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Note G - Treasury Stock (Details Textual) - USD ($)			3 Months Ended				9 Months Ended
	Aug. 31, 2021	Jul. 27, 2021	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Dec. 31, 2020	Apr. 30, 2017
Treasury Stock, Value, Acquired, Cost Method			$ 10,684,000	$ 144,000	$ 1,472,000	$ 321,000
Treasury Stock, Shares, Ending Balance (in shares)			12,226,785				12,226,785	11,935,648
Treasury Stock, Value, Ending Balance			$ 169,946,000				$ 169,946,000	$ 159,118,000
September 2011 Reauthorization [Member]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares)									500,000
Treasury Stock, Shares, Acquired (in shares)							18,732
Treasury Stock, Value, Acquired, Cost Method							$ 647,000
The 2021 Tender Offer [Member]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares)		200,000
Treasury Stock, Shares, Acquired (in shares)	272,405
Treasury Stock, Value, Acquired, Cost Method	$ 10,100,000
Treasury Stock Acquired, Average Cost Per Share (in dollars per share)	$ 37.00
Treasury Stock, Shares, Acquired, Portion Oversubscribed (in shares)	72,405
The 2021 Tender Offer [Member] | Maximum [Member]
Treasury Stock Acquired, Average Cost Per Share (in dollars per share)		$ 37.00
The 2021 Tender Offer [Member] | Minimum [Member]
Treasury Stock Acquired, Average Cost Per Share (in dollars per share)		$ 32.00

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- Definition

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The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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