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Note 6 - Property and Equipment (Tables)
12 Months Ended
Dec. 31, 2018
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
December 31,
 
   
2018
   
2017
 
                 
Land and improvements
  $
22,940
    $
20,185
 
Buildings
   
40,477
     
30,301
 
Machinery and equipment
   
112,884
     
100,438
 
Equipment under capital lease
   
1,683
     
1,171
 
     
177,984
     
152,095
 
Less accumulated depreciation and amortization
   
(76,861
)    
(74,311
)
     
101,123
     
77,784
 
Construction in progress
   
2,324
     
972
 
Property and equipment, net
  $
103,447
    $
78,756