Note 3 - Accumulated Other Comprehensive Income - Amount Reclassified from Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Gain (loss) on sale of investment securities	$ 0	$ 0	$ (1)	$ 0
Provision for income taxes	605	1,412	1,817	2,556
Net income	5,362	7,664	12,402	15,187
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	(1)	0
Provision for income taxes	0	0	0	0
Net income	$ 0	$ 0	$ (1)	$ 0