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Note 4 - Loans Receivable and Allowance for Credit Losses on Loans - Schedule of Amortized Cost of Nonaccrual Loans (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Financing Receivable, Nonaccrual, No Allowance |  | $ 1,357 | $ 966
Financing Receivable, Nonaccrual, With Allowance |  | 9,595 | 7,686
Financing Receivable, Nonaccrual | [1] | 10,952 | 8,652
Real Estate Portfolio Segment [Member] |  |  |
Financing Receivable, Nonaccrual, No Allowance |  | 1,357 | 966
Financing Receivable, Nonaccrual, With Allowance |  | 4,699 | 0
Financing Receivable, Nonaccrual | [1] | 6,056 | 966
Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] |  |  |
Financing Receivable, Nonaccrual, No Allowance |  | 1,088 | 0
Financing Receivable, Nonaccrual, With Allowance |  | 0 | 0
Financing Receivable, Nonaccrual | [1] | 1,088 | 0
Real Estate Portfolio Segment [Member] | Construction Loans [Member] |  |  |
Financing Receivable, Nonaccrual, No Allowance |  | 0 | 0
Financing Receivable, Nonaccrual, With Allowance |  | 4,699 | 0
Financing Receivable, Nonaccrual | [1] | 4,699 | 0
Real Estate Portfolio Segment [Member] | Home Equity Loan [Member] |  |  |
Financing Receivable, Nonaccrual, No Allowance |  | 173 | 46
Financing Receivable, Nonaccrual, With Allowance |  | 0 | 0
Financing Receivable, Nonaccrual | [1] | 173 | 46
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member] |  |  |
Financing Receivable, Nonaccrual, No Allowance |  | 96 | 920
Financing Receivable, Nonaccrual, With Allowance |  | 0 | 0
Financing Receivable, Nonaccrual | [1] | 96 | 920
Consumer Portfolio Segment [Member] |  |  |
Financing Receivable, Nonaccrual, No Allowance |  |  | 0
Financing Receivable, Nonaccrual, With Allowance |  | 2,213 | 1,352
Financing Receivable, Nonaccrual | [1] | 2,213 | 1,352
Consumer Portfolio Segment [Member] | Indirect Home Improvement Loan [Member] |  |  |
Financing Receivable, Nonaccrual, No Allowance |  | 0 | 0
Financing Receivable, Nonaccrual, With Allowance |  | 1,863 | 1,076
Financing Receivable, Nonaccrual | [1] | 1,863 | 1,076
Consumer Portfolio Segment [Member] | Marine Loans [Member] |  |  |
Financing Receivable, Nonaccrual, No Allowance |  | 0 | 0
Financing Receivable, Nonaccrual, With Allowance |  | 342 | 267
Financing Receivable, Nonaccrual | [1] | 342 | 267
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member] |  |  |
Financing Receivable, Nonaccrual, No Allowance |  | 0 | 0
Financing Receivable, Nonaccrual, With Allowance |  | 8 | 9
Financing Receivable, Nonaccrual | [1] | 8 | 9
Commercial Business Portfolio Segment [Member] |  |  |
Financing Receivable, Nonaccrual | [1] | 2,683 | 6,334
Commercial Business Portfolio Segment [Member] | Commercial Loan [Member] |  |  |
Financing Receivable, Nonaccrual, No Allowance |  | 0 | 0
Financing Receivable, Nonaccrual, With Allowance |  | 2,683 | 6,334
Financing Receivable, Nonaccrual | [1] | $ 2,683 | $ 6,334
[1] | Includes past due loans as applicable.

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