Note 5 - Loans and ACL for Loans - Loans to Directors and Their Associates (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Balance at beginning of period	$ 78,685	$ 53,574
Effect of change in composition of directors and executive officers	(97)	1,124
New term loans	0	15,000
Repayment of term loans	(1,216)	(1,588)
Changes in balances of revolving lines of credit	(14,960)	10,575
Balance at end of period	$ 62,412	$ 78,685