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Note 2 - Business Acquisitions and Others (Details Textual)
$ in Thousands
3 Months Ended 12 Months Ended
Jul. 02, 2019
USD ($)
Apr. 24, 2018
USD ($)
MWh
Mar. 15, 2017
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Payments to Acquire Equity Method Investments         $ 10,674 $ 3,800 $ 46,318
Goodwill, Ending Balance       $ 20,140 $ 20,140 19,950 21,037
U.S. Geothermal [Member]              
Payments to Acquire Businesses, Gross   $ 110,000          
Current Power Generation | MWh   38          
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual           21,400  
Business Acquisition, Pro Forma Operating Income (Loss) since Acquisition Date, Actual           2,500  
Business Combination, Consideration Transferred, Total   $ 110,000          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total [1]   127,000          
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Working Capital   (8,200)          
Goodwill, Ending Balance [2]   $ 12,700          
U.S. Geothermal [Member] | Long-term Electricity Power Purchase Agreements [Member]              
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   19 years          
Viridity Energy, Inc. [Member]              
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life     19 years   19 years    
Business Combination, Consideration Transferred, Total     $ 35,300        
Business Combination, Contingent Consideration, Liability, Total     12,400     $ 10,300 $ 600
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total     34,700        
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Working Capital     400        
Goodwill, Ending Balance     $ 13,500        
Neal Hot Springs [Member] | U.S. Geothermal [Member]              
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value   $ 34,900          
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Percent   40.00%          
Neal Hot Springs [Member] | U.S. Geothermal [Member] | Measurement Input, Expected Term [Member]              
Noncontrolling Interest, Measurement Input   20          
Neal Hot Springs [Member] | U.S. Geothermal [Member] | Measurement Input, Discount Rate [Member]              
Noncontrolling Interest, Measurement Input   0.09          
Subsidiary of Medco Power [Member] | Ijen Geothermal Project Company [Member]              
Ownership Percentage Of Common Shares Outstanding 51.00%            
Ormat Nevada Inc. [Member] | U.S. Geothermal [Member]              
Payments to Acquire Businesses, Gross   $ 106,000          
Heit vs Ormat Technologies, Inc. [Member] | U.S. Geothermal [Member]              
Payments to Acquire Businesses, Gross   $ 4,000          
Ijen Geothermal Project Company [Member]              
Equity Method Investment, Ownership Percentage 49.00%            
Payments to Acquire Equity Method Investments $ 2,700     $ 7,400      
[1] Intangible assets are primarily related to long-term electricity power purchase agreements and depreciated over an average of 19 years.
[2] Goodwill is primarily related to the expected synergies in operations as a result of the purchase transaction. The goodwill is allocated to the Electricity segment and not deductible for tax purposes.