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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) | $ 1,833 | $ (1,105) | $ 541
Usage (benefit) of operating loss carryforwards - U.S. | 73,049 | (14,072) | (30,596)
Change in valuation allowance | (58,757) | 16,411 | (14,324)
Change in foreign valuation allowance |  |  | (49,701)
Change in foreign income tax | 26,579 | 18,073 | 14,965
Change in lease transaction |  |  | (452)
Change in tax monetization transaction | (23,234) | 48,000 | 16,386
Change in depreciation | 129,408 | (55,462) | 28,370
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 | (118,610) | 10,227 | 10,335
Change in production tax credits and alternative minimum tax credit | (2,070) | (11,659) | 610
Basis difference in partnership interests | (12,433) | 7,660 | (10,870)
| $ (56,185) | $ 18,073 | $ (34,736)

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
Balance Type: | credit
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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
Period Type: | duration

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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Namespace Prefix: | ora_
Data Type: | xbrli:monetaryItemType
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- Definition The amount of deferred tax expense (benefit). + References No definition available. + Details
Name: | ora_DeferredTaxExpenseBenefit
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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Data Type: | xbrli:monetaryItemType
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