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Note 7 - Investment and Equity Securities - Gross Unrealized Losses and Fair Value (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Less than Twelve Months, Fair Value $ 36,087 $ 94,134
Less than Twelve Months, Gross Unrealized Losses (1,393) (12,097)
Twelve Months or Greater, Fair Value 114,127 51,244
Twelve Months or Greater, Gross Unrealized Losses (23,070) (15,986)
Total, Fair Value 150,214 145,378
Total, Gross Unrealized Losses (24,463) (28,083)
Subordinated Debt Securities [Member]    
Less than Twelve Months, Fair Value 13,082 12,638
Less than Twelve Months, Gross Unrealized Losses (418) (1,129)
Twelve Months or Greater, Fair Value 17,923 8,790
Twelve Months or Greater, Gross Unrealized Losses (1,377) (1,010)
Total, Fair Value 31,005 21,428
Total, Gross Unrealized Losses (1,795) (2,139)
Nontaxable Municipal Bonds [Member]    
Less than Twelve Months, Fair Value 22,396 75,343
Less than Twelve Months, Gross Unrealized Losses (962) (10,488)
Twelve Months or Greater, Fair Value 89,741 41,138
Twelve Months or Greater, Gross Unrealized Losses (21,065) (14,623)
Total, Fair Value 112,137 116,481
Total, Gross Unrealized Losses (22,027) (25,111)
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Less than Twelve Months, Fair Value 609 6,153
Less than Twelve Months, Gross Unrealized Losses (13) (480)
Twelve Months or Greater, Fair Value 6,463 1,316
Twelve Months or Greater, Gross Unrealized Losses (628) (353)
Total, Fair Value 7,072 7,469
Total, Gross Unrealized Losses $ (641) $ (833)