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Note 22 - Commitments and Contingencies (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 29, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Royalty Expense   $ 0 $ 0 $ 0
Letters of Credit Outstanding, Amount   277,700    
Letter Of Credit Fair Value Disclosure   0    
Recorded Unconditional Purchase Obligation   113,400    
Royalty Cap Amount   1,900 1,800  
Royalty Cap Amount LIBOR Rate   900 800  
Operating Leases, Rent Expense   500 400 $ 400
Capital Leased Assets, Gross   $ 7,600    
Capital Lease, Period of Payments       5 years
Former Local Sales Representative vs. Ormat [Member] | Pending Litigation [Member]        
Loss Contingency, Damages Sought, Value $ 4,800      
Loss Contingency, Additional Damages Sought for Ormat Geothermal Products Sales in Chile, Percent 3.75%      
Loss Contingency, Damages Sought, Ormat Geothermal Products Sales in Chile, Period 10 years      
Minimum [Member]        
Percentage For Royalty To Be Paid   3.50%    
Maximum [Member]        
Percentage For Royalty To Be Paid   5.00%    
Construction In Process [Member]        
Recorded Unconditional Purchase Obligation   $ 54,200    
Geothermal Resource Agreement [Member]        
Royalty Expense   $ 19,400 $ 17,100 $ 15,400