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Note 2 - Business Acquisitions and Others (Details Textual)
€ in Millions, shares in Millions
 1 Months Ended 10 Months Ended 12 Months Ended
Jul. 26, 2017
shares
Mar. 15, 2017
USD ($)
Jul. 31, 2016
USD ($)
MWh
Jul. 31, 2016
EUR (€)
MWh
Dec. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Goodwill         $ 21,037,000 $ 21,037,000 $ 6,650,000  
Payments to Acquire Businesses, Net of Cash Acquired           35,300,000 20,135,000
Payments for Achievement of Production Goal           8,032,000
Redeemable Noncontrolling Interest, Equity, Carrying Amount         11,081,000  
Stockholders' Equity Attributable to Noncontrolling Interest         84,322,000 84,322,000 $ 91,582,000  
Viridity Energy, Inc. [Member]                
Business Combination, Consideration Transferred   $ 35,300,000            
Business Combination, Contingent Consideration, Liability   12,400,000     10,300,000 $ 10,300,000    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill   $ 34,700,000            
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   19 years       19 years    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Working Capital   $ 400,000            
Goodwill   $ 13,400,000            
Viridity Energy, Inc. [Member] | General and Administrative Expense [Member]                
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability         (600,000)      
Geothermie Bouillante SA (“GB”) [Member]                
Goodwill     $ 7,100,000          
Expected Power Generating Capacity | MWh     14.75 14.75        
Business Acquisition, Percentage of Voting Interests Acquired     60.00%          
Payments to Acquire Businesses, Net of Cash Acquired     $ 20.60          
Payments to Acquire Businesses, Additional Amount Subject to Achievement of Agreed upon Production Thresholds     $ 13,400,000     $ 3,600,000    
Payments for Achievement of Production Goal           8,000,000    
Power Purchase Agreements Term     15 years 15 years        
Redeemable Noncontrolling Interest, Equity, Carrying Amount         5,000,000 5,000,000    
Stockholders' Equity Attributable to Noncontrolling Interest         $ 8,300,000 $ 8,300,000    
Geothermie Bouillante SA (“GB”) [Member] | Service Agreements [Member]                
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles     $ 33,000,000          
Geothermie Bouillante SA (“GB”) [Member] | After Further Invest in Two Years [Member]                
Payments to Acquire Additional Interest in Subsidiaries     $ 8,400,000 € 7.5        
Business Combination, Expected Ownership Interest     63.75%          
Geothermie Bouillante SA (“GB”) [Member] | Ormat Systems LTD and Caisse des Depots et Consignations (CDC) [Member]                
Business Acquisition, Percentage of Voting Interests Acquired     80.00%          
Business Combination, Co-acquisition, Percentage of Ownership Interest Allocated     75.00%          
Geothermie Bouillante SA (“GB”) [Member] | Caisse des Depots et Consignations (CDC) [Member]                
Business Combination, Co-acquisition, Percentage of Ownership Interest Allocated     25.00%          
ORIX Corporation [Member]                
Number of Shares Purchased by Investor | shares 11              
Percentage Ownership in Company Purchased by Investor 22.00%              
Voting Rights, Number of Directors Designated 3              
Number of Directors after Acquisition Transaction 9              
Voting Rights, Effective Rate Cap 25.00%