Note 8 - Allowance for Loan Losses (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	$ 9,215	$ 8,744	$ 8,744
Provision for (credit to) loan losses	303	551
Charge-offs	(20)	(24)
Recoveries	33	27
Allowance for loan losses, end of period	9,531	9,298	9,215
Commercial And Industrial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Charge-offs	0		0
Overdrafts [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Charge-offs	(16)		(92)
Other Consumer [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Charge-offs			(18)
Commercial Portfolio Segment [Member] \| Commercial And Industrial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	744	829	829
Provision for (credit to) loan losses	23	(29)
Charge-offs	0	0
Recoveries	8	10
Allowance for loan losses, end of period	775	810	744
Commercial Portfolio Segment [Member] \| Construction and Land Development [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	2,165	1,336	1,336
Provision for (credit to) loan losses	306	(237)
Charge-offs	0	0
Recoveries	0	0
Allowance for loan losses, end of period	2,471	1,099	2,165
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	2,344	2,012	2,012
Provision for (credit to) loan losses	(75)	(35)
Charge-offs	0	0
Recoveries	0	0
Allowance for loan losses, end of period	2,269	1,977	2,344
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	716	853	853
Provision for (credit to) loan losses	(19)	(8)
Charge-offs	0	0
Recoveries	0	0
Allowance for loan losses, end of period	697	845	716
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	1,042	1,142	1,142
Provision for (credit to) loan losses	(1)	886
Charge-offs	0	0
Recoveries	0	0
Allowance for loan losses, end of period	1,041	2,028	1,042
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	29	24	24
Provision for (credit to) loan losses	1	(2)
Charge-offs	0	0
Recoveries	0	0
Allowance for loan losses, end of period	30	22	29
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	1,252	1,238	1,238
Provision for (credit to) loan losses	43	230
Charge-offs	0	0
Recoveries	2	3
Allowance for loan losses, end of period	1,297	1,471	1,252
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	140	339	339
Provision for (credit to) loan losses	10	(330)
Charge-offs	0	0
Recoveries	0	0
Allowance for loan losses, end of period	150	9	140
State and Political Subdivisions Portfolio Segment [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	25	34	34
Provision for (credit to) loan losses	(2)	2
Charge-offs	0	0
Recoveries	0	0
Allowance for loan losses, end of period	23	36	25
Retail Portfolio Segment [Member] \| Family Residential Mortgages [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	248	323	323
Provision for (credit to) loan losses	60	(3)
Charge-offs	0	0
Recoveries	0	0
Allowance for loan losses, end of period	308	320	248
Retail Portfolio Segment [Member] \| Construction - Individual [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	3	0	0
Provision for (credit to) loan losses	(1)	0
Charge-offs	0	0
Recoveries	0	0
Allowance for loan losses, end of period	2	0	3
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	143	143
Provision for (credit to) loan losses	(13)	(3)
Charge-offs	0	0
Recoveries	0	0
Allowance for loan losses, end of period	125	140	138
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	28	31	31
Provision for (credit to) loan losses	(1)	1
Charge-offs	0	0
Recoveries	0	0
Allowance for loan losses, end of period	27	32	28
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	58	77	77
Provision for (credit to) loan losses	1	2
Charge-offs	(4)	0
Recoveries	1	0
Allowance for loan losses, end of period	56	79	58
Retail Portfolio Segment [Member] \| Student Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	226	310	310
Provision for (credit to) loan losses	(36)	(40)
Charge-offs	0	0
Recoveries	15	8
Allowance for loan losses, end of period	205	278	226
Retail Portfolio Segment [Member] \| Overdrafts [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	21	18	18
Provision for (credit to) loan losses	8	19
Charge-offs	(16)	(13)
Recoveries	7	6
Allowance for loan losses, end of period	20	30	21
Retail Portfolio Segment [Member] \| Other Consumer [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	36	35	35
Provision for (credit to) loan losses	(1)	98
Charge-offs	0	(11)
Recoveries	0	0
Allowance for loan losses, end of period	$ 35	$ 122	$ 36