Note H - Net Income Per Share - Computations of Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Net (loss)/income	$ (1,304)	$ 8,301
Basic (in shares)	5,746	5,921
Dilutive effect of common stock equivalents (in shares)		64
Diluted weighted average common shares outstanding (in shares)	5,746	5,985
Basic (in dollars per share)	$ (0.23)	$ 1.40
Diluted (in dollars per share)	$ (0.23)	$ 1.39