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Note 9 - Leases and Commitments (Tables)
6 Months Ended
Jun. 30, 2018
Notes Tables  
Lessee, Operating Lease, Disclosure [Table Text Block]
   
2018
   
2019
   
2020
   
2021
   
2022
   
Thereafter
 
Capital leases, including interest component
  $
5,228
    $
12,317
    $
16,050
    $
327
    $
327
    $
1,578
 
Operating leases
   
5,894
     
8,135
     
4,792
     
729
     
235
     
371
 
Schedule of Capital Leased Assets [Table Text Block]
   
Capitalized Costs
   
Accumulated Amortization
   
Net Book Value
 
June 30
, 2018
 
$
51,429
   
$
16,308
   
$
35,121
 
December 31, 2017
   
66,785
     
23,254
     
43,531