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Note 6 - Long-term Debt (Tables)
 12 Months Ended
Dec. 31, 2015
Notes Tables  
Schedule of Long-term Debt Instruments [Table Text Block]
 
 
2015
 
 
2014
 
 
 
(in thousands)
 
Line of credit with a bank—due July 1, 2017, and
collateralized by accounts receivable (1)
   $ 9,977     $ -  
Equipment financing (2)
     129,271       95,201  
Total long-term debt
     139,248       95,201  
Less current maturities
     (40,025 )     (42,908 )
                 
Long-term debt—net of current maturities
   $ 99,223     $ 52,293  
Schedule of Maturities of Long-term Debt [Table Text Block]
 
 
(in thousands)
 
         
2016
   $ 40,025  
2017
     36,999  
2018
     48,716  
2019
     11,217  
2020
     2,291  
         
Total
   $ 139,248