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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, Total   113,400    
Royalty Cap Amount   1,900 1,800  
Royalty Cap Amount LIBOR Rate   900 800  
Operating Leases, Rent Expense, Total   500 400 400
Capital Leased Assets, Gross, Total   $ 7,600 $ 7,600 $ 7,600
Capital Lease, Period of Payments   5 years 5 years 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, Total   $ 54,200    
Geothermal Resource Agreement [Member]        
Royalty Expense   $ 19,400 $ 17,100 $ 15,400