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Note C - Inventories (Tables)
3 Months Ended
Mar. 31, 2016
Notes Tables  
Schedule of Inventory, Current [Table Text Block]
   
March 31,
   
December 31,
 
(Dollars in thousands)
 
2016
   
2015
 
Raw materials and in-process
  $ 22,122     $ 25,652  
Finished parts
    45,472       46,270  
Finished products
    9,699       10,896  
Total inventories
  $ 77,293     $ 82,818