Note 3 - Accumulated Other Comprehensive Income - Amount Reclassified from Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Gain (loss) on sale of investment securities	$ 0	$ 0	$ 0	$ (1)
Income before income taxes	5,760	5,930	17,212	20,149
Provision for income taxes	793	590	2,252	2,407
Net income	4,967	5,340	14,960	17,742
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	0	0	(1)
Interest income on investment securities	(591)	(577)	(1,758)	(1,718)
Income before income taxes	(591)	(577)	(1,758)	(1,719)
Provision for income taxes	124	121	370	361
Net income	$ (467)	$ (456)	$ (1,388)	$ (1,358)