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Note H - Income Per Share - Computations of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Net Income	$ 4,581	$ 8,654	$ 8,301	$ 9,248	$ 7,289	$ 1,387	$ 21,536	$ 17,924
Basic (in shares)	5,756			6,034			5,859	6,120
Dilutive effect of common stock equivalents (in shares)	43			54			48	83
Diluted weighted average common shares outstanding (in shares)	5,799			6,088			5,907	6,203
Basic (in dollars per share)	$ 0.80			$ 1.53			$ 3.68	$ 2.93
Diluted (in dollars per share)	$ 0.79			$ 1.52			$ 3.65	$ 2.89

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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