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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
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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

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

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