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Note D - Stock Option Activity (Details)
 3 Months Ended
Mar. 31, 2016
USD ($)
$ / shares
shares
Outstanding (in shares) | shares 66,098
Outstanding (in dollars per share) | $ / shares $ 10.92
Exercised (in shares) | shares (6,450)
Exercised (in dollars per share) | $ / shares $ 11.50
Cancelled/forfeited/expired (in shares) | shares (2,050)
Cancelled/forfeited/expired (in dollars per share) | $ / shares $ 10.91
Outstanding (in shares) | shares 57,598
Outstanding (in dollars per share) | $ / shares $ 10.86
Outstanding 4 years
Outstanding | $ $ 1,148,621 [1]
Exercisable at March 31, 2016 (in shares) | shares 31,443
Exercisable at March 31, 2016 (in dollars per share) | $ / shares $ 10.82
Exercisable at March 31, 2016 2 years 109 days
Exercisable at March 31, 2016 | $ $ 628,314 [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, 2016, was $30.80.