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Note 2 - Investments - Schedule of Contractual Maturities (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Available-for-Sale, Amortized Cost | $ 316,735 | $ 310,272
Total securities available-for-sale, fair value | 291,133 | 281,175
Total securities held-to-maturity, amortized cost | 10,500 | 8,500
Total securities held-to-maturity, fair value | 10,258 | 8,144
Total securities, amortized cost | 327,235 | 318,772
Total securities, fair value | 301,391 | 289,319
US Government Agencies Debt Securities [Member] |  |
Due after one year through five years, amortized cost | 4,965 | 4,962
Due after one year through five years, fair value | 4,654 | 4,575
Due after five years through ten years, amortized cost | 10,976 | 10,975
Due after five years through ten years, fair value | 9,434 | 9,193
Due after ten years, amortized cost | 4,310 | 4,310
Due after ten years, fair value | 3,480 | 3,370
Subtotal, amortized cost | 20,251 | 20,247
Subtotal, fair value | 17,568 | 17,138
Available-for-Sale, Amortized Cost | 20,251 | 20,247
Total securities available-for-sale, fair value | 17,568 | 17,138
Corporate Debt Securities [Member] |  |
Due after one year through five years, amortized cost | 14,000 | 11,000
Due after one year through five years, fair value | 13,677 | 10,766
Due after five years through ten years, amortized cost | 0 | 3,000
Due after five years through ten years, fair value | 0 | 2,918
Due after ten years, amortized cost | 2,000 | 2,000
Due after ten years, fair value | 1,510 | 1,442
Subtotal, amortized cost | 16,000 | 16,000
Subtotal, fair value | 15,187 | 15,126
Available-for-Sale, Amortized Cost | 16,000 | 16,000
Total securities available-for-sale, fair value | 15,187 | 15,126
Due after five years through ten years, amortized cost, held to maturity | 10,500 | 8,500
Due after five years through ten years, fair value, held to maturity | 10,258 | 8,144
Municipal Bonds [Member] |  |
Due after one year through five years, amortized cost | 2,173 | 2,186
Due after one year through five years, fair value | 2,164 | 2,168
Due after five years through ten years, amortized cost | 4,145 | 4,158
Due after five years through ten years, fair value | 3,733 | 3,728
Due after ten years, amortized cost | 76,177 | 76,430
Due after ten years, fair value | 64,224 | 64,448
Subtotal, amortized cost | 82,495 | 82,774
Subtotal, fair value | 70,121 | 70,344
Available-for-Sale, Amortized Cost | 82,495 | 82,774
Total securities available-for-sale, fair value | 70,121 | 70,344
Collateralized Mortgage-Backed Securities [Member] |  |
Without single maturity date, amortized cost | 186,222 | 178,740
Without single maturity date, fair value | 177,382 | 167,186
Available-for-Sale, Amortized Cost | 186,222 | 178,740
Total securities available-for-sale, fair value | 177,382 | 167,186
Collateralized Mortgage-Backed Securities [Member] | Federal National Mortgage Association (FNMA) [Member] |  |
Without single maturity date, amortized cost | 90,055 | 90,771
Without single maturity date, fair value | 81,520 | 80,677
Collateralized Mortgage-Backed Securities [Member] | Federal Home Loan Mortgage Corporation (FHLMC) [Member] |  |
Without single maturity date, amortized cost | 49,219 | 48,765
Without single maturity date, fair value | 49,489 | 47,773
Collateralized Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA) [Member] |  |
Without single maturity date, amortized cost | 46,948 | 39,204
Without single maturity date, fair value | 46,373 | 38,736
Asset-Backed Securities [Member] |  |
Due after one year through five years, amortized cost | 843 | 1,073
Due after one year through five years, fair value | 817 | 1,037
Due after five years through ten years, amortized cost | 2,639 | 2,867
Due after five years through ten years, fair value | 2,458 | 2,648
Due after ten years, amortized cost | 7,954 | 8,368
Due after ten years, fair value | 7,274 | 7,496
Subtotal, amortized cost | 11,767 | 12,511
Subtotal, fair value | 10,875 | 11,381
Due within one year, amortized cost | 331 | 203
Due within one year, fair value | 326 | 200
Available-for-Sale, Amortized Cost | 11,767 | 12,511
Total securities available-for-sale, fair value | $ 10,875 | $ 11,381

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