Note 3 - Loss Per Share - Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Net loss	$ (5,760)	$ (5,101)
Weighted-average shares outstanding (in shares)	19,752,248	18,914,059
Weighted-average shares outstanding with dilution (in shares)	19,752,248	18,914,059
Basic (in dollars per share)	$ (0.29)	$ (0.27)
Diluted (in dollars per share)	$ (0.29)	$ (0.27)
Employee Stock Option [Member]
Dilutive effect of share-based awards (in shares)
Restricted Stock [Member]
Dilutive effect of share-based awards (in shares)