Note 11 - Leases - Summary of Other Information Related to Operating Leases (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 224	$ 221	$ 669	$ 667
Weighted-average remaining lease term – operating leases (Year)	3 years 328 days	5 years	3 years 328 days	5 years
Weighted-average discount rate – operating leases	2.19%	2.19%	2.19%	2.19%