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Note 11 - Income Taxes (Details) (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Note 11 - Income Taxes (Details) [Line Items]      
Effective Income Tax Rate Reconciliation, Percent 22.30% 268.50%  
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 35.00%    
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Amount (in Dollars) $ 1,019,000 $ 951,000  
Deferred Tax Assets, Investments (in Dollars)     700,000
Deferred Tax Assets, Tax Credit Carryforwards, General Business (in Dollars)     71,300,000
Internal Revenue Service (IRS) [Member]
      
Note 11 - Income Taxes (Details) [Line Items]      
Operating Loss Carryforwards (in Dollars)   235,400,000  
State and Local Jurisdiction [Member]
      
Note 11 - Income Taxes (Details) [Line Items]      
Operating Loss Carryforwards (in Dollars)   $ 218,100,000  
Israel [Member] | Investment One [Member] | Ormat Systems Ltd Member
      
Note 11 - Income Taxes (Details) [Line Items]      
Period For Tax Exemption 2 years    
Income Tax Incentive Period 5 years    
Israel [Member] | Investment One [Member] | Ormat Systems Ltd Member | Maximum [Member]
      
Note 11 - Income Taxes (Details) [Line Items]      
Effective Income Tax Rate 25.00%    
Israel [Member] | Investment Two [Member] | Ormat Systems Ltd Member
      
Note 11 - Income Taxes (Details) [Line Items]      
Period For Tax Exemption 2 years    
Income Tax Incentive Period 5 years    
Israel [Member] | Investment Two [Member] | Ormat Systems Ltd Member | Maximum [Member]
      
Note 11 - Income Taxes (Details) [Line Items]      
Effective Income Tax Rate 25.00%    
Israel [Member] | Ormat Systems Ltd Member
      
Note 11 - Income Taxes (Details) [Line Items]      
Effective Income Tax Rate Year One and Year Two 15.00%    
Effective Income Tax Rate Year Three and Year Four 12.50%    
Effective Income Tax Rate Year Five and Thereafter 12.00%    
Investment Tax Credit Carryforward [Member]
      
Note 11 - Income Taxes (Details) [Line Items]      
Tax Credit Carryforward Expiration Period     20 years
General Business Tax Credit Carryforward [Member]
      
Note 11 - Income Taxes (Details) [Line Items]      
Tax Credit Carryforward Expiration Period     20 years