Note 3 - Earnings Per Share - Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended						9 Months Ended
		Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Net (loss) income		$ (1,003)	$ 529	$ 954	$ (898)	$ (1,018)	$ (1,042)	$ 480	$ (2,958)
Weighted average number of common shares outstanding (in shares)		16,866,134			16,235,961			16,741,481	16,024,217
Basic net (loss) income per share (in dollars per share)		$ (0.06)			$ (0.06)			$ 0.03	$ (0.18)
Non-vested stock awards (in shares)	[1]							536,920
Weighted average number of common shares outstanding (in shares)		16,866,134			16,235,961			17,278,401	16,024,217
Diluted net (loss) income per share (in dollars per share)		$ (0.06)			$ (0.06)			$ 0.03	$ (0.18)

[1] Stock options and restricted stock units granted and outstanding of 1,489,660 as of September 30, 2019 are excluded from the computation of diluted earnings due to the anti-dilutive effect as a result of the Company's net loss for three and nine months ended September 30, 2019.