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Note E - Stock-based Compensation - Stock Option Activity (Details)
 9 Months Ended
Sep. 30, 2018
USD ($)
$ / shares
shares
Outstanding, shares (in shares) | shares 45,068
Outstanding, weighted-average exercise price (in dollars per share) | $ / shares $ 10.79
Granted, shares (in shares) | shares
Granted, weighted-average exercise price (in dollars per share) | $ / shares
Exercised, shares (in shares) | shares (45,005)
Exercised, weighted-average exercise price (in dollars per share) | $ / shares $ 10.79
Cancelled/forfeited/expired, shares (in shares) | shares (63)
Cancelled/forfeited/expired, weighted-average exercise price (in dollars per share) | $ / shares $ 10.90
Outstanding, shares (in shares) | shares
Outstanding, weighted-average exercise price (in dollars per share) | $ / shares
Outstanding, weighted-average remaining contractual term (Year)
Outstanding, aggregate intrinsic value | $ [1]
Exercisable, shares (in shares) | shares
Exercisable, weighted-average exercise price (in dollars per share) | $ / shares
Exercisable, weighted-average remaining contractual term (Year)
Exercisable, aggregate intrinsic value | $ [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 28, 2018, was $65.09.