Note 9 - Net Loss Per Share - Calculation of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Net loss	$ (3,652)	$ (710)	$ (4,180)	$ (3,401)
Basic weighted-average shares outstanding (in shares)	32,886	32,339	32,795	32,412
Effect of dilutive options and restricted stock units (in shares)	0	0	0	0
Diluted weighted average shares outstanding (in shares)	32,886	32,339	32,795	32,412
Basic (in dollars per share)	$ (0.11)	$ (0.02)	$ (0.13)	$ (0.10)
Diluted (in dollars per share)	$ (0.11)	$ (0.02)	$ (0.13)	$ (0.10)