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Note 19 - Business Segments (Restated) - Long Lived Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Long Lived Assets, Geographic Area	$ 2,133,289	$ 1,941,239	$ 1,857,129
UNITED STATES
Long Lived Assets, Geographic Area	1,510,986	1,414,523	1,374,465
KENYA
Long Lived Assets, Geographic Area	340,970	327,157	375,257
Other Foreign Countries [Member]
Long Lived Assets, Geographic Area	$ 281,333	$ 199,559	$ 107,407

X

- Definition

Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e9038-108599

+ Details

Name:	us-gaap_NoncurrentAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- Details

Name:	srt_StatementGeographicalAxis=country_US
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=country_KE
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_StatementGeographicalAxis=ora_OtherForeignCountriesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: