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Note 2 - Investments - Schedule of Investments in Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Less than 12 months, fair value, available for sale securities $ 17,206 $ 58,754
Less than 12 months, unrealized loss, available for sale securities (218) (637)
12 months or longer, unrealized loss, fair value, available for sale securities 166,120 209,362
12 months or longer, unrealized loss, available for sale securities (24,294) (36,064)
Available for sale securities, fair value, total 183,326 268,116
Available for sale securities, unrealized losses total (24,512) (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 7,983 7,666
12 months or longer, unrealized loss, held to maturity securities (517) (834)
Held to maturity securities, fair value, total 7,983 7,666
Held-to-maturity, total (517) (834)
Less than 12 months, fair value 17,206 58,754
Less than 12 months, unrealized loss (218) (637)
12 months or longer, fair value 174,103 217,028
12 months or longer, unrealized loss (24,811) (36,898)
Debt Securities, fair value, total 191,309 275,782
Debt securities, unrealized loss, total (25,029) (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 15,653 15,972
12 months or longer, unrealized loss, available for sale securities (2,590) (3,179)
Available for sale securities, fair value, total 15,653 15,972
Available for sale securities, unrealized losses total (2,590) (3,179)
Corporate Debt Securities [Member]    
Less than 12 months, fair value, available for sale securities 3,864 959
Less than 12 months, unrealized loss, available for sale securities (136) (41)
12 months or longer, unrealized loss, fair value, available for sale securities 5,400 4,300
12 months or longer, unrealized loss, available for sale securities (600) (700)
Available for sale securities, fair value, total 9,264 5,259
Available for sale securities, unrealized losses total (736) (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 7,983 7,666
12 months or longer, unrealized loss, held to maturity securities (517) (834)
Held to maturity securities, fair value, total 7,983 7,666
Held-to-maturity, total (517) (834)
Municipal Bonds [Member]    
Less than 12 months, fair value, available for sale securities 44 3,922
Less than 12 months, unrealized loss, available for sale securities 0 (23)
12 months or longer, unrealized loss, fair value, available for sale securities 70,584 113,577
12 months or longer, unrealized loss, available for sale securities (10,738) (19,375)
Available for sale securities, fair value, total 70,628 117,499
Available for sale securities, unrealized losses total (10,738) (19,398)
Collateralized Mortgage-Backed Securities [Member]    
Less than 12 months, fair value, available for sale securities 9,492 20,662
Less than 12 months, unrealized loss, available for sale securities (37) (113)
12 months or longer, unrealized loss, fair value, available for sale securities 67,032 67,376
12 months or longer, unrealized loss, available for sale securities (9,441) (11,732)
Available for sale securities, fair value, total 76,524 88,038
Available for sale securities, unrealized losses total (9,478) (11,845)
U.S. Small Business Administration Securities [Member]    
Less than 12 months, fair value, available for sale securities 3,806 33,211
Less than 12 months, unrealized loss, available for sale securities (45) (460)
12 months or longer, unrealized loss, fair value, available for sale securities 7,451 8,137
12 months or longer, unrealized loss, available for sale securities (925) (1,078)
Available for sale securities, fair value, total 11,257 41,348
Available for sale securities, unrealized losses total $ (970) $ (1,538)