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Note D - Product Warranties (Tables)
3 Months Ended
Mar. 31, 2015
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
   
March 31,
 
(Dollars in thousands)
 
2015
   
2014
 
Balance at beginning of year
  $ 1,166     $ 1,170  
Provision
  185     488  
Claims
  (280 )   (486 )
Balance at end of period
  $ 1,071     $ 1,172