Note 5 - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	$ 10,531	$ 11,184	$ 10,826
Provision for (credit to) loan losses		850	458
Charge-offs		(196)	(263)
Recoveries		393	163
Allowance for loan losses, end of period	8,852	10,531	11,184
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	1,316	3,368	4,050
Provision for (credit to) loan losses	(771)	(2,320)	(774)
Charge-offs	(313)	(38)	0
Recoveries	661	306	92
Allowance for loan losses, end of period	823	1,316	3,368
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Prior to adoption of ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	1,316
Allowance for loan losses, end of period		1,316
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] | Impact of adopting ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	(70)
Allowance for loan losses, end of period		(70)
Commercial Portfolio Segment [Member] | Construction and Land Development [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Provision for (credit to) loan losses	507
Charge-offs	0
Recoveries	0
Allowance for loan losses, end of period	1,252
Commercial Portfolio Segment [Member] | Construction and Land Development [Member] | Prior to adoption of ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	755
Allowance for loan losses, end of period		755
Commercial Portfolio Segment [Member] | Construction and Land Development [Member] | Impact of adopting ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	(10)
Allowance for loan losses, end of period		(10)
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	755	363	346
Provision for (credit to) loan losses		392	(17)
Charge-offs		0	0
Recoveries		0	0
Allowance for loan losses, end of period		755	363
Commercial Portfolio Segment [Member] | Real Estate Secured by Multi-Family Properties [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Provision for (credit to) loan losses	56
Charge-offs	0
Recoveries	0
Allowance for loan losses, end of period	1,735
Commercial Portfolio Segment [Member] | Real Estate Secured by Multi-Family Properties [Member] | Prior to adoption of ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	995
Allowance for loan losses, end of period		995
Commercial Portfolio Segment [Member] | Real Estate Secured by Multi-Family Properties [Member] | Impact of adopting ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	684
Allowance for loan losses, end of period		684
Commercial Portfolio Segment [Member] | Real Estate Secured By Owner-Occupied Properties [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Provision for (credit to) loan losses	(174)
Charge-offs	0
Recoveries	0
Allowance for loan losses, end of period	1,001
Commercial Portfolio Segment [Member] | Real Estate Secured By Owner-Occupied Properties [Member] | Prior to adoption of ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	1,549
Allowance for loan losses, end of period		1,549
Commercial Portfolio Segment [Member] | Real Estate Secured By Owner-Occupied Properties [Member] | Impact of adopting ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	(374)
Allowance for loan losses, end of period		(374)
Commercial Portfolio Segment [Member] | Real Estate Secured by Other Commercial Properties [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Provision for (credit to) loan losses	(163)
Charge-offs	0
Recoveries	0
Allowance for loan losses, end of period	1,167
Commercial Portfolio Segment [Member] | Real Estate Secured by Other Commercial Properties [Member] | Prior to adoption of ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	2,458
Allowance for loan losses, end of period		2,458
Commercial Portfolio Segment [Member] | Real Estate Secured by Other Commercial Properties [Member] | Impact of adopting ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	(1,128)
Allowance for loan losses, end of period		(1,128)
Commercial Portfolio Segment [Member] | Revolving real estate secured by 1-4 family properties-business
Financing Receivable Allowance For Credit Losses [Line Items]
Provision for (credit to) loan losses	(5)
Charge-offs	0
Recoveries	0
Allowance for loan losses, end of period	27
Commercial Portfolio Segment [Member] | Revolving real estate secured by 1-4 family properties-business | Prior to adoption of ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	25
Allowance for loan losses, end of period		25
Commercial Portfolio Segment [Member] | Revolving real estate secured by 1-4 family properties-business | Impact of adopting ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	7
Allowance for loan losses, end of period		7
Commercial Portfolio Segment [Member] | Real estate secured by 1st lein on 1-4 family properties-business
