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Note 3 - Investments - Schedule of Contractual Maturities (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Available-for-Sale, Amortized Cost $ 309,959 $ 328,695
Fair value, available for sale securities 279,643 292,933
Total securities held-to-maturity, amortized cost 8,500 8,500
Total securities held-to-maturity, fair value 7,785 7,666
Total securities 318,459 337,195
Total securities, fair value 287,428 300,599
US Government Agencies Debt Securities [Member]    
Due within one year, amortized cost 917 922
Due within one year, fair value 914 914
Due after one year through five years, amortized cost 3,951 3,947
Due after one year through five years, fair value 3,537 3,544
Due after five years through ten years, amortized cost 11,973 11,972
Due after five years through ten years, fair value 10,067 10,139
Due after ten years, amortized cost 4,310 4,310
Due after ten years, fair value 3,380 3,421
Subtotal, amortized cost 21,151 21,151
Subtotal, fair value 17,898 18,018
Available-for-Sale, Amortized Cost 21,151 21,151
Fair value, available for sale securities 17,898 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 9,985 6,609
Due after five years through ten years, amortized cost 4,000 4,000
Due after five years through ten years, fair value 3,822 3,839
Due after ten years, amortized cost 2,000 2,000
Due after ten years, fair value 1,393 1,420
Subtotal, amortized cost 16,000 13,000
Subtotal, fair value 15,200 12,872
Available-for-Sale, Amortized Cost 16,000 13,000
Fair value, available for sale securities 15,200 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 7,785 7,666
Municipal Bonds [Member]    
Due within one year, amortized cost 1,006 1,013
Due within one year, fair value 1,000 1,003
Due after one year through five years, amortized cost 82 757
Due after one year through five years, fair value 81 751
Due after five years through ten years, amortized cost 4,037 7,603
Due after five years through ten years, fair value 3,836 7,101
Due after ten years, amortized cost 81,132 129,430
Due after ten years, fair value 68,636 110,592
Subtotal, amortized cost 86,257 138,803
Subtotal, fair value 73,553 119,447
Available-for-Sale, Amortized Cost 86,257 138,803
Fair value, available for sale securities 73,553 119,447
Collateralized Mortgage-Backed Securities [Member]    
Without single maturity date, amortized cost 131,594 112,855
Without single maturity date, fair value 119,802 101,248
Available-for-Sale, Amortized Cost 131,594 112,855
Fair value, available for sale securities 119,802 101,248
Collateralized Mortgage-Backed Securities [Member] | Federal National Mortgage Association (FNMA) [Member]    
Without single maturity date, amortized cost 83,863 76,369
Without single maturity date, fair value 73,301 66,275
Collateralized Mortgage-Backed Securities [Member] | Federal Home Loan Mortgage Corporation (FHLMC) [Member]    
Without single maturity date, amortized cost 36,178 32,311
Without single maturity date, fair value 35,532 31,376
Collateralized Mortgage-Backed Securities [Member] | Government National Mortgage Association (GNMA) [Member]    
Without single maturity date, amortized cost 11,553 4,175
Without single maturity date, fair value 10,969 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 1,656 1,860
Due after one year through five years, fair value 1,584 1,824
Due after five years through ten years, amortized cost 27,916 21,420
Due after five years through ten years, fair value 27,317 20,929
Due after ten years, amortized cost 25,343 19,408
Due after ten years, fair value 24,248 18,399
Subtotal, amortized cost 54,957 42,886
Subtotal, fair value 53,190 41,348
Available-for-Sale, Amortized Cost 54,957 42,886
Fair value, available for sale securities $ 53,190 $ 41,348