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Note D - Product Warranties (Tables)
3 Months Ended
Mar. 31, 2016
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
   
March 31,
 
(Dollars in thousands)
 
2016
   
2015
 
Balance at beginning of year
  $ 1,380     $ 1,166  
Provision
    269       185  
Claims
    (402 )     (280 )
Balance at end of period
  $ 1,247     $ 1,071