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Note 7 - Fair Value Measurements (Tables)
3 Months Ended
Mar. 31, 2015
Fair Value Disclosures [Abstract]  
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]

Fair Value at March 31, 2015

 

Level 1

   

Level 2

   

Level 3

 

Measured on a recurring basis:

                       

Derivative contracts, net

  $ -     $ (1,488 )   $ -  
                         

Measured on a non-recurring basis:

                       

Equity-method investment

  $ -     $ -     $ 39,871  

Fair Value at December 31, 2014

 

Level 1

   

Level 2

   

Level 3

 

Measured on a recurring basis:

                       

Derivative contracts, net

  $ -     $ (1,750 )   $ -  
                         

Measured on a non-recurring basis:

                       

Equity-method investment

  $ -     $ -     $ 33,282  
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]
   

March 31,
201
5

   

December 31,

2014

 

Carrying value

  $ 312,790     $ 257,780  

Fair value

    312,097       270,781