Note 5 - Net Earnings Per Share - Computation of Basic and Diluted Net Earnings 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	$ 49	$ 405	$ 179	$ 1,469
Weighted average outstanding shares of common stock (in shares)	1,922	2,048	1,967	2,048
Dilutive potential common shares from employee stock options (in shares)		17		40
Diluted (in shares)	1,922	2,065	1,967	2,088
Basic net income per share (in dollars per share)	$ 0.03	$ 0.20	$ 0.09	$ 0.72
Diluted net income per share (in dollars per share)	$ 0.03	$ 0.20	$ 0.09	$ 0.70