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Note B - Inventories (Tables)
3 Months Ended
Mar. 31, 2014
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block]

(Thousands of dollars)

 

March 31,

2014

   

December 31,

2013

 

Raw materials and in-process

  $ 22,769     $ 26,877  

Finished parts

    39,995       46,491  

Finished products

    26,169       16,578  

Total inventories

  $ 88,933     $ 89,946