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Note 3 - Investments - Schedule of Investments in Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Less than 12 months, fair value, available for sale securities $ 58,754 $ 91,176
Less than 12 months, unrealized loss, available for sale securities (637) (10,266)
12 months or longer, unrealized loss, fair value, available for sale securities 209,362 133,700
12 months or longer, unrealized loss, available for sale securities (36,064) (32,323)
Available for sale securities, fair value 268,116 224,876
Available for sale securities, total (36,701) (42,589)
Less than 12 months, fair value, held to maturity 0 7,929
Less than 12 months, held to maturity securities 0 (571)
12 months or longer, unrealized loss, fair value, held to maturity securities 7,666 0
12 months or longer, unrealized loss, held to maturity securities (834) 0
Held to maturity securities, fair value 7,666 7,929
Held-to-maturity, total (834) (571)
Less than 12 months, fair value 58,754 99,105
Less than 12 months, unrealized loss (637) (10,837)
12 months or longer, fair value 217,028 133,700
12 months or longer, unrealized loss (36,898) (32,323)
Debt Securities, fair value 275,782 232,805
Debt securities, unrealized loss (37,535) (43,160)
US Government Agencies Debt Securities [Member]    
Less than 12 months, fair value, available for sale securities 0 3,823
Less than 12 months, unrealized loss, available for sale securities 0 (118)
12 months or longer, unrealized loss, fair value, available for sale securities 15,972 13,465
12 months or longer, unrealized loss, available for sale securities (3,179) (3,747)
Available for sale securities, fair value 15,972 17,288
Available for sale securities, total (3,179) (3,865)
Corporate Debt Securities [Member]    
Less than 12 months, fair value, available for sale securities 959 2,494
Less than 12 months, unrealized loss, available for sale securities (41) (4)
12 months or longer, unrealized loss, fair value, available for sale securities 4,300 4,026
12 months or longer, unrealized loss, available for sale securities (700) (975)
Available for sale securities, fair value 5,259 6,520
Available for sale securities, total (741) (979)
Less than 12 months, fair value, held to maturity 0 7,929
Less than 12 months, held to maturity securities 0 (571)
12 months or longer, unrealized loss, fair value, held to maturity securities 7,666 0
12 months or longer, unrealized loss, held to maturity securities (834) 0
Held to maturity securities, fair value 7,666 7,929
Held-to-maturity, total (834) (571)
Municipal Bonds [Member]    
Less than 12 months, fair value, available for sale securities 3,922 44,261
Less than 12 months, unrealized loss, available for sale securities (23) (5,794)
12 months or longer, unrealized loss, fair value, available for sale securities 113,577 73,990
12 months or longer, unrealized loss, available for sale securities (19,375) (17,825)
Available for sale securities, fair value 117,499 118,251
Available for sale securities, total (19,398) (23,619)
Collateralized Mortgage-Backed Securities [Member]    
Less than 12 months, fair value, available for sale securities 20,662 29,791
Less than 12 months, unrealized loss, available for sale securities (113) (3,188)
12 months or longer, unrealized loss, fair value, available for sale securities 67,376 40,175
12 months or longer, unrealized loss, available for sale securities (11,732) (9,270)
Available for sale securities, fair value 88,038 69,966
Available for sale securities, total (11,845) (12,458)
U.S. Small Business Administration Securities [Member]    
Less than 12 months, fair value, available for sale securities 33,211 10,807
Less than 12 months, unrealized loss, available for sale securities (460) (1,162)
12 months or longer, unrealized loss, fair value, available for sale securities 8,137 2,044
12 months or longer, unrealized loss, available for sale securities (1,078) (506)
Available for sale securities, fair value 41,348 12,851
Available for sale securities, total $ (1,538) $ (1,668)