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Note 18 - Income Taxes (Details Textual) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended | 13 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jun. 20, 2017 | Sep. 11, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2018
Deferred Tax Assets, Investments |  |  |  | $ 813,000 | $ 1,341,000 |  |  |  |  |  | $ 813,000 | $ 1,341,000 |  |  |  |
Deferred Tax Assets, Tax Credit Carryforwards, General Business |  |  |  | 85,193,000 | 82,451,000 |  |  |  |  |  | 85,193,000 | 82,451,000 |  |  |  |
Deferred Tax Assets, Tax Credit Carryforwards, Foreign |  |  |  | 86,206,000 |  |  |  |  |  |  | 86,206,000 |  |  |  |  |
Deferred Tax Assets, Valuation Allowance |  |  |  | 50,858,000 | 109,611,000 |  |  |  |  |  | 50,858,000 | 109,611,000 | $ 70,536,000 | $ 111,280,000 |  |
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount |  |  |  |  |  |  |  |  |  |  | (58,700,000) |  |  |  |  |
Uncertain Tax Benefit, Reudction to Deferred Tax Asset | [1] |  |  | 95,000 |  |  |  |  |  |  | 95,000 |  |  |  |  |
Foreign Earnings Repatriated |  |  |  | 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Expense (Benefit), Impact of Reinvestment of Undistributed Foreign Earnings, Withholding Tax |  |  |  |  |  |  |  |  |  |  | 58,300,000 |  |  |  |  |
Undistributed Earnings of Foreign Subsidiaries |  |  |  | 401,000,000 |  |  |  |  |  |  | 401,000,000 |  |  |  |  |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate |  |  |  | 9,000,000 | 5,700,000 |  |  |  |  |  | 9,000,000 | 5,700,000 |  |  |  |
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 6,400,000 | $ 1,300,000 |  |  |
Depreciation Bonus Permitted Write Off Equipment Cost Percentage |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |
Depreciation Bonus Period to Write Off The Reminder of Equipment Cost |  |  |  |  |  |  |  |  |  |  | 60 days |  |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  |  |  |  |  |  |  |  | 35.00% | 35.00% | 35.00% |  |  |
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability |  |  |  |  |  |  |  |  |  |  | $ 22,600,000 |  |  |  |  |
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount |  |  |  |  |  |  |  |  |  |  | $ 71,900,000 |  |  |  |  |
Placed in Service After December 31, 2022 and Before January 1, 2024 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation Bonus Permitted Write Off Equipment Cost Percentage |  |  |  |  |  |  |  |  |  |  | 80.00% |  |  |  |  |
Placed in Service After December 31, 2023 and Before January 1, 2025 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation Bonus Permitted Write Off Equipment Cost Percentage |  |  |  |  |  |  |  |  |  |  | 60.00% |  |  |  |  |
Placed in Service After December 31, 2024 and Before January 1, 2026 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation Bonus Permitted Write Off Equipment Cost Percentage |  |  |  |  |  |  |  |  |  |  | 40.00% |  |  |  |  |
Placed in Service After December 31, 2025 and Before January 1, 2027 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation Bonus Permitted Write Off Equipment Cost Percentage |  |  |  |  |  |  |  |  |  |  | 20.00% |  |  |  |  |
Scenario, Forecast [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign Earnings Repatriated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 396,000,000
Distribution of Earnings in Foreign Subsidiaries |  |  |  |  |  |  |  |  |  | $ 96,000,000 |  |  |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  |  |  |  |  |  |  |  | 21.00% |  |  |  |  |  |
Accounting Standards Update 2013-11 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Uncertain Tax Benefit, Reudction to Deferred Tax Asset |  |  |  | 100,000 |  |  |  |  |  |  | $ 100,000 |  |  |  |  |
Investment Tax Credit Carryforward [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deferred Tax Assets, Investments |  |  |  | 800,000 |  |  |  |  |  |  | $ 800,000 |  |  |  |  |
General Business Tax Credit Carryforward [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax Credit Carryforward Expiration Period |  |  |  |  |  |  |  |  |  |  | 20 years |  |  |  |  |
Minimum [Member] | General Business Tax Credit Carryforward [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax Credit Carryforward Expiration Year |  |  |  |  |  |  |  |  |  |  | 2026 |  |  |  |  |
Maximum [Member] | General Business Tax Credit Carryforward [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax Credit Carryforward Expiration Year |  |  |  |  |  |  |  |  |  |  | 2037 |  |  |  |  |
Deferred Tax Assets, Tax Credit Carryforwards, General Business |  |  |  | 85,200,000 |  |  |  |  |  |  | $ 85,200,000 |  |  |  |  |
Domestic Tax Authority [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards |  |  |  | 145,000,000 |  |  |  |  |  |  | $ 145,000,000 |  |  |  |  |
Domestic Tax Authority [Member] | Placed in Service Before January 2018 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Tax Credit, Percentage of Eligible Cost |  |  |  |  |  |  |  |  |  |  | 30.00% |  |  |  |  |
Domestic Tax Authority [Member] | Placed in Service After January 2018 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment Tax Credit, Percentage of Eligible Cost |  |  |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |
