Note 8 - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	$ 8,852
Provision for (credit to) loan losses	(93)	$ (1,783)
Charge-offs	(47)	(78)
Recoveries	26	610
Allowance for loan losses, end of period	8,738	8,191
Prior to adoption of ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period		10,531
Impact of adopting ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period		(1,089)
Commercial Portfolio Segment [Member] | Commercial And Industrial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	823
Provision for (credit to) loan losses	119	(940)
Charge-offs	0	0
Recoveries	12	593
Allowance for loan losses, end of period	954	899
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
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)
Commercial Portfolio Segment [Member] | Construction and Land Development [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	1,252
Provision for (credit to) loan losses	22	4
Charge-offs	0	0
Recoveries	0	0
Allowance for loan losses, end of period	1,274	749
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
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)
Commercial Portfolio Segment [Member] | Real Estate Secured by Multi-Family Properties [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	1,735
Provision for (credit to) loan losses	18	(102)
Charge-offs	0	0
Recoveries	0	0
Allowance for loan losses, end of period	1,753	1,577
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
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
Commercial Portfolio Segment [Member] | Real Estate Secured By Owner-Occupied Properties [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	1,001
Provision for (credit to) loan losses	(12)	(203)
Charge-offs	0	0
Recoveries	0	0
Allowance for loan losses, end of period	989	972
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
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)
Commercial Portfolio Segment [Member] | Real Estate Secured by Other Commercial Properties [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	1,167
Provision for (credit to) loan losses	36	(239)
Charge-offs	0	0
Recoveries	0	0
Allowance for loan losses, end of period	1,203	1,091
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
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)
Commercial Portfolio Segment [Member] | Revolving Real Estate Secured By Family Properties-business [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	27
Provision for (credit to) loan losses	4	2
Charge-offs	0	0
Recoveries	0	0
Allowance for loan losses, end of period	31	34
Commercial Portfolio Segment [Member] | Revolving Real Estate Secured By Family Properties-business [Member] | Prior to adoption of ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period		25
Commercial Portfolio Segment [Member] | Revolving Real Estate Secured By Family Properties-business [Member] | Impact of adopting ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period		7
Commercial Portfolio Segment [Member] | Real Estate Secured By 1st Lein On Family Properties-Business [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	1,507
Provision for (credit to) loan losses	(210)	(430)
Charge-offs	0	0
Recoveries	2	3
Allowance for loan losses, end of period	1,299	1,273
Commercial Portfolio Segment [Member] | Real Estate Secured By 1st Lein On Family Properties-Business [Member] | Prior to adoption of ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period		1,210
Commercial Portfolio Segment [Member] | Real Estate Secured By 1st Lein On Family Properties-Business [Member] | Impact of adopting ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning 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]
Allowance for loan losses, beginning of period	14
Provision for (credit to) loan losses	(2)	242
Charge-offs	0	0
Recoveries	0	0
Allowance for loan losses, end of period	12	258
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
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)
State and Political Subdivisions Portfolio Segment [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	55
Provision for (credit to) loan losses	(8)	(19)
Charge-offs	0	0
Recoveries	0	0
Allowance for loan losses, end of period	47	55
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
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)
Retail Portfolio Segment [Member] | Family Residential Mortgages [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	427
Provision for (credit to) loan losses	(34)	(81)
Charge-offs	0	0
Recoveries	0	0
Allowance for loan losses, end of period	393	405
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
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)
Retail Portfolio Segment [Member] | Construction - Individual [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	0
Provision for (credit to) loan losses	0	0
Charge-offs	0	0
Recoveries	0	0
Allowance for loan losses, end of period	0	1
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
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		0
Retail Portfolio Segment [Member] | Revolving Home Equity Secured By 1-4 Family Properties-Personal [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	138
Provision for (credit to) loan losses	27	(43)
Charge-offs	0	0
Recoveries	0	0
Allowance for loan losses, end of period	165	249
Retail Portfolio Segment [Member] | Revolving Home Equity Secured By 1-4 Family Properties-Personal [Member] | Prior to adoption of ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period		299
Retail Portfolio Segment [Member] | Revolving Home Equity Secured By 1-4 Family Properties-Personal [Member] | Impact of adopting ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period		(7)
Retail Portfolio Segment [Member] | Real Estate Secured By 1st Lein on 1-4 Family Properties-Personal [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	182
Provision for (credit to) loan losses	(35)	(8)
Charge-offs	0	0
Recoveries	0	0
Allowance for loan losses, end of period	147	64
Retail Portfolio Segment [Member] | Real Estate Secured By 1st Lein on 1-4 Family Properties-Personal [Member] | Prior to adoption of ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period		57
Retail Portfolio Segment [Member] | Real Estate Secured By 1st Lein on 1-4 Family Properties-Personal [Member] | Impact of adopting ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period		15
Retail Portfolio Segment [Member] | Real Estate Secured By Junior Lein On 1-4 Family Properties-Personal [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	105
Provision for (credit to) loan losses	(32)	(9)
Charge-offs	0	0
Recoveries	0	2
Allowance for loan losses, end of period	73	77
Retail Portfolio Segment [Member] | Real Estate Secured By Junior Lein On 1-4 Family Properties-Personal [Member] | Prior to adoption of ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period		55
Retail Portfolio Segment [Member] | Real Estate Secured By Junior Lein On 1-4 Family Properties-Personal [Member] | Impact of adopting ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period		29
Retail Portfolio Segment [Member] | Student Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	369
Provision for (credit to) loan losses	(17)	(17)
Charge-offs	(6)	(3)
Recoveries	4	2
Allowance for loan losses, end of period	350	448
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
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
Retail Portfolio Segment [Member] | Overdrafts [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	16
Provision for (credit to) loan losses	23	31
Charge-offs	(33)	(43)
Recoveries	8	10
Allowance for loan losses, end of period	14	9
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
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
Retail Portfolio Segment [Member] | Other Consumer [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	34
Provision for (credit to) loan losses	8	29
Charge-offs	(8)	(32)
Recoveries	0	0
Allowance for loan losses, end of period	$ 34	30
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
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)
Unallocated Financing Receivables [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Provision for (credit to) loan losses		0
Allowance for loan losses, end of period		0
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
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)