Note 7 - Leases - Additional Lease Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Operating lease cost	$ 588	$ 457	$ 1,682	$ 1,413
Short-term lease cost	123	67	313	123
Total lease cost	711	524	1,995	1,536
Cash paid for amounts included in the measurement of operating lease liabilities	725	590	2,106	1,761
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 0	$ 96	$ 1,277	$ 2,577
Weighted average remaining lease term - operating leases (in years) (Year)	8 years 4 months 24 days	8 years 2 months 12 days	8 years 4 months 24 days	8 years 2 months 12 days
Weighted average discount rate - operating leases	4.86%	5.17%	4.86%	5.17%