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Note 11 - Long-term Debt and Credit Agreements - Long-term Debt (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
| $ 622,145 | $ 681,548
Less current portion | (54,720) | (53,729)
Non current portion | 567,425 | 627,819
Recourse Debt | 306,419 | 274,983
Less current portion | (54,587) | (12,242)
Non current portion | 251,832 | 262,741
Other Loans, Limited and Non-recourse [Member] |  |
Non-Recourse Debt | 7,252 | 6,368
Loan Agreement With OPIC the Olkaria III Power Plant [Member] |  |
Non-Recourse Debt | 228,635 | 246,630
Loan Agreement with Banco Industrial S.A. and Westrust Bank (International) Limited [Member] |  |
Non-Recourse Debt | 33,251 | 36,750
Ormat Funding Corp [Member] |  |
Non-Recourse Debt |  | 17,026
OrCal Geothermal Inc [Member] |  |
Non-Recourse Debt | 32,142 | 35,181
Don A. Campbell 1 ("DAC1") [Member] |  |
Non-Recourse Debt | 88,339 | 92,361
OFC Two Senior Secured Notes [Member] |  |
Non-Recourse Debt | 232,526 | 247,232
Senior Unsecured Bonds [Member] |  |
Recourse Debt | 204,332 | 204,332
Institutional Investors [Member] |  |
Recourse Debt |  | 3,333
Olkaria III DEG [Member] |  |
Recourse Debt | 50,000 | 65,789
Loan From Commercial Bank [Member] |  |
Recourse Debt | 587 | 1,529
Revolving Credit Lines With Banks [Member] |  |
Recourse Debt | $ 51,500 |

X
- Definition Limited and non recourse debt. + References No definition available. + Details
Name: | ora_LimitedAndNonRecourseDebt
Namespace Prefix: | ora_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Limited and non recourse debt current. + References No definition available. + Details
Name: | ora_LimitedAndNonRecourseDebtCurrent
Namespace Prefix: | ora_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of limited and non-recourse debt classified as noncurrent. + References No definition available. + Details
Name: | ora_LimitedAndNonrecourseDebtNoncurrent
Namespace Prefix: | ora_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Recourse debt. + References No definition available. + Details
Name: | ora_RecourseDebt
Namespace Prefix: | ora_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Recourse debt current. + References No definition available. + Details
Name: | ora_RecourseDebtCurrent
Namespace Prefix: | ora_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Recourse debt noncurrent. + References No definition available. + Details
Name: | ora_RecourseDebtNoncurrent
Namespace Prefix: | ora_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of debt for which creditor does not have general recourse to the debtor but rather has recourse only to the property used for collateral in the transaction or other specific property. + References No definition available. + Details
Name: | us-gaap_NonRecourseDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_DebtInstrumentAxis=ora_OtherLoansLimitedAndNonrecourseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=ora_LoanAgreementWithOpicTheOlkariaIIIPowerPlantMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=ora_LoanAgreementWithBancoIndustrialSAAndWestrustBankInternationalLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=ora_OrmatFundingCorpMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=ora_OrCalGeothermalIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=ora_DonACampbell1Dac1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=ora_OFCTwoSeniorSecuredNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=ora_SeniorUnsecuredBondsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=ora_InstitutionalInvestorsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=ora_OlkariaIIIDEGMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=ora_LoanFromCommercialBankMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=ora_RevolvingCreditLinesWithBanksMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |