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Note 9 - Equity-Method Investment (Tables)
9 Months Ended
Sep. 30, 2016
Consolidated Statement of Operations [Member]  
Notes Tables  
Equity Method Investments [Table Text Block]
 
 
Three Months Ended
September 30,
 
 
Nine Months Ended
September 30,
 
 
 
2016
 
 
2015
 
 
2016
 
 
2015
 
Asset impairments to write investment down to fair value
  $ 3,498     $ 4,131     $ 10,494     $ 12,391  
Our portion of the partnership’s operating losses
    2,066       1,731       6,197       5,196  
Non-cash interest expense related to the amortization of the discounted fair value of future equity contributions
    31       155       185       549  
Tax benefits and credits generated
    7,592       7,414       20,374       22,316  
Consolidated Balance Sheet [Member]  
Notes Tables  
Equity Method Investments [Table Text Block]
 
 
September 30,
2016
 
 
December 31,
2015
 
Carrying value, recorded as a component of other non-current assets
  $ 5,594     $ 22,284  
Present value of obligation associated with future equity contributions, recorded as a component of accrued liabilities
    5,674       22,511