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Note 7 - Investment and Equity Securities - Gross Unrealized Losses and Fair Value (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Less than Twelve Months, Fair Value $ 94,863 $ 33,423
Less than Twelve Months, Gross Unrealized Losses (9,185) (441)
Twelve Months or Greater, Fair Value 4,216 2,711
Twelve Months or Greater, Gross Unrealized Losses (375) (99)
Total, Fair Value 99,079 36,134
Total, Gross Unrealized Losses (9,560) (540)
Subordinated Debt Securities [Member]    
Less than Twelve Months, Fair Value 13,157 9,150
Less than Twelve Months, Gross Unrealized Losses (543) (100)
Twelve Months or Greater, Fair Value 1,299 731
Twelve Months or Greater, Gross Unrealized Losses (50) (19)
Total, Fair Value 14,456 9,881
Total, Gross Unrealized Losses (593) (119)
Nontaxable Municipal Bonds [Member]    
Less than Twelve Months, Fair Value 76,809 24,273
Less than Twelve Months, Gross Unrealized Losses (8,535) (341)
Twelve Months or Greater, Fair Value 1,086 0
Twelve Months or Greater, Gross Unrealized Losses (127) 0
Total, Fair Value 77,895 24,273
Total, Gross Unrealized Losses (8,662) (341)
Mortgage-Backed Securities, Issued by US Government Sponsored Enterprises [Member]    
Less than Twelve Months, Fair Value 4,897 0
Less than Twelve Months, Gross Unrealized Losses (107) 0
Twelve Months or Greater, Fair Value 1,831 1,980
Twelve Months or Greater, Gross Unrealized Losses (198) (80)
Total, Fair Value 6,728 1,980
Total, Gross Unrealized Losses $ (305) $ (80)