Note 6 - Land, Premises, and Equipment, Net (Details Textual) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Jun. 30, 2024
Depreciation	$ 0.7	$ 0.6	$ 2.1	$ 1.9
Other Assets [Member]
Disposal Group, Including Discontinued Operation, Assets	2.1		2.1
Disposal Group, Held-for-Sale, Not Discontinued Operations [Member] | Purchase Agreement to Sell Branch in South Fargo [Member]
Disposal Group, Including Discontinued Operation, Assets					$ 1.7
Disposal Group, Including Discontinued Operation, Consideration	5.1		5.1
Disposal Group, Held-for-Sale, Not Discontinued Operations [Member] | Purchase Agreement to Sell Branch in West Fargo, North Dakota [Member]
Disposal Group, Including Discontinued Operation, Assets	0.4		0.4
Disposal Group, Including Discontinued Operation, Consideration	$ 3.8		$ 3.8