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Note D - Product Warranties (Tables)
6 Months Ended
Jun. 30, 2016
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
   
June 30,
 
(Dollars in thousands)
 
2016
   
2015
 
Balance at beginning of year
  $ 1,380     $ 1,189  
Provision
    1,160       734  
Claims
    (884 )     (727 )
Balance at end of period
  $ 1,656     $ 1,196