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Note 3 - Investments in Securities - Schedule of Held-to-Maturity Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2026 | Dec. 31, 2025
--- | --- | ---
Amortized Cost, Held-to-maturity | $ 51,624 | $ 55,764
Gross Unrealized Gains, Held-to-maturity | 237 | 350
Gross Unrealized Losses, Held-to-maturity | (3,817) | (3,788)
Allowance for Credit Losses, Held-to-Maturity | 0 | 0
Investments in held-to-maturity securities, fair value | 48,044 | 52,326
Collateralized Mortgage-Backed Securities [Member] |  |
Amortized Cost, Held-to-maturity | 35,492 | 36,645
Gross Unrealized Gains, Held-to-maturity | 37 | 88
Gross Unrealized Losses, Held-to-maturity | (3,465) | (3,453)
Allowance for Credit Losses, Held-to-Maturity | 0 | 0
Investments in held-to-maturity securities, fair value | 32,064 | 33,280
Corporate Debt Securities [Member] |  |
Amortized Cost, Held-to-maturity | 16,132 | 19,119
Gross Unrealized Gains, Held-to-maturity | 200 | 262
Gross Unrealized Losses, Held-to-maturity | (352) | (335)
Allowance for Credit Losses, Held-to-Maturity | 0 | 0
Investments in held-to-maturity securities, fair value | $ 15,980 | $ 19,046

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