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Note 6 - Fair Value of Financial Instruments (Details) - Fair Value of Financial Instruments (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Note 6 - Fair Value of Financial Instruments (Details) - Fair Value of Financial Instruments [Line Items]    
Fair value levels-secured,unsecured and long term debt $ 10.0ora_OtherLongTermDebtFairValueDisclosure $ 23.3ora_OtherLongTermDebtFairValueDisclosure
Revolving lines of credit 20.3us-gaap_LinesOfCreditFairValueDisclosure 112.0us-gaap_LinesOfCreditFairValueDisclosure
Deposits 17.3us-gaap_Deposits 21.3us-gaap_Deposits
Olkaria III - DEG [Member] | Fair Value, Inputs, Level 3 [Member]    
Note 6 - Fair Value of Financial Instruments (Details) - Fair Value of Financial Instruments [Line Items]    
Fair value levels-secured,unsecured and long term debt 32.2ora_OtherLongTermDebtFairValueDisclosure
/ us-gaap_DebtInstrumentAxis
= ora_OlkariaIIIDEGMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 40.3ora_OtherLongTermDebtFairValueDisclosure
/ us-gaap_DebtInstrumentAxis
= ora_OlkariaIIIDEGMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Olkaria III - DEG [Member]    
Note 6 - Fair Value of Financial Instruments (Details) - Fair Value of Financial Instruments [Line Items]    
Fair value levels-secured,unsecured and long term debt 32.2ora_OtherLongTermDebtFairValueDisclosure
/ us-gaap_DebtInstrumentAxis
= ora_OlkariaIIIDEGMember		 40.3ora_OtherLongTermDebtFairValueDisclosure
/ us-gaap_DebtInstrumentAxis
= ora_OlkariaIIIDEGMember
Olkaria III - OPIC [Member] | Fair Value, Inputs, Level 3 [Member]    
Note 6 - Fair Value of Financial Instruments (Details) - Fair Value of Financial Instruments [Line Items]    
Fair value levels-secured,unsecured and long term debt 279.4ora_OtherLongTermDebtFairValueDisclosure
/ us-gaap_DebtInstrumentAxis
= ora_OlkariaIIIOPICMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 279.6ora_OtherLongTermDebtFairValueDisclosure
/ us-gaap_DebtInstrumentAxis
= ora_OlkariaIIIOPICMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Olkaria III - OPIC [Member]    
Note 6 - Fair Value of Financial Instruments (Details) - Fair Value of Financial Instruments [Line Items]    
Fair value levels-secured,unsecured and long term debt 279.4ora_OtherLongTermDebtFairValueDisclosure
/ us-gaap_DebtInstrumentAxis
= ora_OlkariaIIIOPICMember		 279.6ora_OtherLongTermDebtFairValueDisclosure
/ us-gaap_DebtInstrumentAxis
= ora_OlkariaIIIOPICMember
Ormat Funding Corp [Member] | Fair Value, Inputs, Level 2 [Member]    
Note 6 - Fair Value of Financial Instruments (Details) - Fair Value of Financial Instruments [Line Items]    
Fair value levels-secured,unsecured and long term debt 71.4ora_OtherLongTermDebtFairValueDisclosure
/ us-gaap_DebtInstrumentAxis
= ora_OrmatFundingCorpMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 83.5ora_OtherLongTermDebtFairValueDisclosure
/ us-gaap_DebtInstrumentAxis
= ora_OrmatFundingCorpMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Ormat Funding Corp [Member]    
Note 6 - Fair Value of Financial Instruments (Details) - Fair Value of Financial Instruments [Line Items]    
Fair value levels-secured,unsecured and long term debt 71.4ora_OtherLongTermDebtFairValueDisclosure
/ us-gaap_DebtInstrumentAxis
= ora_OrmatFundingCorpMember		 83.5ora_OtherLongTermDebtFairValueDisclosure
/ us-gaap_DebtInstrumentAxis
= ora_OrmatFundingCorpMember
Orcal Geothermal Inc [Member] | Fair Value, Inputs, Level 3 [Member]    
Note 6 - Fair Value of Financial Instruments (Details) - Fair Value of Financial Instruments [Line Items]    
Fair value levels-secured,unsecured and long term debt 55.5ora_OtherLongTermDebtFairValueDisclosure
/ us-gaap_DebtInstrumentAxis
= ora_OrcalGeothermalIncMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 65.8ora_OtherLongTermDebtFairValueDisclosure
/ us-gaap_DebtInstrumentAxis
= ora_OrcalGeothermalIncMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Orcal Geothermal Inc [Member]    
Note 6 - Fair Value of Financial Instruments (Details) - Fair Value of Financial Instruments [Line Items]    
Fair value levels-secured,unsecured and long term debt 55.5ora_OtherLongTermDebtFairValueDisclosure
/ us-gaap_DebtInstrumentAxis
= ora_OrcalGeothermalIncMember		 65.8ora_OtherLongTermDebtFairValueDisclosure
/ us-gaap_DebtInstrumentAxis
= ora_OrcalGeothermalIncMember
OFC Two Senior Secured Notes [Member] | Fair Value, Inputs, Level 3 [Member]    
