Note 12 - Net Income Per-share - Reconciliation of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Net income	$ 2,437	$ 766
Weighted-average shares of common stock outstanding (in shares)	15,532	15,507
Basic net income per share (in dollars per share)	$ 0.16	$ 0.05
	$ 2,437	$ 766
Dilutive options and warrants outstanding (in shares)	3,147	1,013
Effect of conversion of convertible notes (in shares)		4
Number of shares used in diluted per-share computation (in shares)	18,679	16,524
Diluted net income per share (in dollars per share)	$ 0.13	$ 0.05