Note 5 - Loans Receivable, Net - Loans Originated by State (Details) - USD ($) $ in Thousands		Dec. 31, 2022	Dec. 31, 2021
Loans receivable		$ 787,887	$ 662,000
Residential Portfolio Segment [Member]
Loans receivable		$ 205,890	$ 163,322
Percent of Total		100.00%	100.00%
Residential Portfolio Segment [Member] | Minnesota [Member]
Loans receivable		$ 177,139	$ 142,252
Percent of Total		86.00%	87.10%
Residential Portfolio Segment [Member] | WISCONSIN
Loans receivable		$ 23,030	$ 15,048
Percent of Total		11.20%	9.20%
Residential Portfolio Segment [Member] | Other States [Member]
Loans receivable	[1]	$ 5,721	$ 6,022
Percent of Total		2.80%	3.70%

[1] Amounts under four million dollars in both years are included in “Other states”.