Note D - Net Loss Per Share - Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Net loss	$ (31)	$ (1,891)	$ (1,773)	$ (5,434)
Basic and Diluted (in dollars per share)	$ (0.00)	$ (0.08)	$ (0.07)	$ (0.23)
Weighted average number of shares of common stock outstanding during the period used to compute basic net loss per share (in thousands) (in shares)	24,141	23,562	24,134	23,399
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)	0	0	0	0
Weighted average number of shares of common stock used to compute diluted net loss per share (in thousands) (in shares)	24,141	23,562	24,134	23,399