Note 3 - Loans and Allowance for Credit Losses - Activity in Allowance for Loan Losses and the Recorded Investments in Loans (Details) - USD ($)	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Balance	$ 42,246,000	$ 35,363,000
Financing Receivable, Credit Loss, Expense (Reversal)	600,000	100,000
Charge-offs	(106,000)	(205,000)
Recoveries	137,000	295,000
Balance	42,877,000	35,153,000
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance		(400,000)
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Balance	10,203,000	10,782,000
Financing Receivable, Credit Loss, Expense (Reversal)	(7,000)	(742,000)
Charge-offs	(36,000)	(170,000)
Recoveries	21,000	114,000
Balance	10,181,000	8,413,000
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance		(1,571,000)
Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member]
Balance	490,000	420,000
Financing Receivable, Credit Loss, Expense (Reversal)	19,000	106,000
Charge-offs	0	(29,000)
Recoveries	1,000	1,000
Balance	510,000	455,000
Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance		(43,000)
Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member]
Balance	5,914,000	6,045,000
Financing Receivable, Credit Loss, Expense (Reversal)	(237,000)	286,000
Charge-offs	(14,000)	0
Recoveries	48,000	32,000
Balance	5,711,000	5,803,000
Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance		(560,000)
Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member]
Balance	10,164,000	13,301,000
Financing Receivable, Credit Loss, Expense (Reversal)	131,000	(445,000)
Charge-offs	0	0
Recoveries	0	0
Balance	10,295,000	10,322,000
Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance		(2,534,000)
Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member]
Balance	1,269,000	1,695,000
Financing Receivable, Credit Loss, Expense (Reversal)	24,000	194,000
Charge-offs	0	0
Recoveries	7,000	8,000
Balance	1,300,000	1,276,000
Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residential Rental Loan [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance		(621,000)
Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member]
Balance	14,027,000	2,449,000
Financing Receivable, Credit Loss, Expense (Reversal)	618,000	593,000
Charge-offs	(42,000)	(2,000)
Recoveries	45,000	127,000
Balance	14,648,000	8,562,000
Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance		5,395,000
Retail Portfolio Segment [Member] | Other Consumer Loans [Member]
Balance	160,000	626,000
Financing Receivable, Credit Loss, Expense (Reversal)	(5,000)	(33,000)
Charge-offs	(14,000)	(4,000)
Recoveries	15,000	13,000
Balance	156,000	191,000
Retail Portfolio Segment [Member] | Other Consumer Loans [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance		(411,000)
Unallocated Financing Receivables [Member]
Balance	19,000	45,000
Financing Receivable, Credit Loss, Expense (Reversal)	57,000	141,000
Charge-offs	0	0
Recoveries	0	0
Balance	$ 76,000	131,000
Unallocated Financing Receivables [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance		$ (55,000)