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Note 13 - Tax Monetization Transactions (Details Textual)
$ in Thousands
12 Months Ended 72 Months Ended
Dec. 31, 2022
May 17, 2018
USD ($)
Mar. 17, 2018
MWh
Oct. 31, 2017
USD ($)
Jul. 10, 2017
USD ($)
Dec. 16, 2016
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2022
USD ($)
Proceeds from Noncontrolling Interests             $ 4,134 $ 2,017 $ 1,972  
OPC LLC [Member]                    
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests               (1,932)    
Ormat Nevada ORTP LLC [Member]                    
Payments to Acquire Additional Interest in Subsidiaries             2,400  
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests               (4,051)    
Noncontrolling Interest [Member] | OPC LLC [Member]                    
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests             6,500 6,537    
Noncontrolling Interest [Member] | Ormat Nevada ORTP LLC [Member]                    
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests             (7,000) (6,964)    
Additional Paid-in Capital [Member] | OPC LLC [Member]                    
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests             (8,500) (8,469)    
Additional Paid-in Capital [Member] | Ormat Nevada ORTP LLC [Member]                    
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests             $ 2,900 $ 2,913    
Tungsten Mountain [Member]                    
Power Generated Under Contract | MWh     26              
Parternship Agreement, Initial Purchase Price   $ 33,400                
Partnership Agreement, Expected Additional Installments   $ 13,000                
Partnership Agreement, Percentage of Distributable Cash Flow Generated   97.50%                
Partnership Agreement, Percentage of Taxable Income   95.00%                
Opal Geo LLC [Member]                    
Percentage Of Distributable Cash to Controlling Interest           97.50%        
Percentage of Income (Loss), Gain, Deduction and Credit Allocated to Controlling Interests           1.00%        
Percentage of Income (Loss), Gain, Deduction and Credit Allocated to Controlling Interests, PTCs Not Available           95.00%        
Opal Geo LLC [Member] | Scenario, Forecast [Member]                    
Percentage of Income (Loss), Gain, Deduction and Credit Allocated to Controlling Interests 95.00%                  
Opal Geo LLC [Member] | Capital Unit, Class A [Member]                    
Percentage Of Ownership Interests           100.00%        
Opal Geo LLC [Member] | JPM Capital Corporation [Member]                    
Proceeds from Noncontrolling Interests           $ 62,100        
Percentage Of Distributable Cash to Nontrolling Interests           2.50%        
Percentage of Income (Loss), Gain, Deduction and Credit Allocated to Noncontrolling Interests           99.00%        
Percentage of Income (Loss), Gain, Deduction and Credit Allocated to Noncontrolling Interests, PTCs Not Available           5.00%        
Opal Geo LLC [Member] | JPM Capital Corporation [Member] | Liability for Sale of Tax Benefit [Member]                    
Proceeds from Noncontrolling Interests           $ 58,500        
Opal Geo LLC [Member] | JPM Capital Corporation [Member] | Noncontrolling Interest [Member]                    
Proceeds from Noncontrolling Interests           $ 3,700        
Opal Geo LLC [Member] | JPM Capital Corporation [Member] | Scenario, Forecast [Member]                    
Proceeds from Noncontrolling Interests                   $ 21,000
Percentage Of Distributable Cash to Nontrolling Interests 100.00%                  
Percentage of Income (Loss), Gain, Deduction and Credit Allocated to Noncontrolling Interests 5.00%                  
Opal Geo LLC [Member] | JPM Capital Corporation [Member] | Capital Unit, Class B [Member]                    
Percentage of Equity Interest Sold           100.00%        
Ormat Nevada, OPC LLC [Member] | OPC Transaction [Member]                    
Payments to Acquire Additional Interest in Subsidiaries       $ 1,900            
Ormat Nevada ORTP LLC [Member] | ORTP Transaction [Member]                    
Payments to Acquire Interest in Joint Venture         $ 2,400          
DAC 2 [Member]                    
Percentage Of Ownership Interests           63.25%        
Other Geothermal Power Plants [Member]                    
Percentage Of Ownership Interests           100.00%        
OPC LLC [Member] | JPM Capital Corporation [Member] | Capital Unit, Class B [Member]                    
Fair Value of Equity Interest Sold           $ 3,000