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Note 9 - Property, Plant and Equipment and Construction-in-process (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 26, 2014
Dec. 02, 2013
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Note 9 - Property, Plant and Equipment and Construction-in-process (Details) [Line Items]              
Depreciation         $ 95,151,000 $ 87,851,000 $ 91,791,000
Depreciation, Net of Amortization of Cash Grant         5,539,000 5,318,000 4,330,000
Property Plant and Equipment Including Construction-in-Progress, Net         1,335,043,000 1,327,356,000  
Property, Plant and Equipment, Cash Grant, Net         $ 144,246,000 149,785,000  
Proceeds from Sales of Business, Affiliate and Productive Assets           35,250,000 $ 7,699,000
Kenya Power And Lighting Co Limited [Member]              
Note 9 - Property, Plant and Equipment and Construction-in-process (Details) [Line Items]              
Power Purchase Agreements Term         20 years    
Foreign Countries [Member]              
Note 9 - Property, Plant and Equipment and Construction-in-process (Details) [Line Items]              
Property Plant and Equipment Including Construction-in-Progress, Net         $ 473,127,000 $ 407,003,000  
Heber Solar Project [Member]              
Note 9 - Property, Plant and Equipment and Construction-in-process (Details) [Line Items]              
Sales Price of Disposition $ 35,250,000            
Proceeds from Sales of Business, Affiliate and Productive Assets     $ 20,250,000 $ 15,000,000      
Gain (Loss) on Sale of Project     $ 7,600,000        
Nacional de Electrificacion (INDE) [Member] | Zunil Power Plant [Member]              
Note 9 - Property, Plant and Equipment and Construction-in-process (Details) [Line Items]              
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners           3.00%  
Orzunil I de Electricidad, Limitada [Member]              
Note 9 - Property, Plant and Equipment and Construction-in-process (Details) [Line Items]              
Property Plant and Equipment Including Construction-in-Progress, Net         19,205,000 $ 19,141,000  
Ortitlan, Limitada [Member]              
Note 9 - Property, Plant and Equipment and Construction-in-process (Details) [Line Items]              
Property Plant and Equipment Including Construction-in-Progress, Net         46,035,000 45,624,000  
Ormat International [Member]              
Note 9 - Property, Plant and Equipment and Construction-in-process (Details) [Line Items]              
Property Plant and Equipment Including Construction-in-Progress, Net         19,900,000 12,300,000  
Royalty Rate   12.00%          
Property, Plant and Equipment Operating Period   15 years          
Power Plants [Member] | KENYA              
Note 9 - Property, Plant and Equipment and Construction-in-process (Details) [Line Items]              
Property Plant and Equipment Including Construction-in-Progress, Net         $ 355,754,000 $ 305,129,000