Note 3 - Loans and Allowance for Loan Losses - Nonaccrual Loans (Details) - USD ($)	Sep. 30, 2023	Dec. 31, 2022
With no related allowance recorded, principal balance	$ 2,353,000	$ 1,313,000
With related allowance recorded, principal balance	3,536,000	6,415,000
Related allowance	1,425,000	2,283,000
Nonaccrual loans	5,889,000	7,728,000
Commercial Portfolio Segment [Member]
With no related allowance recorded, principal balance	987,000	249,000
With related allowance recorded, principal balance	3,039,000	6,023,000
Related allowance	1,233,000	2,083,000
Nonaccrual loans	4,026,000	6,272,000
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
With no related allowance recorded, principal balance	249,000	249,000
With related allowance recorded, principal balance	3,039,000	5,775,000
Related allowance	1,233,000	2,051,000
Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]
With no related allowance recorded, principal balance	0	0
With related allowance recorded, principal balance	0	0
Related allowance	0	0
Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member]
With no related allowance recorded, principal balance	738,000	0
With related allowance recorded, principal balance	0	248,000
Related allowance	0	32,000
Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member]
With no related allowance recorded, principal balance	0	0
With related allowance recorded, principal balance	0	0
Related allowance	0	0
Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member]
With no related allowance recorded, principal balance	0	0
With related allowance recorded, principal balance	0	0
Related allowance	0	0
Retail Portfolio Segment [Member]
With no related allowance recorded, principal balance	1,366,000	1,064,000
With related allowance recorded, principal balance	497,000	392,000
Related allowance	192,000	200,000
Nonaccrual loans	1,863,000	1,456,000
Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member]
With no related allowance recorded, principal balance	1,366,000	1,064,000
With related allowance recorded, principal balance	497,000	392,000
Related allowance	192,000	200,000
Retail Portfolio Segment [Member] | Other Consumer Loans [Member]
With no related allowance recorded, principal balance	0	0
With related allowance recorded, principal balance	0	0
Related allowance	$ 0	$ 0