Note 3 - Accumulated Other Comprehensive Income - Amount Reclassified from Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Gain (loss) on sale of investment securities	$ 4	$ 46	$ 115
Provision for income taxes	5,447	4,001	2,249
Net income	30,021	24,008	13,035
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	4	46	115
Provision for income taxes	(1)	(10)	(24)
Net income	$ 3	$ 36	$ 91