Note 5 - Leases (Details Textual)	12 Months Ended
	Dec. 31, 2019 USD ($)
Operating Lease, Weighted Average Remaining Lease Term	22 years
Operating Lease, Weighted Average Discount Rate, Percent	5.46%
Operating Leases, Rent Expense, Net, Total	$ 294,000
Other Liabilities [Member]
Operating Lease, Liability, Total	3,070,000
Premises and Equipment [Member]
Operating Lease, Right-of-Use Asset	$ 3,100,000