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Note G - Treasury Stock (Details Textual) - USD ($)	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Dec. 31, 2019	Apr. 30, 2017
Treasury Stock, Value, Acquired, Cost Method	$ (0)	$ 321,000	$ 11,823,000	$ 1,618,000
Treasury Stock, Shares, Ending Balance (in shares)	5,916,438				5,916,438	5,907,263
Treasury Stock, Value, Ending Balance	$ 157,158,000				$ 157,158,000	$ 156,837,000
September 2011 Reauthorization [Member]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased (in shares)							500,000
Treasury Stock, Shares, Acquired (in shares)					9,175
Treasury Stock, Value, Acquired, Cost Method					$ 321,000

X

- Definition

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

+ References

No definition available.

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- Definition

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.

+ References

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

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- Definition

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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