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Note 18 - Income Taxes - Reconciliation of Beginning and Ending Valuation Allowance (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Balance at beginning of the year | $ 116,234 | $ 92,898 | $ 183,598
Additions to valuation allowance | 46,560 | 23,336 |
Release of valuation allowance | (85,223) |  | (90,700)
Balance at end of the year | $ 77,571 | $ 116,234 | $ 92,898

X
- Definition Amount of increase in the valuation allowance for a specified deferred tax asset. + References No definition available. + Details
Name: | ora_ValuationAllowanceDeferredTaxAssetAddition
Namespace Prefix: | ora_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of decrease in the valuation allowance for a specified deferred tax asset attributable to the release of valuation allowance. + References No definition available. + Details
Name: | ora_ValuationAllowanceDeferredTaxAssetRelease
Namespace Prefix: | ora_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
Name: | us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant