Note 15 - Unaudited Condensed Consolidated Balance Sheet Detail - Accrued Liabilities and Other Current Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Accrued expenses	$ 1,435	$ 472
Accrued taxes	62	112
Accrued compensation	4,167	2,898
Warranty reserve liability	5,552	212
Deferred revenue, current	710	931
Other	131	130
Total accrued expenses and other current liabilities	$ 12,057	$ 4,755