Note 11 - Leases - Summary of Other Information Related to Operating Leases (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 222	$ 225
Weighted-average remaining lease term – operating leases (Year)	4 years 182 days	5 years 146 days
Weighted-average discount rate – operating leases	2.19%	2.60%