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Note 7 - Capital Leased Assets (Tables)
 9 Months Ended
Sep. 30, 2018
Notes Tables  
Schedule of Capital Leased Assets [Table Text Block]
   
September 30,
    
December 31,
  
   
2018
    
2017
  
Leased property under capital leases
   $
11,553
     $
11,361
  
Less accumulated amortization
    
(5,355
 )    
(5,001
 )
Leased property under capital leases, net
   $
6,198
     $
6,360