Note 7 - Leases - Additional Lease Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Operating lease cost	$ 481	$ 432	$ 955	$ 854
Short-term lease cost	44	63	57	131
Total lease cost	525	495	1,012	985
Cash paid for amounts included in the measurement of operating lease liabilities	580	445	1,171	959
Right-of-use assets obtained in exchange for new operating leae liabilities	$ 2,332	$ 594	$ 2,481	$ 810
Weighted average remaining lease term - operating leases (in years) (Year)	8 years 9 months 18 days	4 years 1 month 6 days	8 years 9 months 18 days	4 years 1 month 6 days
Weighted average discount rate - operating leases	5.25%	5.25%	5.25%	5.25%