Note 1 - Summary of Significant Accounting Policies (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Debt Securities, Trading, and Equity Securities, FV-NI	$ 0
Federal Home Loan Bank, Minimum Investment Requirement	13,100,000	$ 14,400,000
Other Than Temporary Impairment Loss on FHLB Stock	0
Transfers of financial Assets, Mortgage Loans Sold with Recourse, Remaining Balance	1,200,000	1,500,000
Transfers of financial Assets, Mortgage Loans Sold with Recourse, Amount Repurchased	0
Non-publicly Traded Stock and Simple Agreements for Future Equity ("SAFE") [Member]
Equity Securities without Readily Determinable Fair Value, Amount	1,800,000	500,000
Partnership Interest [Member]
Equity Method Investments	13,700,000	$ 12,700,000
Residential Portfolio Segment [Member] | One-to-four Family Loan [Member]
Other Real Estate, Foreclosed Assets, and Repossessed Assets	$ 1,400,000