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Note G - Treasury Stock (Details Textual) - USD ($)		3 Months Ended						9 Months Ended
	Jun. 11, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	May 13, 2019	Dec. 31, 2018	Apr. 30, 2017
Treasury Stock, Value, Acquired, Cost Method		$ 174,000	$ 11,823,000	$ 1,618,000	$ 2,720,000	$ 7,495,000	$ 36,000
Treasury Stock, Shares, Ending Balance		5,894,803						5,894,803		5,655,586
Treasury Stock, Value, Ending Balance		$ 156,167,000						$ 156,167,000		$ 142,552,000
September 2011 Reauthorization [Member]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased											500,000
Treasury Stock, Shares, Acquired								46,474
Treasury Stock, Value, Acquired, Cost Method								$ 1,974,000
May 2019 Tender Offer [Member]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased									200,000
Treasury Stock, Shares, Acquired	192,743
Treasury Stock, Value, Acquired, Cost Method	$ 11,600,000
Treasury Stock Acquired, Average Cost Per Share	$ 60
May 2019 Tender Offer [Member] | Maximum [Member]
Stock Repurchase Program, Price Per Share									$ 60
May 2019 Tender Offer [Member] | Minimum [Member]
Stock Repurchase Program, Price Per Share									$ 55

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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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Number of shares that have been repurchased during the period and are being held in treasury.

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The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.

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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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