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Note 6 - Investment and Equity Securities - Gross Unrealized Losses and Fair Value (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Less than Twelve Months, Fair Value $ 1,753 $ 28,074
Less than Twelve Months, Gross Unrealized Losses (26) (904)
Twelve Months or Greater, Fair Value 136,838 128,372
Twelve Months or Greater, Gross Unrealized Losses (24,017) (24,577)
Total, Fair Value 138,590 156,446
Total, Gross Unrealized Losses (24,044) (25,481)
Subordinated Debt Securities [Member]    
Less than Twelve Months, Fair Value 727 10,632
Less than Twelve Months, Gross Unrealized Losses (23) (368)
Twelve Months or Greater, Fair Value 19,761 20,770
Twelve Months or Greater, Gross Unrealized Losses (989) (1,530)
Total, Fair Value 20,487 31,402
Total, Gross Unrealized Losses (1,013) (1,898)
Nontaxable Municipal Bonds [Member]    
Less than Twelve Months, Fair Value 0 15,456
Less than Twelve Months, Gross Unrealized Losses 0 (487)
Twelve Months or Greater, Fair Value 111,984 102,484
Twelve Months or Greater, Gross Unrealized Losses (22,499) (22,318)
Total, Fair Value 111,984 117,940
Total, Gross Unrealized Losses (22,499) (22,805)
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]    
Less than Twelve Months, Fair Value 1,026 1,986
Less than Twelve Months, Gross Unrealized Losses (3) (49)
Twelve Months or Greater, Fair Value 5,093 5,118
Twelve Months or Greater, Gross Unrealized Losses (529) (729)
Total, Fair Value 6,119 7,104
Total, Gross Unrealized Losses $ (532) $ (778)