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Note D - Stock Based Compensation (Details) - Employee Stock Option Activity (USD $)	9 Months Ended
	Sep. 30, 2014
Employee Stock Option Activity [Abstract]
Outstanding-beginning of year	164,098
Outstanding-beginning of year	$ 10.99
Exercised	(77,308)
Exercised	$ 10.88
Cancelled/forfeited/expired	(42)
Cancelled/forfeited/expired	$ 11.22
Outstanding at September 30, 2014	86,748
Outstanding at September 30, 2014	$ 11.09
Outstanding at September 30, 2014	5 years 6 months
Outstanding at September 30, 2014	$ 2,182,370	[1]
Exercisable at September 30, 2014	33,139
Exercisable at September 30, 2014	$ 11.29
Exercisable at September 30, 2014	2 years 219 days
Exercisable at September 30, 2014	$ 827,289	[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, 2014, was $36.25.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Number of share options (or share units) exercised during the current period.

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