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Note 2 - Investments - Schedule of Contractual Maturities (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Available-for-Sale, Amortized Cost | $ 250,648 | $ 328,695
Fair value, available for sale securities | 221,182 | 292,933
Total securities held-to-maturity, amortized cost | 8,500 | 8,500
Total securities held-to-maturity, fair value | 7,867 | 7,666
Total securities | 259,148 | 337,195
Total securities, fair value | 229,049 | 300,599
US Government Agencies Debt Securities [Member] |  |
Due within one year, amortized cost | 0 | 922
Due within one year, fair value | 0 | 914
Due after one year through five years, amortized cost | 4,954 | 3,947
Due after one year through five years, fair value | 4,499 | 3,544
Due after five years through ten years, amortized cost | 10,973 | 11,972
Due after five years through ten years, fair value | 9,207 | 10,139
Due after ten years, amortized cost | 4,311 | 4,310
Due after ten years, fair value | 3,410 | 3,421
Subtotal, amortized cost | 20,238 | 21,151
Subtotal, fair value | 17,116 | 18,018
Available-for-Sale, Amortized Cost | 20,238 | 21,151
Fair value, available for sale securities | 17,116 | 18,018
Corporate Debt Securities [Member] |  |
Due within one year, amortized cost | 0 | 1,000
Due within one year, fair value | 0 | 1,004
Due after one year through five years, amortized cost | 10,000 | 6,000
Due after one year through five years, fair value | 9,960 | 6,609
Due after five years through ten years, amortized cost | 4,000 | 4,000
Due after five years through ten years, fair value | 3,839 | 3,839
Due after ten years, amortized cost | 2,000 | 2,000
Due after ten years, fair value | 1,386 | 1,420
Subtotal, amortized cost | 16,000 | 13,000
Subtotal, fair value | 15,185 | 12,872
Available-for-Sale, Amortized Cost | 16,000 | 13,000
Fair value, available for sale securities | 15,185 | 12,872
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 | 7,867 | 7,666
Municipal Bonds [Member] |  |
Due within one year, amortized cost | 1,000 | 1,013
Due within one year, fair value | 1,000 | 1,003
Due after one year through five years, amortized cost | 78 | 757
Due after one year through five years, fair value | 78 | 751
Due after five years through ten years, amortized cost | 6,316 | 7,603
Due after five years through ten years, fair value | 5,852 | 7,101
Due after ten years, amortized cost | 76,951 | 129,430
Due after ten years, fair value | 64,715 | 110,592
Subtotal, amortized cost | 84,345 | 138,803
Subtotal, fair value | 71,645 | 119,447
Available-for-Sale, Amortized Cost | 84,345 | 138,803
Fair value, available for sale securities | 71,645 | 119,447
Collateralized Mortgage-Backed Securities [Member] |  |
Without single maturity date, amortized cost | 112,462 | 112,855
Without single maturity date, fair value | 100,721 | 101,248
Available-for-Sale, Amortized Cost | 112,462 | 112,855
Fair value, available for sale securities | 100,721 | 101,248
Collateralized Mortgage-Backed Securities [Member] | Federal National Mortgage Association (FNMA) [Member] |  |
Without single maturity date, amortized cost | 83,261 | 76,369
Without single maturity date, fair value | 73,097 | 66,275
Collateralized Mortgage-Backed Securities [Member] | Federal Home Loan Mortgage Corporation (FHLMC) [Member] |  |
Without single maturity date, amortized cost | 21,351 | 32,311
Without single maturity date, fair value | 20,331 | 31,376
Collateralized Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA) [Member] |  |
Without single maturity date, amortized cost | 7,850 | 4,175
Without single maturity date, fair value | 7,293 | 3,597
U.S. Small Business Administration Securities [Member] |  |
Due within one year, amortized cost | 42 | 198
Due within one year, fair value | 41 | 196
Due after one year through five years, amortized cost | 1,434 | 1,860
Due after one year through five years, fair value | 1,373 | 1,824
Due after five years through ten years, amortized cost | 6,858 | 21,420
Due after five years through ten years, fair value | 6,648 | 20,929
Due after ten years, amortized cost | 9,269 | 19,408
Due after ten years, fair value | 8,453 | 18,399
Subtotal, amortized cost | 17,603 | 42,886
Subtotal, fair value | 16,515 | 41,348
Available-for-Sale, Amortized Cost | 17,603 | 42,886
Fair value, available for sale securities | $ 16,515 | $ 41,348

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