Note 7 - Leases - Additional Lease Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Operating lease cost	$ 487	$ 481	$ 1,094	$ 955
Short-term lease cost	126	44	190	57
Total lease cost	613	525	1,284	1,012
Cash paid for amounts included in the measurement of operating lease liabilities	633	580	1,381	1,171
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 1,261	$ 2,332	$ 1,277	$ 2,481
Weighted average remaining lease term - operating leases (in years) (Year)	8 years 2 months 12 days	8 years 9 months 18 days	8 years 2 months 12 days	8 years 9 months 18 days
Weighted average discount rate - operating leases	4.86%	5.25%	4.86%	5.25%