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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