Note 6 - Premises and Equipment - Lease Cost (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Weighted average remaining lease term (Year)	6 years 328 days
Weighted average discount rate	3.24%
Operating lease cost	$ 544
Short-term lease cost	97
Total lease cost	641
Premises and Equipment, Net [Member]
Right of use assets, net of amortization	1,900
Accrued Expenses and Other Liabilities [Member]
Lease liabilities	$ 1,900