Note 11 - Leases (Details Textual) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating Lease, Weighted Average Remaining Lease Term	13 years 164 days
Operating Lease, Weighted Average Discount Rate, Percent	3.47%
Operating Lease, Cost	$ 49,000
Operating Lease, Liability, Total	1,820,000
Operating Leases, Rent Expense, Total		$ 50,000
Premises and Equipment [Member]
Operating Lease, Right-of-Use Asset	1,600,000
Other Liabilities [Member]
Operating Lease, Liability, Total	$ 1,800,000