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Note 4 - Unconsolidated Investments (Details Textual)
$ in Thousands
3 Months Ended
Jun. 04, 2014
USD ($)
Mar. 31, 2017
USD ($)
MWh
Mar. 31, 2016
USD ($)
May 23, 2014
USD ($)
May 16, 2014
USD ($)
Oct. 31, 2013
USD ($)
Number of Commercial Lenders in Funding Consortium         6  
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax   $ 569 $ (3,179)      
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest   39,735 30,945      
Intersegment Eliminations [Member]            
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest   $ 13,700        
Sarulla [Member] | Lenders Consortium [Member]            
Senior Notes         $ 1,170,000  
Sarulla [Member]            
Jointly Owned Utility Plant, Proportionate Ownership Share   12.75%        
Expected Power Generating Capacity | MWh   330        
Contract Effective Date   April 4, 2013        
Power Plant Usage Agreement Term   30 years        
Number Of Phases Of Construction   3        
Power Utilization | MWh   110        
Percentage of Required Production Capacity   100.00%        
Percentage of Required Injection Capacity   65.00%        
Supply Commitment, Remaining Minimum Amount Committed           $ 255,600
Payments to Acquire Projects   $ 14,900        
Accumulated Cash Contributions to Acquire Projects   26,900        
Sarulla [Member] | Interest Rate Swap [Member]            
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax   600 3,200      
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax   (5,300)        
Sarulla [Member] | Interest Rate Swap [Member] | Sarulla Project Company [Member]            
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax   $ 4,500 $ (24,900)      
Sarulla [Member] | Lenders Consortium [Member] | Interest Rate Swap [Member]            
Proceeds from Issuance of Senior Long-term Debt $ 50,000          
Sarulla [Member] | Lenders Consortium [Member] | Interest Rate Swap [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument, Basis Spread on Variable Rate 3.4565%          
Sarulla [Member] | Lenders Consortium [Member] | Subject to Fixed Interest Rate [Member]            
Senior Notes       $ 100,000    
Sarulla [Member] | Lenders Consortium [Member] | Subject to Fixed LIBOR Interest Rate [Member]            
Senior Notes       $ 1,070,000    
Sarulla [Member] | Lenders Consortium [Member] | Subject to Fixed LIBOR Interest Rate [Member] | Interest Rate Swap [Member]            
Senior Notes $ 960,000