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Note 6 - Investment and Equity Securities - Gross Unrealized Losses and Fair Value (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Less than Twelve Months, Fair Value $ 28,074 $ 2,575
Less than Twelve Months, Gross Unrealized Losses (904) (17)
Twelve Months or Greater, Fair Value 128,372 141,556
Twelve Months or Greater, Gross Unrealized Losses (24,577) (20,573)
Total, Fair Value 156,446 144,131
Total, Gross Unrealized Losses (25,481) (20,590)
Subordinated Debt Securities [Member]    
Less than Twelve Months, Fair Value 10,632 994
Less than Twelve Months, Gross Unrealized Losses (368) (6)
Twelve Months or Greater, Fair Value 20,770 29,356
Twelve Months or Greater, Gross Unrealized Losses (1,530) (2,445)
Total, Fair Value 31,402 30,350
Total, Gross Unrealized Losses (1,898) (2,451)
Nontaxable Municipal Bonds [Member]    
Less than Twelve Months, Fair Value 15,456 1,386
Less than Twelve Months, Gross Unrealized Losses (487) (10)
Twelve Months or Greater, Fair Value 102,484 106,078
Twelve Months or Greater, Gross Unrealized Losses (22,318) (17,482)
Total, Fair Value 117,940 107,464
Total, Gross Unrealized Losses (22,805) (17,492)
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]    
Less than Twelve Months, Fair Value 1,986 195
Less than Twelve Months, Gross Unrealized Losses (49) (1)
Twelve Months or Greater, Fair Value 5,118 6,122
Twelve Months or Greater, Gross Unrealized Losses (729) (646)
Total, Fair Value 7,104 6,317
Total, Gross Unrealized Losses $ (778) $ (647)