Note D - Net Loss Per Share - Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net income (loss)	$ 484	$ 405	$ (1,103)	$ (1,637)
Net earnings (loss) per share:
Basic (in dollars per share)	$ 0.02	$ 0.02	$ (0.05)	$ (0.07)
Diluted (in dollars per share)	$ 0.02	$ 0.02	$ (0.05)	$ (0.07)
Weighted average number of shares of common stock outstanding during the period used to compute basic net earnings (loss) per share (in thousands) (in shares)	22,957	22,449	22,752	22,603
Incremental shares attributable to exercise of outstanding options, stock appreciation rights and restricted stock units (assuming proceeds would be used to purchase treasury stock) (in thousands) (in shares)	983	889
Weighted average number of shares of common stock used to compute diluted net earnings (loss) per share (in thousands) (in shares)	23,940	23,338	22,752	22,603