Note 5 - Loans Receivable, Net - Commercial Real Estate Loans (Details) - USD ($) $ in Thousands		Dec. 31, 2023	Dec. 31, 2022
Loans receivable		$ 858,108	$ 787,887
Commercial Real Estate Portfolio Segment [Member]
Loans receivable		$ 489,953	$ 471,345
Percent of Total		100.00%	100.00%
Commercial Real Estate Portfolio Segment [Member] | COLORADO
Loans receivable		$ 5,865	$ 6,031
Percent of Total		1.20%	1.30%
Commercial Real Estate Portfolio Segment [Member] | FLORIDA
Loans receivable		$ 6,797	$ 7,049
Percent of Total		1.40%	1.50%
Commercial Real Estate Portfolio Segment [Member] | IDAHO
Loans receivable		$ 4,718	$ 4,712
Percent of Total		1.00%	1.00%
Commercial Real Estate Portfolio Segment [Member] | IOWA
Loans receivable		$ 10,011	$ 10,440
Percent of Total		2.00%	2.20%
Commercial Real Estate Portfolio Segment [Member] | MINNESOTA
Loans receivable		$ 285,886	$ 284,841
Percent of Total		58.30%	60.40%
Commercial Real Estate Portfolio Segment [Member] | NORTH CAROLINA
Loans receivable		$ 3,973	$ 4,211
Percent of Total		0.80%	0.90%
Commercial Real Estate Portfolio Segment [Member] | WISCONSIN
Loans receivable		$ 162,456	$ 143,076
Percent of Total		33.20%	30.40%
Commercial Real Estate Portfolio Segment [Member] | Other States [Member]
Loans receivable	[1]	$ 10,247	$ 10,985
Percent of Total		2.10%	2.30%

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