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Note F - Income Taxes (Detail) - Reconciliation of the Beginning and Ending Amount Of Unrecognized Tax Benefits (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Balance at beginning of year $ 1,423,000 $ 1,298,000 $ 1,461,000
Additions based on tax positions related to the current year 68,000 132,000 106,000
(Reduction) additions for tax positions of prior years (1,000) 117,000 149,000
Reductions due to lapse of applicable statute of limitations (131,000) (124,000) (157,000)
Settlements (938,000)   (261,000)
Balance at end of year $ 421,000 $ 1,423,000 $ 1,298,000