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Note D - Stock-Based Compensation (Details) - Stock Option Activity - Jun. 30, 2015 - USD ($)
Total
Stock Option Activity [Abstract]  
Shares Under Option 66,548
Shares Under Option, Weighted-Average Exercise Price $ 10.92
Weighted-Average Remaining Contractual Term 4 years 255 days
Aggregate Intrinsic Value [1] $ 3,136,135
Exercisable at June 30, 2015 32,239
Exercisable at June 30, 2015 $ 10.88
Exercisable at June 30, 2015 2 years 6 months
Exercisable at June 30, 2015 [1] $ 1,520,612
Exercised (19,800)
Exercised $ 11.66
[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 June 30, 2015, was $58.05.