Financing Receivable Allowance For Credit Losses [Line Items]
Provision for (credit to) loan losses	(203)
Charge-offs	0
Recoveries	10
Allowance for loan losses, end of period	1,507
Commercial Portfolio Segment [Member] | Real estate secured by 1st lein on 1-4 family properties-business | Prior to adoption of ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	1,210
Allowance for loan losses, end of period		1,210
Commercial Portfolio Segment [Member] | Real estate secured by 1st lein on 1-4 family properties-business | Impact of adopting ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	490
Allowance for loan losses, end of period		490
Commercial Portfolio Segment [Member] | Real estate secured by junior lein on 1-4 family properties-business
Financing Receivable Allowance For Credit Losses [Line Items]
Provision for (credit to) loan losses	(2)
Charge-offs	0
Recoveries	0
Allowance for loan losses, end of period	14
Commercial Portfolio Segment [Member] | Real estate secured by junior lein on 1-4 family properties-business | Prior to adoption of ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	30
Allowance for loan losses, end of period		30
Commercial Portfolio Segment [Member] | Real estate secured by junior lein on 1-4 family properties-business | Impact of adopting ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	(14)
Allowance for loan losses, end of period		(14)
Commercial Portfolio Segment [Member] | Secured by Commercial Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	5,002	4,280	3,736
Provision for (credit to) loan losses		722	544
Charge-offs		0	0
Recoveries		0	0
Allowance for loan losses, end of period		5,002	4,280
Commercial Portfolio Segment [Member] | Secured by Residential Real Estate [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	1,240	1,035	871
Provision for (credit to) loan losses		160	181
Charge-offs		0	(38)
Recoveries		45	21
Allowance for loan losses, end of period		1,240	1,035
State and Political Subdivisions Portfolio Segment [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	94	69	89
Provision for (credit to) loan losses	(19)	(25)	(20)
Charge-offs	0	0	0
Recoveries	0	0	0
Allowance for loan losses, end of period	55	94	69
State and Political Subdivisions Portfolio Segment [Member] | Prior to adoption of ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	94
Allowance for loan losses, end of period		94
State and Political Subdivisions Portfolio Segment [Member] | Impact of adopting ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	(20)
Allowance for loan losses, end of period		(20)
Retail Portfolio Segment [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Provision for (credit to) loan losses	(828)
Charge-offs	(475)
Recoveries	713
Allowance for loan losses, end of period	8,852
Retail Portfolio Segment [Member] | Prior to adoption of ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	10,531
Allowance for loan losses, end of period		10,531
Retail Portfolio Segment [Member] | Impact of adopting ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	(1,089)
Allowance for loan losses, end of period		(1,089)
Retail Portfolio Segment [Member] | Consumer Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	502	542	265
Provision for (credit to) loan losses		82	410
Charge-offs		(158)	(176)
Recoveries		36	43
Allowance for loan losses, end of period		502	542
Retail Portfolio Segment [Member] | Family Residential Mortgages [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	683	646	533
Provision for (credit to) loan losses	(59)	37	(113)
Charge-offs	0	0	0
Recoveries	0	0	0
Allowance for loan losses, end of period	427	683	646
Retail Portfolio Segment [Member] | Family Residential Mortgages [Member] | Prior to adoption of ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	682
Allowance for loan losses, end of period		682
Retail Portfolio Segment [Member] | Family Residential Mortgages [Member] | Impact of adopting ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	(196)
Allowance for loan losses, end of period		(196)
Retail Portfolio Segment [Member] | Construction - Individual [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Provision for (credit to) loan losses	(1)
Charge-offs	0
Recoveries	0
Allowance for loan losses, end of period	0
Retail Portfolio Segment [Member] | Construction - Individual [Member] | Prior to adoption of ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	1
Allowance for loan losses, end of period		1
Retail Portfolio Segment [Member] | Construction - Individual [Member] | Impact of adopting ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period
Allowance for loan losses, end of period
Retail Portfolio Segment [Member] | Revolving home equity secured by 1-4 family properties-personal
