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Note B - Inventories (Tables)
9 Months Ended
Sep. 30, 2013
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]

(Thousands of dollars)

 

September 30,

2013

   

December 31,

2012

 

Raw materials and in-process

  $ 19,036     $ 23,967  

Finished parts

    45,903       52,607  

Finished products

    16,208       14,324  

Total inventories

  $ 81,147     $ 90,898