Note 10 - Accrued Expenses - Summary of Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Compensation and related expenses	$ 7,345	$ 5,830
Professional fees	3,438	3,850
Clinical trial costs	1,429	788
Finance lease liability - current	148	0
Other	996	836
Total	14,793	12,445
Accrued Expenses and Other Current Liabilities [Member]
Operating lease liability - current	1,437	$ 1,141
Finance lease liability - current	$ 148