Note 8 - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	$ 8,738	$ 8,191	$ 8,852
Provision for (credit to) loan losses	132	212	39	$ (1,571)
Charge-offs	(43)	(60)	(90)	(138)
Recoveries	31	22	57	632
Allowance for loan losses, end of period	8,858	8,365	8,858	8,365	$ 8,852
Prior to adoption of ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period				10,531	10,531
Impact of adopting ASC 326
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period				(1,089)	(1,089)
Commercial And Industrial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Charge-offs			(23)		(313)
Student Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Charge-offs			(6)		(57)
Overdrafts [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Charge-offs			(53)		(91)
Other Consumer [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Charge-offs			(8)		(14)
Commercial Portfolio Segment [Member] | Commercial And Industrial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	954	899	823
Provision for (credit to) loan losses	(24)	(75)	95	(1,015)
Charge-offs	(23)	(40)	(23)	(40)
Recoveries	13	11	25	604
Allowance for loan losses, end of period	920	795	920	795	823
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	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)	(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	1,274	749	1,252
Provision for (credit to) loan losses	114	105	136	109
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Allowance for loan losses, end of period	1,388	854	1,388	854	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	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)	(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	1,753	1,577	1,735
Provision for (credit to) loan losses	65	47	83	(55)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Allowance for loan losses, end of period	1,818	1,624	1,818	1,624	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	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	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	989	972	1,001
Provision for (credit to) loan losses	(19)	13	(31)	(190)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Allowance for loan losses, end of period	970	985	970	985	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	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)	(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	1,203	1,091	1,167
Provision for (credit to) loan losses	43	137	79	(102)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Allowance for loan losses, end of period	1,246	1,228	1,246	1,228	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	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)	(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	31	34	27
Provision for (credit to) loan losses	(8)	3	(4)	5
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Allowance for loan losses, end of period	23	37	23	37	27
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	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	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	1,299	1,273	1,507
Provision for (credit to) loan losses	(4)	2	(214)	(428)
Charge-offs	0	0	0	0
Recoveries	3	2	5	5
Allowance for loan losses, end of period	1,298	1,277	1,298	1,277	1,507
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	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	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	12	258	14
Provision for (credit to) loan losses	(1)	(24)	(3)	218
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Allowance for loan losses, end of period	11	234	11	234	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	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)	(14)
State and Political Subdivisions Portfolio Segment [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	47	55	55
Provision for (credit to) loan losses	(3)	(4)	(11)	(23)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Allowance for loan losses, end of period	44	51	44	51	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	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)	(20)
Retail Portfolio Segment [Member] | Family Residential Mortgages [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	393	405	427
Provision for (credit to) loan losses	(13)	28	(47)	(53)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Allowance for loan losses, end of period	380	433	380	433	427
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	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)	(196)
Retail Portfolio Segment [Member] | Construction - Individual [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	0	1	0
Provision for (credit to) loan losses	0	(1)	0	(1)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Allowance for loan losses, end of period	0	0	0	0	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	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	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	165	249	138
Provision for (credit to) loan losses	1	(15)	28	(58)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Allowance for loan losses, end of period	166	234	166	234	138
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	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)	(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	147	64	182
Provision for (credit to) loan losses	(13)	3	(48)	(5)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Allowance for loan losses, end of period	134	67	134	67	182
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	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	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	73	77	105
Provision for (credit to) loan losses	6	7	(26)	(2)
Charge-offs	0	0	0	0
Recoveries	0	2	0	4
Allowance for loan losses, end of period	79	86	79	86	105
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	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	29
Retail Portfolio Segment [Member] | Student Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	350	448	369
Provision for (credit to) loan losses	(18)	(32)	(35)	(9)
Charge-offs	0	0	(6)	(43)
Recoveries	4	2	8	4
Allowance for loan losses, end of period	336	418	336	418	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	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	12
Retail Portfolio Segment [Member] | Overdrafts [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	14	9	16
Provision for (credit to) loan losses	13	19	36	39
Charge-offs	(20)	(20)	(53)	(52)
Recoveries	6	5	14	15
Allowance for loan losses, end of period	13	13	13	13	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	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	3
Retail Portfolio Segment [Member] | Other Consumer [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	34	30	34
Provision for (credit to) loan losses	(7)	(1)	1	(1)
Charge-offs	0	0	(8)	(3)
Recoveries	5	0	5	0
Allowance for loan losses, end of period	$ 32	29	$ 32	29	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	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)	(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		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	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)	$ (502)