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Note D - Product Warranties (Tables)
6 Months Ended
Jun. 30, 2015
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
   
June 30,
 
(Dollars in thousands)
 
2015
   
2014
 
Balance at beginning of year
  $ 1,189     $ 1,170  
Provision
    734       811  
Claims
    (727 )     (862 )
Balance at end of period
  $ 1,196     $ 1,119