Note 11 - Leases (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Operating Lease, Weighted Average Remaining Lease Term (Year)	12 years 208 days	13 years 51 days	12 years 208 days	13 years 51 days
Operating Lease, Weighted Average Discount Rate, Percent	3.50%	3.48%	3.50%	3.48%
Operating Lease, Cost	$ 48,000	$ 48,000	$ 144,000	$ 145,000
Premises and Equipment [Member]
Operating Lease, Right-of-Use Asset	1,400,000	1,500,000	1,400,000	1,500,000
Other Liabilities [Member]
Operating Lease, Liability, Total	$ 1,591,000	$ 1,700,000	$ 1,591,000	$ 1,700,000