Note 4 - Loans/Leases Receivable - Related Party Loans (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Loans/Leases Receivable
Threshold for related party loans evaluated	$ 60,000	$ 60,000	$ 60,000
Balance, beginning	113,200,000	100,898,000	100,361,000
Net increase (decrease) due to change in related parties	2,200,000	3,496,000	(18,832,000)
Advances	23,977,000	51,683,000	42,817,000
Repayments	(13,414,000)	(42,877,000)	(23,448,000)
Balance, ending	$ 125,963,000	$ 113,200,000	$ 100,898,000