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Note F - Warranty Obligations (Tables)
3 Months Ended
Mar. 31, 2013
Notes to Financial Statements  
Schedule of Changes in Warranty Obligations

   2013  2012
Accrued warranty obligations, January 1  $68,000   $92,000 
Actual warranty experience   (9,000)   (14,000)
Warranty provisions   9,000    14,000 
Accrued warranty obligations, March 31  $68,000   $92,000