Note 9 - NET LOSS PER SHARE - Calculation of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
NET LOSS PER SHARE
Net loss	$ (4,150)	$ (7,597)
Basic weighted-average shares outstanding (in shares)	37,606	36,974
Diluted weighted-average shares outstanding (in shares)	37,606	36,974
Basic (in dollars per share)	$ (0.11)	$ (0.21)
Diluted (in dollars per share)	$ (0.11)	$ (0.21)