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Note C - Marketable Equity Securities (Details) - Cost, Market Value and Unrealized Gain/(loss) on Equity Securities (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Available-for-sale securities
Fair market value	$ 19,299	$ 17,188
Cost	10,302	10,361
Unrealized gain	8,997	6,827
Trading securities
Fair market value	149	132
Cost	158	158
Unrealized loss	(9)	(26)
Total
Fair market value	19,448	17,320
Cost	10,460	10,519
Unrealized gain	$ 8,988	$ 6,801

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Amount of unrealized gain (loss) on investments in debt and equity securities classified as available-for-sale securities.

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Amount of investments in debt and equity securities, including, but not limited to, held-to-maturity, trading and available-for-sale expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer.

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The aggregate net change in the difference between the fair value and the carrying value, or in the comparative fair values, of marketable securities categorized as trading held at each balance sheet date, that was included in earnings for the period, which may have arisen from (a) securities classified as trading, (b) the unrealized holding gain (loss) on held-to-maturity securities transferred to the trading security category, and (c) the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) on available-for-sale securities transferred to trading securities during the period.

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