Note 5 - Leases - Leases Cost (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Operating lease costs	$ 578	$ 363	$ 1,071	$ 729
Other	120	71	247	148
Total lease costs	698	434	1,318	877
Operating cash flows from operating leases	698	330	1,010	703
ROU assets obtained in exchange for new operating lease liabilities	$ 744	$ 1,467	$ 3,684	$ 1,744
Weighted-average remaining lease term (in years) (Year)	3 years 3 months 18 days		3 years 3 months 18 days		2 years 8 months 12 days
Weighted-average discount rate	2.20%		2.20%		2.70%