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Note 7 - Fair Value Measurements (Tables)
6 Months Ended
Jun. 30, 2016
Notes Tables  
Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]
Fair Value at June 30, 2016
 
Level 1
 
 
Level 2
 
 
Level 3
 
Measured on a
non-recurring basis:
 
 
 
 
 
 
 
 
 
 
 
 
Equity-method investment
  $     $     $ 11,157  
Fair Value at December 31, 2015
 
Level 1
 
 
Level 2
 
 
Level 3
 
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]
 
 
June 30, 2016
 
 
December 31, 2015
 
Carrying value
  $ 281,886     $ 297,463  
Fair value
    286,628       296,961