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Note 18 - Income Taxes - Significant Components of Deferred Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Other deferred tax expense (exclusive of the effect of other components listed below) | $ 4,337 | $ (1,822) | $ 2,034
Usage (benefit) of operating loss carryforwards - U.S. | 72,293 | (28,065) | (5,576)
Change in valuation allowance | (38,548) | 23,336 | (40,999)
Change in foreign valuation allowance |  |  | (49,701)
Change in foreign income tax | 25,502 | 23,724 | 14,365
Change in lease transaction |  |  | 4,574
Change in tax monetization transaction | (3,091) | 51,040 | 16,004
Change in depreciation | (29,265) | (42,411) | (205)
Change in foreign tax credits | (86,206) |  |
Change in withholding tax | 14,400 |  |
Change in state and investment tax credits | (144) |  |
Change in intangible drilling costs | 19,008 | 4,511 | 4,932
Change in production tax credits and alternative minimum tax credit | (2,086) | (11,643) | 610
Basis difference in partnership interests | (9,700) | 5,111 | 18,794
| $ (33,500) | $ 23,781 | $ (35,168)

X
- Definition Amount of deferred income tax expense (benefit) pertaining to changes in the basis difference in a partnership interest. + References No definition available. + Details
Name: | ora_DeferredIncomeTaxExpenseBenefitBasisDifferenceInPartnershipInterest
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X
- Definition Amount of deferred income tax expense (benefit) pertaining to changes in the basis difference in a partnership interest. + References No definition available. + Details
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X
- Definition Deferred income tax expense benefit change in foreign income tax. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Represents the amount of deferred income tax expense (benefit) change in foreign tax credits during the period. + References No definition available. + Details
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Namespace Prefix: | ora_
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- Definition Amount of other deferred income tax expense (benefit) pertaining to changes in foreign valuation allowance. + References No definition available. + Details
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Namespace Prefix: | ora_
Data Type: | xbrli:monetaryItemType
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X
- Definition Deferred income tax expense benefit change in intangible drilling costs. + References No definition available. + Details
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X
- Definition Represents the amount of deferred income tax expense (benefit) change in investment tax credits during the period. + References No definition available. + Details
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Namespace Prefix: | ora_
Data Type: | xbrli:monetaryItemType
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X
- Definition Deferred income tax expense benefit change in lease transaction. + References No definition available. + Details
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- Definition Deferred income tax expense benefit change in tax monetization transaction. + References No definition available. + Details
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- Definition Deferred income tax expense benefit change in valuation allowance. + References No definition available. + Details
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Namespace Prefix: | ora_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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X
- Definition Represents the amount of deferred income tax expense (benefit) change in withholding tax during the period. + References No definition available. + Details
Name: | ora_DeferredIncomeTaxExpenseBenefitChangeInWithholdingTax
Namespace Prefix: | ora_
Data Type: | xbrli:monetaryItemType
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- Definition Deferred income tax expense benefit operating loss carryforwards. + References No definition available. + Details
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- Definition Deferred income tax expense benefit production tax credits. + References No definition available. + Details
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- Definition The amount of deferred tax expense (benefit). + References No definition available. + Details
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Namespace Prefix: | ora_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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X
- Definition Total deferred income tax expense benefit. + References No definition available. + Details
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