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Note 4 - Loans, Allowance for Credit Losses and Credit Quality - Schedule of Nonaccrual Loans (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2026 | Mar. 31, 2025 | Dec. 31, 2025
Total nonaccrual loans, with allowance for credit loss | $ 0 |  | $ 0
Total nonaccrual loans, without allowance for credit loss | 1,230,000 |  | 1,139,000
Total loans, nonaccrual | 1,230,000 |  | 1,139,000
Interest Income recognized | 16,000 | $ 39,000 | 99,000
Real Estate Portfolio Segment [Member] | One-to-four Family Residential Loan [Member] |  |  |
Total nonaccrual loans, with allowance for credit loss | 0 |  | 0
Total nonaccrual loans, without allowance for credit loss | 1,090,000 |  | 1,096,000
Total loans, nonaccrual | 1,090,000 |  | 1,096,000
Interest Income recognized | 15,000 |  | 74,000
Real Estate Portfolio Segment [Member] | Home Equity Loan [Member] |  |  |
Total nonaccrual loans, with allowance for credit loss | 0 |  | 0
Total nonaccrual loans, without allowance for credit loss | 140,000 |  | 43,000
Total loans, nonaccrual | 140,000 |  | 43,000
Interest Income recognized | $ 1,000 |  | $ 25,000

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