Note 8 - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	$ 9,298	$ 8,738	$ 8,744	$ 8,852	$ 8,852
Provision for (credit to) loan losses	(145)	132	406	39
Charge-offs	(32)	(43)	(56)	(90)
Recoveries	48	31	75	57
Allowance for loan losses, end of period	9,169	8,858	9,169	8,858	8,744
Commercial And Industrial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Charge-offs			0		(23)
Student Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Charge-offs					(52)
Overdrafts [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Charge-offs			(44)		(101)
Other Consumer [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Charge-offs			(12)		(23)
Commercial Portfolio Segment [Member] \| Commercial And Industrial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	810	954	829	823	823
Provision for (credit to) loan losses	4	(24)	(25)	95
Charge-offs	0	(23)		(23)
Recoveries	7	13	17	25
Allowance for loan losses, end of period	821	920	821	920	829
Commercial Portfolio Segment [Member] \| Construction and Land Development [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	1,099	1,274	1,336	1,252	1,252
Provision for (credit to) loan losses	36	114	(201)	136
Charge-offs	0	0		0
Recoveries	0	0		0
Allowance for loan losses, end of period	1,135	1,388	1,135	1,388	1,336
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	1,977	1,753	2,012	1,735	1,735
Provision for (credit to) loan losses	(139)	65	(174)	83
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Allowance for loan losses, end of period	1,838	1,818	1,838	1,818	2,012
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	845	989	853	1,001	1,001
Provision for (credit to) loan losses	56	(19)	48	(31)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Allowance for loan losses, end of period	901	970	901	970	853
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	2,028	1,203	1,142	1,167	1,167
Provision for (credit to) loan losses	(67)	43	819	79
Charge-offs	0	0	0	0
Recoveries	30	0	30	0
Allowance for loan losses, end of period	1,991	1,246	1,991	1,246	1,142
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	22	31	24	27	27
Provision for (credit to) loan losses	9	(8)	7	(4)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Allowance for loan losses, end of period	31	23	31	23	24
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	1,471	1,299	1,238	1,507	1,507
Provision for (credit to) loan losses	(107)	(4)	123	(214)
Charge-offs	0	0	0	0
Recoveries	2	3	5	5
Allowance for loan losses, end of period	1,366	1,298	1,366	1,298	1,238
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	9	12	339	14	14
Provision for (credit to) loan losses	7	(1)	(323)	(3)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Allowance for loan losses, end of period	16	11	16	11	339
State and Political Subdivisions Portfolio Segment [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	36	47	34	55	55
Provision for (credit to) loan losses	6	(3)	8	(11)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Allowance for loan losses, end of period	42	44	42	44	34
Retail Portfolio Segment [Member] \| Family Residential Mortgages [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	320	393	323	427	427
Provision for (credit to) loan losses	36	(13)	33	(47)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Allowance for loan losses, end of period	356	380	356	380	323
Retail Portfolio Segment [Member] \| Construction - Individual [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	0	0	0	0	0
Provision for (credit to) loan losses	0	0	0	0
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] \| 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	140	165	143	138	138
Provision for (credit to) loan losses	20	1	17	28
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Allowance for loan losses, end of period	160	166	160	166	143
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	32	147	31	182	182
Provision for (credit to) loan losses	1	(13)	2	(48)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Allowance for loan losses, end of period	33	134	33	134	31
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	79	73	77	105	105
Provision for (credit to) loan losses	1	6	3	(26)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Allowance for loan losses, end of period	80	79	80	79	77
Retail Portfolio Segment [Member] \| Student Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	278	350	310	369	369
Provision for (credit to) loan losses	(26)	(18)	(66)	(35)
Charge-offs	0	0	0	(6)
Recoveries	5	4	13	8
Allowance for loan losses, end of period	257	336	257	336	310
Retail Portfolio Segment [Member] \| Overdrafts [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	30	14	18	16	16
Provision for (credit to) loan losses	18	13	37	36
Charge-offs	(31)	(20)	(44)	(53)
Recoveries	4	6	10	14
Allowance for loan losses, end of period	21	13	21	13	18
Retail Portfolio Segment [Member] \| Other Consumer [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	122	34	35	34	34
Provision for (credit to) loan losses	0	(7)	98	1
Charge-offs	(1)	0	(12)	(8)
Recoveries	0	5	0	5
Allowance for loan losses, end of period	$ 121	$ 32	$ 121	$ 32	$ 35