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Note D - Product Warranties (Tables)
6 Months Ended
Jun. 30, 2014
Product Warranties Disclosures [Abstract]  
Schedule of Product Warranty Liability [Table Text Block]

(Thousands of dollars)

 

June 30,

 
   

2014

   

2013

 

Balance at beginning of year

  $ 1,170     $ 1,133  

Provision

    811       676  

Claims

    (862 )     (644 )

Balance at end of period

  $ 1,119     $ 1,165