Note 10 - Leases - Lease Information and Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Right-of-use asset	$ 2,074		$ 2,074		$ 2,277
Weighted average remaining lease term (in years) (Year)					6 years 10 months 24 days
Weighted average discount rate	3.04%		3.04%		3.02%
Operating lease expense	$ 92	$ 82	$ 277	$ 218
Short-term lease expense	1	29	2	101
Total lease expense	93	111	279	319
Cash paid for amounts included in lease liabilities	90	79	272	211
Right-of-use assets obtained in exchange for operating lease liabilities commencing during the period	23	$ 284	23	$ 1,837
Other Liabilities [Member]
Lease liability	$ 2,090		$ 2,090		$ 2,286