Note 10 - Net Loss Per Share - Calculation of 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 loss	$ (687)	$ (2,082)	$ (4,088)	$ (4,602)
Basic weighted-average common shares outstanding (in shares)	32,392	32,184	32,405	32,105
Effect of dilutive options and restricted stock (in shares)
Diluted weighted average shares outstanding (in shares)	32,392	32,184	32,405	32,105
Basic (in dollars per share)	$ (0.02)	$ (0.06)	$ (0.13)	$ (0.14)
Diluted (in dollars per share)	$ (0.02)	$ (0.06)	$ (0.13)	$ (0.14)