Note 5 - Allowance for Credit Losses on Loans (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	$ 8,852	$ 10,531	$ 11,184
Provision for (credit to) loan losses	(49)	(828)	(850)
Charge-offs	(199)	(475)	(196)
Recoveries	140	713	393
Allowance for loan losses, end of period	8,744	8,852	10,531
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
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)
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	(52)	(57)
Overdrafts [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Charge-offs	(101)	(91)
Other Consumer [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Charge-offs	(23)	(14)
Commercial Portfolio Segment [Member] | Commercial And Industrial [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	823	1,316	3,368
Provision for (credit to) loan losses	(23)	(771)	(2,320)
Charge-offs	(23)	(313)	(38)
Recoveries	52	661	306
Allowance for loan losses, end of period	829	823	1,316
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]
Allowance for loan losses, beginning of period	1,252
Provision for (credit to) loan losses	84	507
Charge-offs	0	0
Recoveries	0	0
Allowance for loan losses, end of period	1,336	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
Provision for (credit to) loan losses			392
Charge-offs			0
Recoveries			0
Allowance for loan losses, end of period			755
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	277	56
Charge-offs	0	0
Recoveries	0	0
Allowance for loan losses, end of period	2,012	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]
Allowance for loan losses, beginning of period	1,001
Provision for (credit to) loan losses	(148)	(174)
Charge-offs	0	0
Recoveries	0	0
Allowance for loan losses, end of period	853	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]
Allowance for loan losses, beginning of period	1,167
Provision for (credit to) loan losses	(25)	(163)
Charge-offs	0	0
Recoveries	0	0
Allowance for loan losses, end of period	1,142	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]
Allowance for loan losses, beginning of period	27
Provision for (credit to) loan losses	(3)	(5)
Charge-offs	0	0
Recoveries	0	0
Allowance for loan losses, end of period	24	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]
Allowance for loan losses, beginning of period	1,507
Provision for (credit to) loan losses	(279)	(203)
Charge-offs	0	0
Recoveries	10	10
Allowance for loan losses, end of period	1,238	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]
Allowance for loan losses, beginning of period	14
Provision for (credit to) loan losses	325	(2)
Charge-offs	0	0
Recoveries	0	0
Allowance for loan losses, end of period	339	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
Provision for (credit to) loan losses			722
Charge-offs			0
Recoveries			0
Allowance for loan losses, end of period			5,002
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
Provision for (credit to) loan losses			160
Charge-offs			0
Recoveries			45
Allowance for loan losses, end of period			1,240
State and Political Subdivisions Portfolio Segment [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	55	94	69
Provision for (credit to) loan losses	(21)	(19)	25
Charge-offs	0	0	0
Recoveries	0	0	0
Allowance for loan losses, end of period	34	55	94
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] | Consumer Loans [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period		502	542
Provision for (credit to) loan losses			82
Charge-offs			(158)
Recoveries			36
Allowance for loan losses, end of period			502
Retail Portfolio Segment [Member] | Family Residential Mortgages [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	427	683	646
Provision for (credit to) loan losses	(108)	(59)	37
Charge-offs	0	0	0
Recoveries	4	0	0
Allowance for loan losses, end of period	323	427	683
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]
Allowance for loan losses, beginning of period	0
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		0
Allowance for loan losses, end 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	5	(154)
Charge-offs	0	0
Recoveries	0	0
Allowance for loan losses, end of period	143	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
Allowance for loan losses, end 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)
Allowance for loan losses, end 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	(151)	110
Charge-offs	0	0
Recoveries	0	0
Allowance for loan losses, end of period	31	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
Allowance for loan losses, end 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
Allowance for loan losses, end 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	(28)	15
Charge-offs	0	0
Recoveries	0	6
Allowance for loan losses, end of period	77	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
Allowance for loan losses, end 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
Allowance for loan losses, end 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	(37)	(48)
Charge-offs	(52)	(57)
Recoveries	30	8
Allowance for loan losses, end of period	310	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]
Allowance for loan losses, beginning of period	16
Provision for (credit to) loan losses	69	70
Charge-offs	(101)	(91)
Recoveries	34	26
Allowance for loan losses, end of period	18	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]
Allowance for loan losses, beginning of period	34
Provision for (credit to) loan losses	14	13
Charge-offs	(23)	(14)
Recoveries	10	2
Allowance for loan losses, end of period	35	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
Provision for (credit to) loan losses			55
Charge-offs			0
Recoveries			6
Allowance for loan losses, end of period			437
Unallocated Financing Receivables [Member]
Financing Receivable Allowance For Credit Losses [Line Items]
Allowance for loan losses, beginning of period	$ 0	502	505
Provision for (credit to) loan losses		0	(3)
Charge-offs			0
Recoveries			0
Allowance for loan losses, end of period		0	502
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)