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Note A - Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2016
Notes Tables  
Property, Plant and Equipment, Useful Lives [Table Text Block]
    Years
Buildings    
20
-
50
  
Machinery and equipment
    
5
-
15
  
Software
    
3
-
5
  
Property, Plant and Equipment [Table Text Block]
   
2016
    
2015
  
Land
   $
4,099
     $
3,736
  
Buildings
    
104,952
      
104,128
  
Machinery and equipment
    
165,157
      
163,875
  
     
274,208
      
271,739
  
Less accumulated depreciation
    
(152,141
 )    
(141,852
 )
Property, plant and equipment, net
   $
122,067
     $
129,887
  
Schedule of Finite-Lived Intangible Assets [Table Text Block]
    Years
Technology and drawings    
13
-
20
  
Customer relationships
    
9
-
15
  
Other intangibles
    
2
-
18
  
Schedule of Product Warranty Liability [Table Text Block]
   
2016
    
2015
    
2014
  
Balance at beginning of year
   $
1,380
     $
1,166
     $
1,170
  
Provision
    
1,991
      
1,732
      
1,607
  
Claims
    
(1,936
 )    
(1,518
 )    
(1,611
 )
Balance at end of year
   $
1,435
     $
1,380
     $
1,166