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Note 3 - Investments - Schedule of Contractual Maturities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Total securities available-for-sale, amortized cost | $ 328,695 | $ 271,793
Fair value, available for sale securities | 292,933 | 229,252
Total securities held-to-maturity, amortized cost | 8,500 | 8,500
Total securities held-to-maturity, fair value | 7,666 | 7,929
Total securities | 337,195 | 280,293
Total securities, fair value | 300,599 | 237,181
US Government Agencies Debt Securities [Member] |  |
Due within one year, amortized cost | 922 | 0
Due within one year, fair value | 914 | 0
Due after one year through five years, amortized cost | 3,947 | 4,874
Due after one year through five years, fair value | 3,544 | 4,321
Due after five years through ten years, amortized cost | 11,972 | 6,989
Due after five years through ten years, fair value | 10,139 | 5,963
Due after ten years, amortized cost | 4,310 | 9,290
Due after ten years, fair value | 3,421 | 7,004
Subtotal, amortized cost | 21,151 | 21,153
Subtotal, fair value | 18,018 | 17,288
Total securities available-for-sale, amortized cost | 21,151 | 21,153
Fair value, available for sale securities | 18,018 | 17,288
Corporate Debt Securities [Member] |  |
Due within one year, amortized cost | 1,000 | 1,000
Due within one year, fair value | 1,004 | 997
Due after one year through five years, amortized cost | 6,000 | 2,497
Due after one year through five years, fair value | 6,609 | 2,519
Due after five years through ten years, amortized cost | 4,000 | 4,000
Due after five years through ten years, fair value | 3,839 | 3,763
Due after ten years, amortized cost | 2,000 | 2,000
Due after ten years, fair value | 1,420 | 1,266
Subtotal, amortized cost | 13,000 | 9,497
Subtotal, fair value | 12,872 | 8,545
Total securities available-for-sale, amortized cost | 13,000 | 9,497
Fair value, available for sale securities | 12,872 | 8,545
Due after five years through ten years, amortized cost, held to maturity | 8,500 | 8,500
Due after five years through ten years, fair value, held to maturity | 7,666 | 7,929
Municipal Bonds [Member] |  |
Due within one year, amortized cost | 1,013 | 2,660
Due within one year, fair value | 1,003 | 2,644
Due after one year through five years, amortized cost | 757 | 1,038
Due after one year through five years, fair value | 751 | 1,012
Due after five years through ten years, amortized cost | 7,603 | 6,341
Due after five years through ten years, fair value | 7,101 | 5,771
Due after ten years, amortized cost | 129,430 | 134,161
Due after ten years, fair value | 110,592 | 111,175
Subtotal, amortized cost | 138,803 | 144,200
Subtotal, fair value | 119,447 | 120,602
Total securities available-for-sale, amortized cost | 138,803 | 144,200
Fair value, available for sale securities | 119,447 | 120,602
Collateralized Mortgage-Backed Securities [Member] |  |
Without single maturity date, amortized cost | 112,855 | 82,424
Without single maturity date, fair value | 101,248 | 69,966
Total securities available-for-sale, amortized cost | 112,855 | 82,424
Fair value, available for sale securities | 101,248 | 69,966
Collateralized Mortgage-Backed Securities [Member] | Federal National Mortgage Association (FNMA) [Member] |  |
Without single maturity date, amortized cost | 76,369 | 68,421
Without single maturity date, fair value | 66,275 | 57,358
Collateralized Mortgage-Backed Securities [Member] | Federal Home Loan Mortgage Corporation (FHLMC) [Member] |  |
Without single maturity date, amortized cost | 32,311 | 9,290
Without single maturity date, fair value | 31,376 | 8,424
Collateralized Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA) [Member] |  |
Without single maturity date, amortized cost | 4,175 | 4,713
Without single maturity date, fair value | 3,597 | 4,184
U.S. Small Business Administration Securities [Member] |  |
Due within one year, amortized cost | 198 | 0
Due within one year, fair value | 196 | 0
Due after one year through five years, amortized cost | 1,860 | 2,553
Due after one year through five years, fair value | 1,824 | 2,407
Due after five years through ten years, amortized cost | 21,420 | 4,461
Due after five years through ten years, fair value | 20,929 | 3,996
Due after ten years, amortized cost | 19,408 | 7,505
Due after ten years, fair value | 18,399 | 6,448
Subtotal, amortized cost | 42,886 | 14,519
Subtotal, fair value | 41,348 | 12,851
Total securities available-for-sale, amortized cost | 42,886 | 14,519
Fair value, available for sale securities | $ 41,348 | $ 12,851

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