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Note 7 - Long-term Debt (Tables)
12 Months Ended
Dec. 31, 2019
Notes Tables  
Schedule of Long-term Debt Instruments [Table Text Block]
   
201
9
   
201
8
 
   
(in thousands)
 
Line of credit with a bank—due July 1, 2022, and collateralized by accounts receivable (1)
   
17,047
     
10,192
 
Equipment financing (2)
   
224,777
     
211,031
 
Total long-term debt
   
241,824
     
221,223
 
Less current maturities
   
(67,637
)    
(63,908
)
                 
Long-term debt—net of current maturities
  $
174,187
    $
157,315
 
Schedule of Maturities of Long-term Debt [Table Text Block]
2020
  $
67,637
 
2021
   
41,629
 
2022
   
55,460
 
2023
   
47,211
 
2024
   
26,157
 
2025
   
2,955
 
2026
   
775
 
         
Total
  $
241,824