Note 5 - Premises, Equipment and Leases (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Depreciation, Depletion and Amortization, Total	$ 1,388,000	$ 1,172,000
Operating Lease, Weighted Average Remaining Lease Term	12 years 361 days
Operating Lease, Weighted Average Discount Rate, Percent	3.49%
Operating Lease, Cost	$ 194,000
Operating Leases, Rent Expense, Total		$ 208,000
Other Assets [Member]
Operating Lease, Right-of-Use Asset	1,500,000
Other Liabilities [Member]
Operating Lease, Liability, Total	$ 1,707,000