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Note 12 - Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2014
Fair Value Disclosures [Abstract]  
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]

Fair Value at December 31, 2014

 

Level 1

   

Level 2

   

Level 3

 

Measured on a recurring basis:

                       

Derivative contract, net

  $ -     $ (1,750 )   $ -  
                         

Measured on a non-recurring basis:

                       

Equity-method investment

  $ -     $ -     $ 33,282  

Fair Value at December 31, 2013

 

Level 1

   

Level 2

   

Level 3

 

Measured on a recurring basis:

                       

Derivative contract, net

  $ -     $ (2,900 )   $ -  
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]

December 31,

 

2014

   

2013

 

Carrying value

  $ 257,780     $ 132,616  

Fair value

    270,781       126,786