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Note 5 - Unconsolidated Investments - Unconsolidated Investments Mainly in Power Plants (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Sarulla | $ (6,416) | $ (4,772)
Sarulla [Member] |  |
Sarulla | $ 34,084 | $ (11,081)

X
- Definition Represents the accumulated losses in excess of investments in an entity not consolidated. + References No definition available. + Details
Name: | ora_AccumulatedLossesOfUnconsolidatedCompanyInExcessOfInvestment
Namespace Prefix: | ora_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_JointlyOwnedUtilityPlantAxis=ora_SarullaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |