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Note 12 - Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2016
Notes Tables  
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]
Fair Value at December 31, 2015
 
Level 1
 
 
Level 2
 
 
Level 3
 
Measured on a recurring basis:
 
 
 
 
 
 
 
 
 
 
 
 
Derivative contract, net
  $
    $
532
    $
 
                         
Measured on a non-recurring basis:
 
 
 
 
 
 
 
 
 
 
 
 
Equity-method investment
  $
    $
    $
22,284
 
Long-lived assets held and used:
                       
Certain buildings and improvements
  $
    $
    $
6,559
 
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]
December 31,
 
2016
 
 
2015
 
Carrying value
  $
286,660
    $
297,463
 
Fair value
   
293,522
     
296,961