Note 5 - Loans and the Allowance for Credit Losses - Allowance for Credit Losses (Details) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Balance, beginning of year	$ 10,717,000	$ 10,352,000
Provision charged to operations	2,575,000	1,300,000
Losses charged to allowance	(1,802,000)	(1,461,000)
Recoveries	848,000	526,000
Balance, end of year	12,867,000	10,717,000
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member]
Balance, beginning of year	$ 529,000	0
Balance, end of year		$ 529,000