Note 3 - Loans and Allowance for Loan Losses - Activity for Troubled Debt Restructurings (Details) - USD ($)		12 Months Ended
		Dec. 31, 2022		Dec. 31, 2021	Dec. 31, 2020
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Beginning Balance		$ 4,973,000		$ 6,414,000	$ 8,587,000
Charge-Offs		(95,000)		(17,000)	0
Payments		(772,000)		(4,278,000)	(11,260,000)
Transfers to ORE		0		0	0
Net Additions/Deletions		4,566,000		2,854,000	9,087,000
Ending Balance		8,672,000		4,973,000	6,414,000
Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]
Beginning Balance		0		0	85,000
Charge-Offs		0		0	0
Payments		0		0	(85,000)
Transfers to ORE		0		0	0
Net Additions/Deletions		0		0	0
Ending Balance		0		0	0
Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member]
Beginning Balance		10,435,000		14,797,000	1,145,000
Charge-Offs		(39,000)		0	0
Payments		(9,683,000)		(5,048,000)	(3,765,000)
Transfers to ORE		0		0	0
Net Additions/Deletions		(669,000)		686,000	17,417,000
Ending Balance		44,000		10,435,000	14,797,000
Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member]
Beginning Balance		146,000		480,000	178,000
Charge-Offs		0		0	0
Payments		(16,000)		(334,000)	(585,000)
Transfers to ORE		0		0	0
Net Additions/Deletions		0		0	887,000
Ending Balance		130,000		146,000	480,000
Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member]
Beginning Balance		91,000		0	7,000
Charge-Offs		0		0	0
Payments		(91,000)		(1,000)	(7,000)
Transfers to ORE		0		0	0
Net Additions/Deletions		0		92,000	0
Ending Balance		0		91,000	0
Retail Portfolio Segment [Member] | Other Consumer Loans [Member]
Beginning Balance		1,202,000
Charge-Offs		0
Payments		(14,000)
Transfers to ORE		0
Net Additions/Deletions	[1]	(1,187,000)
Ending Balance		1,000		1,202,000
Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member]
Beginning Balance		627,000		806,000	724,000
Charge-Offs		0		0	0
Payments		(317,000)		(224,000)	(68,000)
Transfers to ORE		0		0	0
Net Additions/Deletions		2,426,000	[1]	45,000	150,000
Ending Balance		2,736,000		627,000	806,000
Retail Portfolio Segment [Member] | Home Equity and Other [Member]
Beginning Balance		$ 1,202,000		1,146,000	1,415,000
Charge-Offs				0	0
Payments				(426,000)	(881,000)
Transfers to ORE				0	0
Net Additions/Deletions				482,000	612,000
Ending Balance				$ 1,202,000	$ 1,146,000

[1] Includes $1.2 million in the transfer of home equity lines of credit from other consumer loans to 1-4 family mortgages in association with the adoption of the CECL methodology effective January 1, 2022.