Note 3 - Loans and Allowance for Credit Losses on Loans - Allowance for Loan Losses (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Beginning balance	$ 82,155,000	$ 77,710,000	$ 79,374,000	$ 73,531,000	$ 73,531,000
Loans, individually evaluated for impairment	25,750,000		25,750,000		30,842,000
Provision for credit losses	4,325,000	2,300,000	6,575,000	6,700,000
Charge-offs	(1,345,000)	(2,115,000)	(1,954,000)	(2,805,000)	(7,512,000)
Recoveries	208,000	180,000	1,348,000	649,000
Ending balance	85,343,000	78,075,000	85,343,000	78,075,000	79,374,000
Allowance for loans, individually evaluated for impairment	3,534,000		3,534,000		3,833,000
Real Estate [Member]
Loans, individually evaluated for impairment	20,407,000		20,407,000		26,318,000
Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment	5,015,000		5,015,000		4,189,000
Other Collateral [Member]
Loans, individually evaluated for impairment	328,000		328,000		335,000
Commercial Real Estate Portfolio Segment [Member]
Beginning balance	22,751,000	33,330,000	33,800,000	33,468,000	33,468,000
Loans, individually evaluated for impairment	9,662,000		9,662,000		18,005,000
Provision for credit losses	(74,000)	668,000	(11,205,000)	494,000
Charge-offs	0	0	0	0
Recoveries	18,000	23,000	100,000	59,000
Ending balance	22,695,000	34,021,000	22,695,000	34,021,000	33,800,000
Allowance for loans, individually evaluated for impairment	1,315,000		1,315,000		2,416,000
Commercial Real Estate Portfolio Segment [Member] | Real Estate [Member]
Loans, individually evaluated for impairment	9,662,000		9,662,000		18,005,000
Commercial Real Estate Portfolio Segment [Member] | Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment	0		0		0
Commercial Real Estate Portfolio Segment [Member] | Other Collateral [Member]
Loans, individually evaluated for impairment	0		0		0
Commercial and Industrial Portfolio Segment [Member]
Beginning balance	27,454,000	21,295,000	20,854,000	19,380,000	19,380,000
Loans, individually evaluated for impairment	8,591,000		8,591,000		7,272,000
Provision for credit losses	878,000	868,000	6,809,000	2,762,000
Charge-offs	(658,000)	(1,878,000)	(748,000)	(2,006,000)
Recoveries	67,000	17,000	826,000	166,000
Ending balance	27,741,000	20,302,000	27,741,000	20,302,000	20,854,000
Allowance for loans, individually evaluated for impairment	1,415,000		1,415,000		1,085,000
Commercial and Industrial Portfolio Segment [Member] | Real Estate [Member]
Loans, individually evaluated for impairment	3,576,000		3,576,000		3,083,000
Commercial and Industrial Portfolio Segment [Member] | Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment	5,015,000		5,015,000		4,189,000
Commercial and Industrial Portfolio Segment [Member] | Other Collateral [Member]
Loans, individually evaluated for impairment	0		0		0
Residential Real Estate Portfolio Segment [Member]
Beginning balance	17,573,000	13,004,000	13,598,000	10,314,000	10,314,000
Loans, individually evaluated for impairment	7,079,000		7,079,000		4,763,000
Provision for credit losses	1,696,000	333,000	5,672,000	3,043,000
Charge-offs	(395,000)	0	(416,000)	(43,000)
Recoveries	11,000	6,000	31,000	29,000
Ending balance	18,885,000	13,343,000	18,885,000	13,343,000	13,598,000
Allowance for loans, individually evaluated for impairment	794,000		794,000		314,000
Residential Real Estate Portfolio Segment [Member] | Real Estate [Member]
Loans, individually evaluated for impairment	7,079,000		7,079,000		4,763,000
Residential Real Estate Portfolio Segment [Member] | Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment	0		0		0
Residential Real Estate Portfolio Segment [Member] | Other Collateral [Member]
Loans, individually evaluated for impairment	0		0		0
Construction and Development [Member]
Beginning balance	10,029,000	6,752,000	7,593,000	7,186,000	7,186,000
Loans, individually evaluated for impairment	0		0		0
Provision for credit losses	1,622,000	227,000	4,058,000	(207,000)
Charge-offs	0	0	0	0	0
Recoveries	0	0	0	0
Ending balance	11,651,000	6,979,000	11,651,000	6,979,000	7,593,000
Allowance for loans, individually evaluated for impairment	0		0		0
Construction and Development [Member] | Real Estate [Member]
Loans, individually evaluated for impairment	0		0		0
Construction and Development [Member] | Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment	0		0		0
Construction and Development [Member] | Other Collateral [Member]
Loans, individually evaluated for impairment	0		0		0
Consumer Portfolio Segment [Member]
Beginning balance	2,552,000	1,285,000	1,407,000	1,158,000	1,158,000
Loans, individually evaluated for impairment	328,000		328,000		335,000
