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Note 8 - Long-term Debt (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Long-term Debt Instruments [Table Text Block]
   
December 31,
 
   
2018
   
2017
 
                 
Variable interest rate term notes
  $
80,355
    $
96,157
 
Fixed interest rate term notes
   
520,818
     
515,371
 
                 
Total debt
   
601,173
     
611,528
 
                 
Less: current maturities
   
(161,955
)    
(145,139
)
                 
Total long-term debt, net of current maturities
  $
439,218
    $
466,389
 
Schedule of Maturities of Long-term Debt [Table Text Block]
2019
  $
161,955
 
2020
   
158,815
 
2021
   
103,938
 
2022
   
88,155
 
2023
   
57,689
 
Thereafter
   
30,621
 
         
Total
  $
601,173