Financing Receivable Allowance For Credit Losses [Line Items]
Provision for (credit to) loan losses	(154)
Charge-offs	0
Recoveries	0
Allowance for loan losses, end of period	138
Retail Portfolio Segment [Member] | Revolving home equity secured by 1-4 family properties-personal | Prior to adoption of ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	299
Allowance for loan losses, end of period		299
Retail Portfolio Segment [Member] | Revolving home equity secured by 1-4 family properties-personal | Impact of adopting ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	(7)
Allowance for loan losses, end of period		(7)
Retail Portfolio Segment [Member] | Real Estate Secured By 1st Lein on 1-4 Family Properties-Personal
Financing Receivable Allowance For Credit Losses [Line Items]
Provision for (credit to) loan losses	110
Charge-offs	0
Recoveries	0
Allowance for loan losses, end of period	182
Retail Portfolio Segment [Member] | Real Estate Secured By 1st Lein on 1-4 Family Properties-Personal | Prior to adoption of ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	57
Allowance for loan losses, end of period		57
Retail Portfolio Segment [Member] | Real Estate Secured By 1st Lein on 1-4 Family Properties-Personal | Impact of adopting ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	15
Allowance for loan losses, end of period		15
Retail Portfolio Segment [Member] | Real estate secured by junior lein on 1-4 family properties-personal
Financing Receivable Allowance For Credit Losses [Line Items]
Provision for (credit to) loan losses	15
Charge-offs	0
Recoveries	6
Allowance for loan losses, end of period	105
Retail Portfolio Segment [Member] | Real estate secured by junior lein on 1-4 family properties-personal | Prior to adoption of ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	55
Allowance for loan losses, end of period		55
Retail Portfolio Segment [Member] | Real estate secured by junior lein on 1-4 family properties-personal | Impact of adopting ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	29
Allowance for loan losses, end of period		29
Retail Portfolio Segment [Member] | Student Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Provision for (credit to) loan losses	(48)
Charge-offs	(57)
Recoveries	8
Allowance for loan losses, end of period	369
Retail Portfolio Segment [Member] | Student Loans [Member] | Prior to adoption of ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	454
Allowance for loan losses, end of period		454
Retail Portfolio Segment [Member] | Student Loans [Member] | Impact of adopting ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	12
Allowance for loan losses, end of period		12
Retail Portfolio Segment [Member] | Overdrafts [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Provision for (credit to) loan losses	70
Charge-offs	(91)
Recoveries	26
Allowance for loan losses, end of period	16
Retail Portfolio Segment [Member] | Overdrafts [Member] | Prior to adoption of ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	8
Allowance for loan losses, end of period		8
Retail Portfolio Segment [Member] | Overdrafts [Member] | Impact of adopting ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	3
Allowance for loan losses, end of period		3
Retail Portfolio Segment [Member] | Other Consumer [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Provision for (credit to) loan losses	13
Charge-offs	(14)
Recoveries	2
Allowance for loan losses, end of period	34
Retail Portfolio Segment [Member] | Other Consumer [Member] | Prior to adoption of ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	41
Allowance for loan losses, end of period		41
Retail Portfolio Segment [Member] | Other Consumer [Member] | Impact of adopting ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	(8)
Allowance for loan losses, end of period		(8)
Retail Portfolio Segment [Member] | Home Equity Loans and Lines [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	437	376	386
Provision for (credit to) loan losses		55	32
Charge-offs		0	(49)
Recoveries		6	7
Allowance for loan losses, end of period		437	376
Unallocated Financing Receivables [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	502	505	550
Provision for (credit to) loan losses	0	(3)	45
Charge-offs		0	0
Recoveries		0	0
Allowance for loan losses, end of period	0	502	$ 505
Unallocated Financing Receivables [Member] | Prior to adoption of ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	502
Allowance for loan losses, end of period		502
Unallocated Financing Receivables [Member] | Impact of adopting ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	$ (502)
Allowance for loan losses, end of period		$ (502)