Domestic Tax Authority [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax Credit Carryforward Expiration Year |  |  |  |  |  |  |  |  |  |  | 2029 |  |  |  |  |
Domestic Tax Authority [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax Credit Carryforward Expiration Year |  |  |  |  |  |  |  |  |  |  | 2037 |  |  |  |  |
State and Local Jurisdiction [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating Loss Carryforwards |  |  |  | 222,200,000 |  |  |  |  |  |  | $ 222,200,000 |  |  |  |  |
State and Local Jurisdiction [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax Credit Carryforward Expiration Year |  |  |  |  |  |  |  |  |  |  | 2018 |  |  |  |  |
State and Local Jurisdiction [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax Credit Carryforward Expiration Year |  |  |  |  |  |  |  |  |  |  | 2037 |  |  |  |  |
Foreign Tax Authority [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax Credit Carryforward Expiration Period |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |
Deferred Tax Assets, Tax Credit Carryforwards, Foreign |  |  |  | $ 86,200,000 |  |  |  |  |  |  | $ 86,200,000 |  |  |  |  |
Foreign Tax Authority [Member] | Tax Authority of Guatemala in Guatemala [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
National Corporate Tax Rate |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |
Tax Exemption Period |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |
Effective Income Tax Rate |  |  |  |  |  |  |  |  |  |  | 7.00% |  |  |  |  |
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount |  |  |  |  |  |  |  |  |  |  | $ 2,600,000 | $ 3,300,000 | $ 3,600,000 |  |  |
Income Tax Benefit From Examination Per Share |  |  |  |  |  |  |  |  |  |  | 0.05 | 0.07 | 0.08 |  |  |
Foreign Tax Authority [Member] | Israel Tax Authority [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
National Corporate Tax Rate |  |  |  |  |  |  |  |  |  |  | 24.00% | 25.00% | 26.50% |  |  |
Foreign Tax Authority [Member] | Israel Tax Authority [Member] | Ormat Systems Ltd [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective Income Tax Rate, Year Four and Thereafter |  |  |  |  |  |  |  |  |  |  |  |  |  | 16.00% |  |
Tax Rate on Exempt Income, in Event of Distribution |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |
Deferred Tax Liability, Rate, Respect of Tax Exempt Income |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |
Foreign Tax Authority [Member] | Kenya Revenue Authority [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
National Corporate Tax Rate |  |  |  |  |  |  |  |  |  |  | 37.50% |  |  |  |  |
Investment Deduction Percentage |  | 150.00% | 150.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination, Penalties Paid |  | $ 2,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Tax Examination, Interest Accrued and Waiver Requested |  | $ 1,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign Tax Authority [Member] | Kenya Revenue Authority [Member] | Reduction of Income Tax Expense and Deferred Liabilities Due to Overstatement of Tax Position [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current Period Reclassification Adjustment |  |  |  |  | $ 4,700,000 |  |  |  |  |  |  |  |  |  |  |
Foreign Tax Authority [Member] | Ministry of the Economy, Finance and Industry, France [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
National Corporate Tax Rate |  |  |  |  |  |  |  |  |  |  | 34.43% |  |  |  |  |
Foreign Tax Authority [Member] | Sistema de Administración de Rentas [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income Taxes Exempt Period |  |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |
Foreign Tax Authority [Member] | Inland Revenue Department, New Zealand [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
National Corporate Tax Rate |  |  |  |  |  |  |  |  |  |  |  |  | 28.00% | 28.00% | 28.00% |
Foreign Tax Authority [Member] | Scenario, Forecast [Member] | Israel Tax Authority [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
National Corporate Tax Rate |  |  |  |  |  |  |  |  |  | 23.00% |  |  |  |  |  |
Foreign Tax Authority [Member] | Scenario, Forecast [Member] | Ministry of the Economy, Finance and Industry, France [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
National Corporate Tax Rate |  |  |  |  |  | 25.00% | 26.50% | 28.00% |  |  |  |  |  |  |  |
Corporate Income Tax Rate, Taxable Income of Euro 0.5 Million |  |  |  |  |  |  |  |  | 28.00% | 28.00% |  |  |  |  |  |
Corporate Income Tax Rate, Taxable Income Exceeding Euro 0.5 Million |  |  |  |  |  |  |  |  | 31.00% | 33.30% |  |  |  |  |  |
Foreign Tax Authority [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax Credit Carryforward Expiration Year |  |  |  |  |  |  |  |  |  |  | 2027 |  |  |  |  |
Foreign Tax Authority [Member] | Minimum [Member] | Kenya Revenue Authority [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax Losses Carryforward Period |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign Tax Authority [Member] | Maximum [Member] | Kenya Revenue Authority [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tax Losses Carryforward Period |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | The non-current deferred tax asset has been reduced by the uncertain tax benefit of $0.1 million in accordance with ASU 2013-11

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