Note 7 - Net Earnings Per Share - Computation of Basic and Diluted Net Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Net income (loss)	$ (7)	$ 1,486
Weighted average outstanding shares of common stock (b) (in shares)	1,925	2,030
Dilutive potential common shares from employee stock options (in shares)		27
Common stock and common stock equivalents (c) (in shares)	1,925	2,057
Basic net income per share (a)/(b) (in dollars per share)	$ 0	$ 0.73
Diluted net income per share (a)/(c) (in dollars per share)	$ 0	$ 0.72