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Note C - Product Warranties (Detail) - Product Warranties (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Balance at beginning of year $ 1,133 $ 1,228
Provision 354 86
Claims (324) (311)
Balance at end of period $ 1,163 $ 1,003