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Note 5 - Capital Leased Assets (Tables)
 9 Months Ended
Sep. 30, 2017
Notes Tables  
Schedule of Capital Leased Assets [Table Text Block]
   
September 30,
    
December 31,
  
   
2017
    
2016
  
Leased property under capital leases
   $
11,515
     $
10,783
  
Less accumulated amortization
    
(5,145
 )    
(4,748
 )
Leased property under capital leases, net
   $
6,370
     $
6,035