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Note 3 - Investments - Schedule of Investments in Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Less than 12 months, fair value, available for sale securities $ 79,874 $ 58,754
Less than 12 months, unrealized loss, available for sale securities (816) (637)
12 months or longer, unrealized loss, fair value, available for sale securities 165,595 209,362
12 months or longer, unrealized loss, available for sale securities (29,825) (36,064)
Available for sale securities, fair value, total 245,469 268,116
Available for sale securities, unrealized losses total (30,641) (36,701)
Less than 12 months, fair value, held to maturity 0 0
Less than 12 months, held to maturity securities 0 0
12 months or longer, unrealized loss, fair value, held to maturity securities 7,785 7,666
12 months or longer, unrealized loss, held to maturity securities (715) (834)
Held to maturity securities, fair value, total 7,785 7,666
Held-to-maturity, total (715) (834)
Less than 12 months, fair value 79,874 58,754
Less than 12 months, unrealized loss (816) (637)
12 months or longer, fair value 173,380 217,028
12 months or longer, unrealized loss (30,540) (36,898)
Debt Securities, fair value, total 253,254 275,782
Debt securities, unrealized loss, total (31,356) (37,535)
US Government Agencies Debt Securities [Member]    
Less than 12 months, fair value, available for sale securities 0 0
Less than 12 months, unrealized loss, available for sale securities 0 0
12 months or longer, unrealized loss, fair value, available for sale securities 15,853 15,972
12 months or longer, unrealized loss, available for sale securities (3,298) (3,179)
Available for sale securities, fair value, total 15,853 15,972
Available for sale securities, unrealized losses total (3,298) (3,179)
Corporate Debt Securities [Member]    
Less than 12 months, fair value, available for sale securities 7,846 959
Less than 12 months, unrealized loss, available for sale securities (154) (41)
12 months or longer, unrealized loss, fair value, available for sale securities 4,263 4,300
12 months or longer, unrealized loss, available for sale securities (736) (700)
Available for sale securities, fair value, total 12,109 5,259
Available for sale securities, unrealized losses total (890) (741)
Less than 12 months, fair value, held to maturity 0 0
Less than 12 months, held to maturity securities 0 0
12 months or longer, unrealized loss, fair value, held to maturity securities 7,785 7,666
12 months or longer, unrealized loss, held to maturity securities (715) (834)
Held to maturity securities, fair value, total 7,785 7,666
Held-to-maturity, total (715) (834)
Municipal Bonds [Member]    
Less than 12 months, fair value, available for sale securities 1,279 3,922
Less than 12 months, unrealized loss, available for sale securities (7) (23)
12 months or longer, unrealized loss, fair value, available for sale securities 71,256 113,577
12 months or longer, unrealized loss, available for sale securities (12,715) (19,375)
Available for sale securities, fair value, total 72,535 117,499
Available for sale securities, unrealized losses total (12,722) (19,398)
Collateralized Mortgage-Backed Securities [Member]    
Less than 12 months, fair value, available for sale securities 25,189 20,662
Less than 12 months, unrealized loss, available for sale securities (63) (113)
12 months or longer, unrealized loss, fair value, available for sale securities 66,593 67,376
12 months or longer, unrealized loss, available for sale securities (11,901) (11,732)
Available for sale securities, fair value, total 91,782 88,038
Available for sale securities, unrealized losses total (11,964) (11,845)
U.S. Small Business Administration Securities [Member]    
Less than 12 months, fair value, available for sale securities 45,560 33,211
Less than 12 months, unrealized loss, available for sale securities (592) (460)
12 months or longer, unrealized loss, fair value, available for sale securities 7,630 8,137
12 months or longer, unrealized loss, available for sale securities (1,175) (1,078)
Available for sale securities, fair value, total 53,190 41,348
Available for sale securities, unrealized losses total $ (1,767) $ (1,538)