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Note 6 - Long-term Debt (Tables)
 12 Months Ended
Dec. 31, 2014
Disclosure Text Block [Abstract]  
Schedule of Long-term Debt Instruments [Table Text Block]
   

2014

   

2013

 
   

(in thousands)

 

Line of credit with a bank—due July 1, 2016, and collateralized by accounts receivable (1)

  $ -     $ -  

Equipment financing (2)

    95,201       110,469  

Total long-term debt

    95,201       110,469  

Less current maturities

    (42,908 )     (40,103 )
                 

Long-term debt—net of current maturities

  $ 52,293     $ 70,366  
Schedule of Maturities of Long-term Debt [Table Text Block]
   

(in thousands)

 
         

2015

  $ 42,908  

2016

    26,779  

2017

    9,995  

2018

    9,363  

2019

    6,156  
         

Total

  $ 95,201