Note D - Stock-Based Compensation (Details) - Stock Option Activity (USD $)	3 Months Ended
	Mar. 31, 2015		Dec. 31, 2014
Stock Option Activity [Abstract]
Shares Under Option	82,348		86,348
Shares Under Option, Weighted-Average Exercise Price	$ 10.94		$ 11.09
Weighted-Average Remaining Contractual Term	5 years 109 days
Aggregate Intrinsic Value	$ 3,815,593	[1]
Exercisable at March 31, 2015	34,239
Exercisable at March 31, 2015	$ 10.92
Exercisable at March 31, 2015	2 years 328 days
Exercisable at March 31, 2015	$ 1,586,926	[1]
Exercised	(4,000)
Exercised	$ 14.32

[1] The intrinsic value of a stock option is the amount by which the market value of the underlying stock exceeds the exercise price of the option. The per share market value of our common stock, as determined by the closing price on March 31, 2015, was $57.27.