Note 8 - Commitments and Contingencies - Additional Lease Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Operating lease cost	$ 2,275	$ 1,912
Short-term lease cost	458	192
Total lease cost	2,733	2,104
Cash paid for amounts included in the measurement of operating lease liabilities	2,859	2,404
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 1,277	$ 2,770
Weighted average remaining lease term - operating leases (in years) (Year)	7 years 3 months 18 days	7 years 9 months 18 days
Weighted average discount rate - operating leases	4.86%	5.02%