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Note 7 - Capital Leased Assets (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Schedule of Capital Leased Assets [Table Text Block]
   
June 30,
   
December 31,
 
   
2018
   
2017
 
Leased property under capital leases
  $
11,537
    $
11,361
 
Less accumulated amortization
   
(5,226
)    
(5,001
)
Leased property under capital leases, net
  $
6,311
    $
6,360