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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 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Financing Receivable, Nonaccrual, No Allowance |  | $ 1,737 | $ 1,357
Financing Receivable, Nonaccrual, With Allowance |  | 10,369 | 9,595
Financing Receivable, Nonaccrual | [1] | 12,106 | 10,952
Real Estate Portfolio Segment [Member] |  |  |
Financing Receivable, Nonaccrual, No Allowance |  | 1,445 | 1,357
Financing Receivable, Nonaccrual, With Allowance |  | 4,737 | 4,699
Financing Receivable, Nonaccrual | [1] | 6,182 | 6,056
Real Estate Portfolio Segment [Member] | Commercial Real Estate [Member] |  |  |
Financing Receivable, Nonaccrual, No Allowance |  | 1,102 | 1,088
Financing Receivable, Nonaccrual, With Allowance |  | 0 | 0
Financing Receivable, Nonaccrual |  | 1,102 | 1,088
Real Estate Portfolio Segment [Member] | Construction Loans [Member] |  |  |
Financing Receivable, Nonaccrual, No Allowance |  | 0 | 0
Financing Receivable, Nonaccrual, With Allowance |  | 4,737 | 4,699
Financing Receivable, Nonaccrual | [1] | 4,737 | 4,699
Real Estate Portfolio Segment [Member] | Home Equity Loan [Member] |  |  |
Financing Receivable, Nonaccrual, No Allowance |  | 170 | 173
Financing Receivable, Nonaccrual, With Allowance |  | 0 | 0
Financing Receivable, Nonaccrual | [1] | 170 | 173
Real Estate Portfolio Segment [Member] | One-to-four Family Loan [Member] |  |  |
Financing Receivable, Nonaccrual, No Allowance |  | 173 | 96
Financing Receivable, Nonaccrual, With Allowance |  | 0 | 0
Financing Receivable, Nonaccrual | [1] | 173 | 96
Consumer Portfolio Segment [Member] |  |  |
Financing Receivable, Nonaccrual, No Allowance |  |  | 0
Financing Receivable, Nonaccrual, With Allowance |  | 2,583 | 2,213
Financing Receivable, Nonaccrual | [1] | 2,583 | 2,213
Consumer Portfolio Segment [Member] | Indirect Home Improvement Loan [Member] |  |  |
Financing Receivable, Nonaccrual, No Allowance |  | 0 | 0
Financing Receivable, Nonaccrual, With Allowance |  | 2,195 | 1,863
Financing Receivable, Nonaccrual | [1] | 2,195 | 1,863
Consumer Portfolio Segment [Member] | Marine Loans [Member] |  |  |
Financing Receivable, Nonaccrual, No Allowance |  | 0 | 0
Financing Receivable, Nonaccrual, With Allowance |  | 385 | 342
Financing Receivable, Nonaccrual | [1] | 385 | 342
Consumer Portfolio Segment [Member] | Other Consumer Loan [Member] |  |  |
Financing Receivable, Nonaccrual, No Allowance |  | 0 | 0
Financing Receivable, Nonaccrual, With Allowance |  | 3 | 8
Financing Receivable, Nonaccrual | [1] | 3 | 8
Commercial Business Portfolio Segment [Member] |  |  |
Financing Receivable, Nonaccrual | [1] | 3,341 | 2,683
Commercial Business Portfolio Segment [Member] | Commercial Loan [Member] |  |  |
Financing Receivable, Nonaccrual, No Allowance |  | 292 | 0
Financing Receivable, Nonaccrual, With Allowance |  | 3,049 | 2,683
Financing Receivable, Nonaccrual | [1] | $ 3,341 | $ 2,683
[1] | Includes past due loans as applicable.

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