Note 4 - Leases (Details Textual) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Operating Lease, Weighted Average Remaining Lease Term (Year)	22 years
Operating Lease, Weighted Average Discount Rate, Percent	5.47%
Operating Leases, Rent Expense, Net, Total	$ 120,000	$ 65,000
Other Liabilities [Member]
Operating Lease, Liability, Total	2,883,000	445,000
Premises and Equipment [Member]
Operating Lease, Right-of-Use Asset	$ 2,900,000	$ 445,000