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Note 7 - Capital Leased Assets (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Schedule of Capital Leased Assets [Table Text Block]
   
2018
   
2017
 
Leased property under capital leases
  $
11,442
    $
11,361
 
Less accumulated amortization
   
(5,374
)    
(5,001
)
Leased property under capital leases, net
  $
6,068
    $
6,360