Note 6 - Fair Value of Financial Instruments (Details) - Fair Value of Financial Instruments [Line Items]    
Fair value levels-secured,unsecured and long term debt 238.8ora_OtherLongTermDebtFairValueDisclosure
/ us-gaap_DebtInstrumentAxis
= ora_OFCTwoSeniorSecuredNotesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 119.0ora_OtherLongTermDebtFairValueDisclosure
/ us-gaap_DebtInstrumentAxis
= ora_OFCTwoSeniorSecuredNotesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
OFC Two Senior Secured Notes [Member]    
Note 6 - Fair Value of Financial Instruments (Details) - Fair Value of Financial Instruments [Line Items]    
Fair value levels-secured,unsecured and long term debt 238.8ora_OtherLongTermDebtFairValueDisclosure
/ us-gaap_DebtInstrumentAxis
= ora_OFCTwoSeniorSecuredNotesMember		 119.0ora_OtherLongTermDebtFairValueDisclosure
/ us-gaap_DebtInstrumentAxis
= ora_OFCTwoSeniorSecuredNotesMember
Senior Unsecured Bonds Member | Fair Value, Inputs, Level 3 [Member]    
Note 6 - Fair Value of Financial Instruments (Details) - Fair Value of Financial Instruments [Line Items]    
Fair value levels-secured,unsecured and long term debt 265.4ora_OtherLongTermDebtFairValueDisclosure
/ us-gaap_DebtInstrumentAxis
= ora_SeniorUnsecuredBondsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 270.6ora_OtherLongTermDebtFairValueDisclosure
/ us-gaap_DebtInstrumentAxis
= ora_SeniorUnsecuredBondsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Senior Unsecured Bonds Member    
Note 6 - Fair Value of Financial Instruments (Details) - Fair Value of Financial Instruments [Line Items]    
Fair value levels-secured,unsecured and long term debt 265.4ora_OtherLongTermDebtFairValueDisclosure
/ us-gaap_DebtInstrumentAxis
= ora_SeniorUnsecuredBondsMember		 270.6ora_OtherLongTermDebtFairValueDisclosure
/ us-gaap_DebtInstrumentAxis
= ora_SeniorUnsecuredBondsMember
Institutional Investors [Member] | Fair Value, Inputs, Level 3 [Member]    
Note 6 - Fair Value of Financial Instruments (Details) - Fair Value of Financial Instruments [Line Items]    
Fair value levels-secured,unsecured and long term debt 12.2ora_OtherLongTermDebtFairValueDisclosure
/ us-gaap_DebtInstrumentAxis
= ora_InstitutionalInvestorsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member		 20.1ora_OtherLongTermDebtFairValueDisclosure
/ us-gaap_DebtInstrumentAxis
= ora_InstitutionalInvestorsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Institutional Investors [Member]    
Note 6 - Fair Value of Financial Instruments (Details) - Fair Value of Financial Instruments [Line Items]    
Fair value levels-secured,unsecured and long term debt 12.2ora_OtherLongTermDebtFairValueDisclosure
/ us-gaap_DebtInstrumentAxis
= ora_InstitutionalInvestorsMember		 20.1ora_OtherLongTermDebtFairValueDisclosure
/ us-gaap_DebtInstrumentAxis
= ora_InstitutionalInvestorsMember
Amatitlan Member | Fair Value, Inputs, Level 3 [Member]    
Note 6 - Fair Value of Financial Instruments (Details) - Fair Value of Financial Instruments [Line Items]    
Fair value levels-secured,unsecured and long term debt   34.8ora_OtherLongTermDebtFairValueDisclosure
/ us-gaap_DebtInstrumentAxis
= ora_AmatitlanMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Amatitlan Member    
Note 6 - Fair Value of Financial Instruments (Details) - Fair Value of Financial Instruments [Line Items]    
Fair value levels-secured,unsecured and long term debt   34.8ora_OtherLongTermDebtFairValueDisclosure
/ us-gaap_DebtInstrumentAxis
= ora_AmatitlanMember
Fair Value, Inputs, Level 1 [Member]    
Note 6 - Fair Value of Financial Instruments (Details) - Fair Value of Financial Instruments [Line Items]    
Deposits 17.3us-gaap_Deposits
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member		 21.3us-gaap_Deposits
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 2 [Member]    
Note 6 - Fair Value of Financial Instruments (Details) - Fair Value of Financial Instruments [Line Items]    
Fair value levels-secured,unsecured and long term debt 10.0ora_OtherLongTermDebtFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 23.3ora_OtherLongTermDebtFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Revolving lines of credit $ 20.3us-gaap_LinesOfCreditFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member		 $ 112.0us-gaap_LinesOfCreditFairValueDisclosure
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member