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Note 1 - Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2017
Notes Tables  
Property, Plant and Equipment, Useful Lives [Table Text Block]
Buildings
    
20
-
50
years
Machinery and equipment
    
5
-
15
years
Software
    
3
-
5 years
Property, Plant and Equipment [Table Text Block]
   
201
7
    
201
6
  
Land
   $
4,187
     $
4,099
  
Buildings
    
106,437
      
104,952
  
Machinery and equipment
    
170,615
      
165,157
  
     
281,239
      
274,208
  
Less accumulated depreciation
    
(164,168
 )    
(152,141
 )
Property, plant and equipment, net
   $
117,071
     $
122,067
  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
Technology and drawings
    
13
 -
20
years
Customer relationships
    
9
 -
15
years
Other intangibles
    
2
 -
18
years
Schedule of Product Warranty Liability [Table Text Block]
   
201
7
    
201
6
    
201
5
  
Balance at beginning of year
   $
1,435
     $
1,380
     $
1,166
  
Provision
    
1,377
      
1,991
      
1,732
  
Claims
    
(1,714
 )    
(1,936
 )    
(1,518
 )
Balance at end of year
   $
1,098
     $
1,435
     $
1,380