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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: