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Note 4 - Mortgage Servicing Rights - Fair Value of Servicing Rights (Details) - Mortgage Servicing Rights [Member] | Mar. 31, 2026 | Dec. 31, 2025
--- | --- | ---
Measurement Input, Discount Rate [Member] |  |
Valuation assumptions | 0.12 | 0.12
Measurement Input, Prepayment Rate [Member] | Minimum [Member] |  |
Valuation assumptions | 0.94 | 0.90
Measurement Input, Prepayment Rate [Member] | Maximum [Member] |  |
Valuation assumptions | 2.79 | 2.11
Measurement Input, Weighted Average Prepayment Rate [Member] |  |
Valuation assumptions | 1.27 | 1.19

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