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Note D - Stock Based Compensation (Details) - Employee Stock Option Activity (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Employee Stock Option Activity [Abstract]    
Outstanding-January 1, 2014 164,098  
Outstanding-January 1, 2014 $ 10.99  
Exercised (19,050) 0
Exercised $ 9.81  
Cancelled/forfeited/expired (42)  
Cancelled/forfeited/expired $ 11.22  
Outstanding at March 31, 2014 145,006  
Outstanding at March 31, 2014 $ 11.15  
Outstanding at March 31, 2014 6 years  
Outstanding at March 31, 2014 $ 1,266,412 [1]  
Exercisable at March 31, 2014 76,992  
Exercisable at March 31, 2014 $ 11.31  
Exercisable at March 31, 2014 4 years 146 days  
Exercisable at March 31, 2014 $ 659,747 [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 March 31, 2014, was $19.88.