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Note 5 - Property, Plant and Equipment (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Property, Plant and Equipment [Table Text Block]
    December 31
,
  
   
201
7
    
201
6
  
Lan
d
   $
3,635
     $
4,485
  
Buildings, improvements and leasehold
s
    
18,192
      
19,140
  
Machinery, equipment and fixture
s
    
52,594
      
48,840
  
     
74,421
      
72,465
  
Accumulated depreciation and amortizatio
n
    
(47,577
 )    
(44,932
 )
    $
26,844
     $
27,533