Note 7 - Leases - Additional Lease Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Operating lease cost	$ 607	$ 474
Short-term lease cost	64	13
Total lease cost	671	487
Cash paid for amounts included in the measurement of operating lease liabilities	748	591
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 16	$ 149
Weighted average remaining lease term in years - operating leases (Year)	8 years	8 years 7 months 6 days
Weighted average discount rate - operating leases	5.02%	5.25%