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Note D - Stock-based Compensation - Stock Option Activity (Details)
 9 Months Ended
Sep. 30, 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 3 years 182 days
Outstanding | $ $ 527,714 [1]
Exercisable at September 30, 2016 (in shares) | shares 44,798
Exercisable at September 30, 2016 (in dollars per share) | $ / shares $ 10.85
Exercisable at September 30, 2016 2 years 328 days
Exercisable at September 30, 2016 | $ $ 410,978 [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 September 30, 2016, was $20.02.