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		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Balance	$ 42,877,000	$ 35,153,000	$ 42,246,000	$ 35,363,000
Financing Receivable, Credit Loss, Expense (Reversal)	2,000,000	500,000	2,600,000	600,000
Charge-offs	(461,000)	(15,000)	(567,000)	(220,000)
Recoveries	305,000	336,000	442,000	631,000
Balance	44,721,000	35,974,000	44,721,000	35,974,000
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	10,181,000	8,413,000	10,203,000	10,782,000
Financing Receivable, Credit Loss, Expense (Reversal)	(3,616,000)	150,000	(3,623,000)	(592,000)
Charge-offs	(182,000)	0	(218,000)	(171,000)
Recoveries	89,000	45,000	110,000	160,000
Balance	6,472,000	8,608,000	6,472,000	8,608,000
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	510,000	455,000	490,000	420,000
Financing Receivable, Credit Loss, Expense (Reversal)	(217,000)	(10,000)	(198,000)	96,000
Charge-offs	0	0	0	(29,000)
Recoveries	11,000	1,000	12,000	2,000
Balance	304,000	446,000	304,000	446,000
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	5,711,000	5,803,000	5,914,000	6,045,000
Financing Receivable, Credit Loss, Expense (Reversal)	105,000	(251,000)	(132,000)	35,000
Charge-offs	0	0	(14,000)	0
Recoveries	22,000	26,000	70,000	58,000
Balance	5,838,000	5,578,000	5,838,000	5,578,000
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	9,168,000	9,932,000	9,242,000	12,990,000
Financing Receivable, Credit Loss, Expense (Reversal)	(479,000)	(683,000)	(553,000)	(1,207,000)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Balance	8,689,000	9,249,000	8,689,000	9,249,000
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	2,427,000	1,666,000	2,191,000	2,006,000
Financing Receivable, Credit Loss, Expense (Reversal)	1,268,000	(33,000)	1,497,000	240,000
Charge-offs	0	0	0	0
Recoveries	5,000	6,000	12,000	14,000
Balance	3,700,000	1,639,000	3,700,000	1,639,000
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	14,648,000	8,562,000	14,027,000	2,449,000
Financing Receivable, Credit Loss, Expense (Reversal)	4,973,000	1,464,000	5,591,000	2,057,000
Charge-offs	(270,000)	0	(312,000)	(2,000)
Recoveries	147,000	241,000	192,000	368,000
Balance	19,498,000	10,267,000	19,498,000	10,267,000
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	156,000	191,000	160,000	626,000
Financing Receivable, Credit Loss, Expense (Reversal)	21,000	(28,000)	16,000	(61,000)
Charge-offs	(9,000)	(15,000)	(23,000)	(18,000)
Recoveries	31,000	17,000	46,000	29,000
Balance	199,000	165,000	199,000	165,000
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	76,000	131,000	19,000	45,000
Financing Receivable, Credit Loss, Expense (Reversal)	(55,000)	(109,000)	2,000	32,000
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Balance	$ 21,000	$ 22,000	$ 21,000	22,000
Unallocated Financing Receivables [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Balance				$ (55,000)