Note 6 - Premises and Equipment (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2019
Depreciation, Total	$ 1,786,000	$ 1,282,000
Lessee, Operating Lease, Renewal Term	10 years
Accounting Standards Update 2016-02 [Member]
Operating Lease, Right-of-Use Asset			$ 2,374,000
Operating Lease, Liability, Total			$ 2,374,000