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Note 3 - Accumulated Other Comprehensive Income - Amount Reclassified from Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Gain (loss) on sale of investment securities $ 0 $ (1)
Income before income taxes 5,751 8,252
Provision for income taxes 694 1,212
Net income 5,057 7,040
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]    
Gain (loss) on sale of investment securities 0 (1)
Interest income on investment securities (584) (572)
Income before income taxes (584) (573)
Provision for income taxes 123 120
Net income $ (461) $ (453)