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Note 22 - Transactions with Related Entities (Details) - USD ($)
1 Months Ended 12 Months Ended
Feb. 12, 2015
Apr. 01, 2009
Jul. 31, 2004
Dec. 31, 2015
Dec. 31, 2005
Feb. 11, 2015
Dec. 31, 2014
Note 22 - Transactions with Related Entities (Details) [Line Items]              
Due from Officers or Stockholders, Current       $ 0     $ 1,337,000
Common Stock, Shares, Outstanding (in Shares) 48,500,000     49,107,901   45,500,000 45,537,162
Sale of Stock, Consideration Received on Transaction $ 15,400,000            
Corporate Costs and Other       $ 10,000      
Other Research and Development Expense, Percentage       10.00%      
Lease Term         31 years    
London Interbank Offered Rate (LIBOR) [Member]              
Note 22 - Transactions with Related Entities (Details) [Line Items]              
Debt Instrument, Basis Spread on Variable Rate       1.00%      
July 2004 Rental Agreement [Member]              
Note 22 - Transactions with Related Entities (Details) [Line Items]              
Rental Expenses     $ 52,000        
Lease Term     25 years        
April 2009 Rental Agreement [Member]              
Note 22 - Transactions with Related Entities (Details) [Line Items]              
Rental Expenses   $ 77,000          
Ormat Industries Ltd. [Member]              
Note 22 - Transactions with Related Entities (Details) [Line Items]              
Percentage Of Public Float Before Transition To Noncontrolled Public Company           40.00%  
Percentage of Public Float after Transition to Noncontrolled Public Company 76.00%            
Share Exchange, Shares Granted Per Share (in Dollars per share) $ 0.2592            
Conversion of Stock, Shares Issued (in Shares) 30,200,000            
Stock Issued During Period, Shares, New Issues (in Shares) 3,000,000            
Common Stock, Shares, Outstanding (in Shares) 48,500,000         45,500,000  
Sale of Stock, Consideration Received on Transaction $ 15,400,000            
Ormat Industries Ltd. [Member] | Shares Issued to Self Deducted [Member]              
Note 22 - Transactions with Related Entities (Details) [Line Items]              
Conversion of Stock, Shares Issued (in Shares) 27,200,000            
Ormat Industries Ltd. [Member] | Sale of Stock Other Assets Received [Member]              
Note 22 - Transactions with Related Entities (Details) [Line Items]              
Sale of Stock, Consideration Received Per Transaction $ 600,000            
Ormat Industries Ltd. [Member] | Sale of Stock, Land and Buildings Received [Member]              
Note 22 - Transactions with Related Entities (Details) [Line Items]              
Sale of Stock, Consideration Received Per Transaction 12,100,000            
Ormat Industries Ltd. [Member] | Sale of Stock, Liabilities Assumed [Member]              
Note 22 - Transactions with Related Entities (Details) [Line Items]              
Sale of Stock, Consideration Received Per Transaction $ 500,000            
Minimum [Member] | Israeli Consumer Price Index [Member]              
Note 22 - Transactions with Related Entities (Details) [Line Items]              
Debt Instrument, Basis Spread on Variable Rate       4.00%