Note D - Net Loss Per Share - Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Net loss	$ (521)	$ (288)	$ (1,587)	$ (2,041)
Net loss per share:
Basic (in dollars per share)	$ (0.02)	$ (0.01)	$ (0.07)	$ (0.09)
Diluted (in dollars per share)	$ (0.02)	$ (0.01)	$ (0.07)	$ (0.09)
Weighted average number of shares of common stock outstanding during the period used to compute basic net loss per share (in thousands) (in shares)	22,757	22,681	22,650	22,680
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)
Weighted average number of shares of common stock used to compute diluted net loss per share (in thousands) (in shares)	22,757	22,681	22,650	22,680