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Note C - Product Warranties (Tables)
3 Months Ended
Mar. 31, 2014
Product Warranties Disclosures [Abstract]  
Schedule of Product Warranty Liability [Table Text Block]

(Thousands of dollars)

 

March 31,

 
   

2014

   

2013

 

Balance at beginning of year

  $ 1,170     $ 1,133  

Provision

    488       354  

Claims

    (486 )     (324 )

Balance at end of period

  $ 1,172     $ 1,163