Note 17 - Quarterly Financial Summary (Unaudited) - Summary of Selected Financial Results of Operations by Quarter (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Revenues	$ 40,322	$ 54,614	$ 54,926	$ 48,634	$ 49,253	$ 46,138	$ 41,169	$ 41,660	$ 198,496	$ 178,220
Gross profit	2,674	3,738	5,417	6,172	3,989	3,994	3,892	3,537	18,001	15,412
Operating income (loss)	(1,818)	(475)	1,035	1,680	(1,399)	(258)	(206)	(494)	422	(2,357)
Income (loss) from continuing operations, net of tax	(1,967)	(1,003)	529	954	(1,627)	(898)	(1,018)	(1,043)	$ (1,487)	$ (4,586)
Net income (loss)	$ (1,967)	$ (1,003)	$ 529	$ 954	$ (1,565)	$ (898)	$ (1,018)	$ (1,042)
Basic (in dollars per share)	$ (0.12)	$ (0.06)	$ 0.03	$ 0.06	$ (0.09)	$ (0.06)	$ (0.06)	$ (0.07)	$ (0.09)	$ (0.28)
Diluted (in dollars per share)	(0.12)	(0.06)	0.03	0.06	(0.09)	(0.06)	(0.06)	(0.07)	(0.09)	(0.28)
Basic (in dollars per share)	(0.12)	(0.06)	0.03	0.06	(0.09)	(0.06)	(0.06)	(0.07)	(0.09)	(0.28)
Diluted (in dollars per share)	$ (0.12)	$ (0.06)	$ 0.03	$ 0.06	$ (0.09)	$ (0.06)	$ (0.06)	$ (0.07)	$ (0.09)	$ (0.28)