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Note 6 - Property and Equipment (Tables)
12 Months Ended
Dec. 31, 2017
Notes Tables  
Property, Plant and Equipment [Table Text Block]
   
December 31
,
 
   
201
7
   
201
6
 
                 
Land and improvement
s
  $
20,185
    $
19,787
 
Building
s
   
30,301
     
30,219
 
Machinery and equipmen
t
   
100,438
     
99,485
 
Equipment under capital leas
e
   
1,171
     
1,126
 
Construction in progres
s
   
972
     
531
 
     
153,067
     
151,148
 
Less accumulated depreciation and amortizatio
n
   
(74,311
)    
(69,477
)
Property and equipment, ne
t
  $
78,756
    $
81,671