Note 5 - Premises, Equipment and Leases (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Depreciation, Depletion and Amortization, Total	$ 1,361,000	$ 1,406,000
Operating Lease, Weighted Average Remaining Lease Term (Year)	10 years 11 months 26 days	12 years 5 months 12 days
Operating Lease, Weighted Average Discount Rate, Percent	3.21%	3.51%
Operating Lease, Cost	$ 231,000	$ 192,000
Other Assets [Member]
Operating Lease, Right-of-Use Asset	1,500,000	1,400,000
Other Liabilities [Member]
Operating Lease, Liability, Total	$ 1,663,000	$ 1,600,000