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Note 5 - Fair Value of Financial Instruments (Tables)
9 Months Ended
Sep. 30, 2014
Fair Value Disclosures [Abstract]  
Fair Value, by Balance Sheet Grouping [Table Text Block]
    Carrying        
    value at         
    September 30,     

Fair Value at September 30, 2014

 
    2014    

Total

   

Level 1

   

Level 2

   

Level 3

 
                                         
   

(Dollars in thousands)

 

Assets

                                       

Current assets:

                                       

Cash equivalents (including restricted cash accounts)

  $ 116,118     $ 116,118     $ 116,118     $     $  

Derivatives:

                                       

Swap transaction on oil price(1)

    1,134       1,134             1,134        

Swap transaction on natural gas price(2)

    502       502             502        

Liabilities:

                                       

Current liabilities:

                                       

Currency forward contracts(3)

    (2,183 )     (2,183 )           (2,183 )      
    $ 115,571     $ 115,571     $ 116,118     $ (547 )   $  
    Carrying        
    value at        
    December 31,     

Fair Value at December 31, 2013

 
    2013    

Total

   

Level 1

   

Level 2

   

Level 3

 
                                         
   

(Dollars in thousands)

 

Assets

                                       

Current assets:

                                       

Cash equivalents (including restricted cash accounts)

  $ 40,015     $ 40,015     $ 40,015     $     $  

Derivatives:

                                       

Currency forward contracts(3)

    2,290       2,290             2,290        

Liabilities

                                       

Current liabilities:

                                       

Derivatives:

                                       

Swap transaction on oil price(1)

    (2,490 )     (2,490 )           (2,490 )      

Swap transaction on natural gas price(2)

    (341 )     (341 )           (341 )      
    $ 39,474     $ 39,474     $ 40,015     $ (541 )   $  
Derivative Instruments, Gain (Loss) [Table Text Block]

 

 

 

 

Amount of recognized gain (loss)

 
Derivatives not designated 
as hedging instruments
  Location of recognized gain (loss)  

Three Months Ended

September 30,

   

Nine Months Ended

September 30,

 
       

2014

   

2013

   

2014

   

2013

 
                                     
       

(Dollars in thousands)

   

(Dollars in thousands)

 
                                     

Put options on oil price

 

Electricity revenues

  $     $ (824 )   $     $ (1,256 )

Swap transaction on oil price

 

Electricity revenues

    1,657             1,885       (294 )

Swap transaction on natural gas price

 

Electricity revenues

    2,295       477       (609 )     81  
Currency forward contracts  

Foreign currency translation and transaction gains (losses)

    (2,422 )     1,970       (2,430 )     4,895  
        $ 1,530     $ 1,623     $ (1,154 )   $ 3,426  
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]
   

Fair Value

   

Carrying Amount

 
   

September 30,

2014

   

December 31,

2013

   

September 30,

2014

   

December 31,

2013

 
                                 
   

(Dollars in millions)

   

(Dollars in millions)

 

Olkaria III loan - DEG

  $ 36.6     $ 40.3     $ 35.5     $ 39.5  

Olkaria III loan - OPIC

    276.8       279.6       287.1       299.9  

Amatitlan loan

          34.8             31.5  

Senior secured notes:

                               

Ormat Funding LLC ("OFC")

    78.0       83.5       72.5       90.8  

OrCal Geothermal LLC ("OrCal")

    64.3       65.8       63.2       66.2  

OFC 2 LLC ("OFC 2")

    233.9       119.0       274.5       144.4  

Senior unsecured bonds

    264.9       270.6       250.4       250.6  

Loans from institutional investors

    14.2       20.1       13.9       19.5  
Fair Value, Liabilities Measured on Recurring and Nonrecurring Basis [Table Text Block]
   

Level 1

   

Level 2

   

Level 3

   

Total

 
   

(Dollars in millions)

 

Olkaria III loan - DEG

  $     $     $ 36.6     $ 36.6  

Olkaria III loan - OPIC

                276.8       276.8  

Senior secured notes:

                               

OFC

                78.0       78.0  

OrCal

                64.3       64.3  

OFC 2

                233.9       233.9  

Senior unsecured bonds

                264.9       264.9  

Loan from institutional investors

                14.2       14.2  

Other long-term debt

          15.0             15.0  

Revolving lines of credit

          28.1             28.1  

Deposits

    21.7                   21.7  
   

Level 1

   

Level 2

   

Level 3

   

Total

 
   

(Dollars in millions)

 

Olkaria III loan - DEG

  $     $     $ 40.3     $ 40.3  

Olkaria III loan - OPIC

                279.6       279.6  

Amatitlan loan

                34.8       34.8  

Senior secured notes:

                               

OFC

          83.5             83.5  

OrCal

                65.8       65.8  

OFC 2

                119.0       119.0  

Senior unsecured bonds

                270.6       270.6  

Loan from institutional investors

                20.1       20.1  

Other long-term debt

          23.3             23.3  

Revolving lines of credit

          112.0             112.0  

Deposits

    21.3                   21.3