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Note D - Product Warranties (Tables)
9 Months Ended
Sep. 30, 2016
Notes Tables  
Schedule of Product Warranty Liability [Table Text Block]
   
September 30,
 
(Dollars in thousands)
 
2016
   
2015
 
Balance at beginning of year
  $ 1,380     $ 1,166  
Provision
    1,572       1,104  
Claims
    (1,418 )     (1,003 )
Balance at end of period
  $ 1,534     $ 1,267