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Note 5 - Core Deposit and Customer List Intangible Assets - Changes in the Net Carrying Amount of Intangibles (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Amortization $ (915) $ (1,052) $ (2,744) $ (3,155)
Core Deposits [Member]        
Balance at beginning of period 7,833 10,601 8,978 11,944
Amortization (573) (672) (1,718) (2,015)
Balance at end of period 7,260 9,929 7,260 9,929
Customer Lists [Member]        
Balance at beginning of period 6,156 7,600 6,840 8,360
Amortization (342) (380) (1,026) (1,140)
Balance at end of period $ 5,814 $ 7,220 $ 5,814 $ 7,220