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Note 9 - Fair Value of Financial Instruments (Tables)
3 Months Ended
Mar. 31, 2017
Notes Tables  
Fair Value, by Balance Sheet Grouping [Table Text Block]
 
 
March 31,
2017
 
 
December 31,
2016
 
   
(unaudited)
         
Carrying amount (excluding unamortized debt issuance costs)
  $
764,348
    $
764,593
 
Fair value
  $
751,016
    $
749,324