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Note 6 - Fair Value of Financial Instruments (Details) - Fair Value of Long-term Debt Approximates its Carrying Amount, Exceptions (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Note 6 - Fair Value of Financial Instruments (Details) - Fair Value of Long-term Debt Approximates its Carrying Amount, Exceptions [Line Items]    
Loan from institutional investors $ 10.0ora_OtherLongTermDebtFairValueDisclosure $ 23.3ora_OtherLongTermDebtFairValueDisclosure
Olkaria III - DEG [Member]    
Note 6 - Fair Value of Financial Instruments (Details) - Fair Value of Long-term Debt Approximates its Carrying Amount, Exceptions [Line Items]    
Loan from institutional investors 32.2ora_OtherLongTermDebtFairValueDisclosure
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Olkaria III - DEG [Member] | Estimate of Fair Value Measurement [Member]    
Note 6 - Fair Value of Financial Instruments (Details) - Fair Value of Long-term Debt Approximates its Carrying Amount, Exceptions [Line Items]    
Loan 32.2us-gaap_LoansPayableFairValueDisclosure
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Olkaria III - DEG [Member] | Reported Value Measurement [Member]    
Note 6 - Fair Value of Financial Instruments (Details) - Fair Value of Long-term Debt Approximates its Carrying Amount, Exceptions [Line Items]    
Loan 31.6us-gaap_LoansPayableFairValueDisclosure
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Olkaria III - OPIC [Member]    
Note 6 - Fair Value of Financial Instruments (Details) - Fair Value of Long-term Debt Approximates its Carrying Amount, Exceptions [Line Items]    
Loan from institutional investors 279.4ora_OtherLongTermDebtFairValueDisclosure
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Olkaria III - OPIC [Member] | Estimate of Fair Value Measurement [Member]    
Note 6 - Fair Value of Financial Instruments (Details) - Fair Value of Long-term Debt Approximates its Carrying Amount, Exceptions [Line Items]    
Loan 279.4us-gaap_LoansPayableFairValueDisclosure
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Olkaria III - OPIC [Member] | Reported Value Measurement [Member]    
Note 6 - Fair Value of Financial Instruments (Details) - Fair Value of Long-term Debt Approximates its Carrying Amount, Exceptions [Line Items]    
Loan 282.6us-gaap_LoansPayableFairValueDisclosure
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Amatitlan Member    
Note 6 - Fair Value of Financial Instruments (Details) - Fair Value of Long-term Debt Approximates its Carrying Amount, Exceptions [Line Items]    
Loan from institutional investors   34.8ora_OtherLongTermDebtFairValueDisclosure
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Amatitlan Member | Estimate of Fair Value Measurement [Member]    
Note 6 - Fair Value of Financial Instruments (Details) - Fair Value of Long-term Debt Approximates its Carrying Amount, Exceptions [Line Items]    
Loan   34.8us-gaap_LoansPayableFairValueDisclosure
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Note 6 - Fair Value of Financial Instruments (Details) - Fair Value of Long-term Debt Approximates its Carrying Amount, Exceptions [Line Items]    
Loan   31.5us-gaap_LoansPayableFairValueDisclosure
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Ormat Funding Corp [Member]    
Note 6 - Fair Value of Financial Instruments (Details) - Fair Value of Long-term Debt Approximates its Carrying Amount, Exceptions [Line Items]    
Loan from institutional investors 71.4ora_OtherLongTermDebtFairValueDisclosure
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Note 6 - Fair Value of Financial Instruments (Details) - Fair Value of Long-term Debt Approximates its Carrying Amount, Exceptions [Line Items]    
Senior Secured Notes 71.4us-gaap_NotesPayableFairValueDisclosure
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Ormat Funding Corp [Member] | Reported Value Measurement [Member]    
Note 6 - Fair Value of Financial Instruments (Details) - Fair Value of Long-term Debt Approximates its Carrying Amount, Exceptions [Line Items]    
Senior Secured Notes 67.2us-gaap_NotesPayableFairValueDisclosure
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Orcal Geothermal Inc [Member]    
Note 6 - Fair Value of Financial Instruments (Details) - Fair Value of Long-term Debt Approximates its Carrying Amount, Exceptions [Line Items]    
Loan from institutional investors 55.5ora_OtherLongTermDebtFairValueDisclosure
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Note 6 - Fair Value of Financial Instruments (Details) - Fair Value of Long-term Debt Approximates its Carrying Amount, Exceptions [Line Items]    
Senior Secured Notes 55.5us-gaap_NotesPayableFairValueDisclosure
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Orcal Geothermal Inc [Member] | Reported Value Measurement [Member]    
Note 6 - Fair Value of Financial Instruments (Details) - Fair Value of Long-term Debt Approximates its Carrying Amount, Exceptions [Line Items]    
Senior Secured Notes 55.1us-gaap_NotesPayableFairValueDisclosure
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OFC Two Senior Secured Notes [Member]    
Note 6 - Fair Value of Financial Instruments (Details) - Fair Value of Long-term Debt Approximates its Carrying Amount, Exceptions [Line Items]    
Loan from institutional investors 238.8ora_OtherLongTermDebtFairValueDisclosure
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Note 6 - Fair Value of Financial Instruments (Details) - Fair Value of Long-term Debt Approximates its Carrying Amount, Exceptions [Line Items]    
Senior Secured Notes 238.8us-gaap_NotesPayableFairValueDisclosure
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Note 6 - Fair Value of Financial Instruments (Details) - Fair Value of Long-term Debt Approximates its Carrying Amount, Exceptions [Line Items]    
Senior Secured Notes 272.5us-gaap_NotesPayableFairValueDisclosure
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Senior Unsecured Bonds Member    
Note 6 - Fair Value of Financial Instruments (Details) - Fair Value of Long-term Debt Approximates its Carrying Amount, Exceptions [Line Items]    
Loan from institutional investors 265.4ora_OtherLongTermDebtFairValueDisclosure
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Note 6 - Fair Value of Financial Instruments (Details) - Fair Value of Long-term Debt Approximates its Carrying Amount, Exceptions [Line Items]    
Senior Unsecured Bonds 265.4us-gaap_LongTermDebtFairValue
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Senior Unsecured Bonds Member | Reported Value Measurement [Member]    
Note 6 - Fair Value of Financial Instruments (Details) - Fair Value of Long-term Debt Approximates its Carrying Amount, Exceptions [Line Items]    
Senior Unsecured Bonds 250.4us-gaap_LongTermDebtFairValue
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Institutional Investors [Member]    
Note 6 - Fair Value of Financial Instruments (Details) - Fair Value of Long-term Debt Approximates its Carrying Amount, Exceptions [Line Items]    
Loan from institutional investors 12.2ora_OtherLongTermDebtFairValueDisclosure
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Institutional Investors [Member] | Estimate of Fair Value Measurement [Member]    
Note 6 - Fair Value of Financial Instruments (Details) - Fair Value of Long-term Debt Approximates its Carrying Amount, Exceptions [Line Items]    
Loan from institutional investors 12.2ora_OtherLongTermDebtFairValueDisclosure
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Institutional Investors [Member] | Reported Value Measurement [Member]    
Note 6 - Fair Value of Financial Instruments (Details) - Fair Value of Long-term Debt Approximates its Carrying Amount, Exceptions [Line Items]    
Loan from institutional investors $ 11.9ora_OtherLongTermDebtFairValueDisclosure
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