Note 3 - Loss Per Share - Net Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Net loss	$ (2,577)	$ (3,074)	$ (5,433)	$ (2,755)
Weighted–average shares outstanding (in shares)	20,152,029	19,669,353	20,152,029	19,607,204
Weighted–average shares outstanding with dilution (in shares)	20,152,029	19,669,353	20,152,029	19,607,204
Basic (in dollars per share)	$ (0.13)	$ (0.16)	$ (0.27)	$ (0.14)
Diluted (in dollars per share)	$ (0.13)	$ (0.16)	$ (0.27)	$ (0.14)
Share-based Payment Arrangement, Option [Member]
Dilutive effect of share-based awards (in shares)
Restricted Stock [Member]
Dilutive effect of share-based awards (in shares)