line Items]          
Senior Notes 1,070,000,000us-gaap_SeniorNotes
/ us-gaap_CounterpartyNameAxis
= ora_LendersConsortiumMember
/ us-gaap_JointlyOwnedUtilityPlantAxis
= ora_SarullaMember
/ us-gaap_StatementScenarioAxis
= ora_SubjectToLIBORbasedInterestRateMember
       
Sarulla [Member] | Subject to Fixed LIBOR Interest Rate [Member] | Lenders Consortium [Member] | Interest Rate Swap [Member]          
Note 4 - Unconsolidated Investments (Details) [Line Items]          
Senior Notes       960,000,000us-gaap_SeniorNotes
/ us-gaap_CounterpartyNameAxis
= ora_LendersConsortiumMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_JointlyOwnedUtilityPlantAxis
= ora_SarullaMember
/ us-gaap_StatementScenarioAxis
= ora_SubjectToFixedLIBORInterestRateMember
 
Sarulla [Member] | Lenders Consortium [Member] | London Interbank Offered Rate (LIBOR) [Member] | Interest Rate Swap [Member]          
Note 4 - Unconsolidated Investments (Details) [Line Items]          
Debt Instrument, Basis Spread on Variable Rate     3.4565%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CounterpartyNameAxis
= ora_LendersConsortiumMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_JointlyOwnedUtilityPlantAxis
= ora_SarullaMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
   
Sarulla [Member] | Lenders Consortium [Member] | Interest Rate Swap [Member]          
Note 4 - Unconsolidated Investments (Details) [Line Items]          
Proceeds from Issuance of Senior Long-term Debt     50,000,000us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt
/ us-gaap_CounterpartyNameAxis
= ora_LendersConsortiumMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_JointlyOwnedUtilityPlantAxis
= ora_SarullaMember
   
Sarulla [Member] | Interest Rate Swap [Member]          
Note 4 - Unconsolidated Investments (Details) [Line Items]          
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax 11,400,000us-gaap_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
/ us-gaap_JointlyOwnedUtilityPlantAxis
= ora_SarullaMember
       
Sarulla [Member]          
Note 4 - Unconsolidated Investments (Details) [Line Items]          
Jointly Owned Utility Plant, Proportionate Ownership Share 12.75%us-gaap_JointlyOwnedUtilityPlantProportionateOwnershipShare
/ us-gaap_JointlyOwnedUtilityPlantAxis
= ora_SarullaMember
       
Expected Power Generating Capacity 330ora_ExpectedPowerGeneratingCapacity
/ us-gaap_JointlyOwnedUtilityPlantAxis
= ora_SarullaMember
       
Contract Effective Date Apr. 04, 2013        
Power Plant Usage Agreement Term 30 years        
Number Of Phases Of Construction 3ora_NumberOfPhasesOfConstruction
/ us-gaap_JointlyOwnedUtilityPlantAxis
= ora_SarullaMember
       
Power Utilization 110ora_PowerUtilization
/ us-gaap_JointlyOwnedUtilityPlantAxis
= ora_SarullaMember
       
Period To Start Remaining Phases Of Construction After Commencement Of First Phase 18 months        
Supply Commitment, Remaining Minimum Amount Committed 255,100,000us-gaap_SignificantSupplyCommitmentRemainingMinimumAmountCommitted
/ us-gaap_JointlyOwnedUtilityPlantAxis
= ora_SarullaMember
       
Sales Revenue, Goods, Net 15,800,000us-gaap_SalesRevenueGoodsNet
/ us-gaap_JointlyOwnedUtilityPlantAxis
= ora_SarullaMember
       
Payments to Acquire Projects 0us-gaap_PaymentsToAcquireProjects
/ us-gaap_JointlyOwnedUtilityPlantAxis
= ora_SarullaMember
       
Lenders Consortium [Member] | Sarulla [Member]          
Note 4 - Unconsolidated Investments (Details) [Line Items]          
Senior Notes 1,170,000,000us-gaap_SeniorNotes
/ us-gaap_CounterpartyNameAxis
= ora_LendersConsortiumMember
/ us-gaap_DebtInstrumentAxis
= ora_SarullaMember
       
Sarulla [Member] | Interest Rate Swap [Member]          
Note 4 - Unconsolidated Investments (Details) [Line Items]          
Derivative Instruments, Loss Recognized in Other Comprehensive Income (Loss), Effective Portion 25,900,000us-gaap_DerivativeInstrumentsLossRecognizedInOtherComprehensiveIncomeEffectivePortion
/ us-gaap_DebtInstrumentAxis
= ora_SarullaMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
       
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax $ 3,300,000us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax
/ us-gaap_DebtInstrumentAxis
= ora_SarullaMember
/ us-gaap_DerivativeInstrumentRiskAxis
= us-gaap_InterestRateSwapMember
       
Sarulla [Member]          
Note 4 - Unconsolidated Investments (Details) [Line Items]          
Number of Commercial Lenders in Funding Consortium         6ora_NumberOfCommercialLendersInFundingConsortium
/ us-gaap_DebtInstrumentAxis
= ora_SarullaMember