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Note D - Stock Based Compensation (Details) - Employee Stock Option Activity (USD $)
 6 Months Ended
Jun. 30, 2014
Employee Stock Option Activity [Abstract]  
Outstanding-beginning of year 164,098
Outstanding-beginning of year $ 10.99
Exercised (43,967)
Exercised $ 10.53
Cancelled/forfeited/expired (42)
Cancelled/forfeited/expired $ 11.22
Outstanding at June 30, 2014 120,089
Outstanding at June 30, 2014 $ 11.16
Outstanding at June 30, 2014 5 years 6 months
Outstanding at June 30, 2014 $ 2,017,494 [1]
Exercisable at June 30, 2014 65,875
Exercisable at June 30, 2014 $ 11.31
Exercisable at June 30, 2014 3 years 292 days
Exercisable at June 30, 2014 $ 1,096,704 [1]
[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, 2014, was $27.96.