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Note 5 - Variable Interest Entities (Tables)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Disclosure Of Variable Interest Entities [Abstract]    
Schedule of Variable Interest Entities [Table Text Block]
   

December 31, 2014

 
   

Project Debt

   

PPAs

 
   

(Dollars in thousands)

 

Assets:

               

Restricted cash and cash equivalents

  $ 87,832     $  

Other current assets

    72,091       4,496  

Unconsolidated investments

           

Property, plant and equipment, net

    1,160,559       178,783  

Construction-in-process

    161,534       472  

Other long-term assets

    51,264       (1 )
                 

Total assets

  $ 1,533,280     $ 183,750  
                 

Liabilities:

               

Accounts payable and accrued expenses

  $ 14,266     $ 2,990  

Long-term debt

    685,248        

Other long-term liabilities

    91,254       6,885  
                 

Total liabilities

  $ 790,768     $ 9,875  
   

December 31, 2013

 
   

Project Debt

   

PPAs

   

Less than Majority-

owned Subsidiary

 
   

(Dollars in thousands)

 

Assets:

                       

Restricted cash, cash equivalents and marketable securities

  $ 48,276     $     $  

Other current assets

    66,672       5,459        

Property, plant and equipment, net

    1,190,467       190,616        

Construction-in-process

    136,486       461       11,055  

Other long-term assets

    56,601       267        
                         

Total assets

  $ 1,498,502     $ 196,803     $ 11,055  
                         

Liabilities:

                       

Accounts payable and accrued expenses

  $ 16,087     $ 2,608     $  

Long-term debt

    632,906              

Other long-term liabilities

    103,538       5,948        
                         

Total liabilities

  $ 752,531     $ 8,556     $