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Note C - Product Warranties (Tables)
6 Months Ended
Jun. 30, 2013
Product Warranty Disclosure [Text Block]  
Schedule of Product Warranty Liability [Table Text Block]

(Thousands of dollars)

 

June 30,

 
   

2013

   

2012

 

Balance at beginning of year

  $ 1,133     $ 1,228  

Provision

    676       443  

Claims

    (644 )     (678 )

Balance at end of period

  $ 1,165     $ 993