Provision for credit losses	(6,000)	184,000	1,294,000	473,000
Charge-offs	(193,000)	(232,000)	(606,000)	(639,000)	(865,000)
Recoveries	107,000	131,000	365,000	376,000
Ending balance	2,460,000	1,368,000	2,460,000	1,368,000	1,407,000
Allowance for loans, individually evaluated for impairment	10,000		10,000		18,000
Consumer Portfolio Segment [Member] | Real Estate [Member]
Loans, individually evaluated for impairment	0		0		0
Consumer Portfolio Segment [Member] | Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment	0		0		0
Consumer Portfolio Segment [Member] | Other Collateral [Member]
Loans, individually evaluated for impairment	328,000		328,000		335,000
Finance Leases Portfolio Segment [Member]
Beginning balance	411,000	205,000	220,000	201,000	201,000
Loans, individually evaluated for impairment	0		0		0
Provision for credit losses	(9,000)	7,000	182,000	11,000
Charge-offs	0	0	0	0	0
Recoveries	0	0	0	0
Ending balance	402,000	212,000	402,000	212,000	220,000
Allowance for loans, individually evaluated for impairment	0		0		0
Finance Leases Portfolio Segment [Member] | Real Estate [Member]
Loans, individually evaluated for impairment	0		0		0
Finance Leases Portfolio Segment [Member] | Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment	0		0		0
Finance Leases Portfolio Segment [Member] | Other Collateral [Member]
Loans, individually evaluated for impairment	0		0		0
Non-owner Occupied [Member] | Commercial Real Estate Portfolio Segment [Member]
Beginning balance	13,032,000	21,773,000	22,133,000	22,641,000	22,641,000
Loans, individually evaluated for impairment	7,607,000		7,607,000		15,419,000
Provision for credit losses	278,000	(420,000)	(8,856,000)	(1,324,000)
Charge-offs	0	0	0	0	0
Recoveries	18,000	17,000	51,000	53,000
Ending balance	13,328,000	21,370,000	13,328,000	21,370,000	22,133,000
Allowance for loans, individually evaluated for impairment	1,007,000		1,007,000		1,604,000
Non-owner Occupied [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate [Member]
Loans, individually evaluated for impairment	7,607,000		7,607,000		15,419,000
Non-owner Occupied [Member] | Commercial Real Estate Portfolio Segment [Member] | Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment	0		0		0
Non-owner Occupied [Member] | Commercial Real Estate Portfolio Segment [Member] | Other Collateral [Member]
Loans, individually evaluated for impairment	0		0		0
Non-owner Occupied [Member] | Residential Real Estate Portfolio Segment [Member]
Beginning balance	4,248,000	4,169,000	4,282,000	3,597,000	3,597,000
Loans, individually evaluated for impairment	1,082,000		1,082,000		558,000
Provision for credit losses	685,000	55,000	651,000	625,000
Charge-offs	0	0	0	0	0
Recoveries	7,000	0	7,000	2,000
Ending balance	4,940,000	4,224,000	4,940,000	4,224,000	4,282,000
Allowance for loans, individually evaluated for impairment	596,000		596,000		116,000
Non-owner Occupied [Member] | Residential Real Estate Portfolio Segment [Member] | Real Estate [Member]
Loans, individually evaluated for impairment	1,082,000		1,082,000		558,000
Non-owner Occupied [Member] | Residential Real Estate Portfolio Segment [Member] | Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment	0		0		0
Non-owner Occupied [Member] | Residential Real Estate Portfolio Segment [Member] | Other Collateral [Member]
Loans, individually evaluated for impairment	0		0		0
Owner Occupied [Member] | Commercial Real Estate Portfolio Segment [Member]
Beginning balance	9,719,000	11,557,000	11,667,000	10,827,000	10,827,000
Loans, individually evaluated for impairment	2,055,000		2,055,000		2,586,000
Provision for credit losses	(352,000)	1,088,000	(2,349,000)	1,818,000
Charge-offs	0	0	0	0	0
Recoveries	0	6,000	49,000	6,000
Ending balance	9,367,000	12,651,000	9,367,000	12,651,000	11,667,000
Allowance for loans, individually evaluated for impairment	308,000		308,000		812,000
Owner Occupied [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate [Member]
Loans, individually evaluated for impairment	2,055,000		2,055,000		2,586,000
Owner Occupied [Member] | Commercial Real Estate Portfolio Segment [Member] | Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment	0		0		0
Owner Occupied [Member] | Commercial Real Estate Portfolio Segment [Member] | Other Collateral [Member]
Loans, individually evaluated for impairment	0		0		0
Owner Occupied [Member] | Residential Real Estate Portfolio Segment [Member]
Beginning balance	13,325,000	8,835,000	9,316,000	6,717,000	6,717,000
Loans, individually evaluated for impairment	5,997,000		5,997,000		4,205,000
Provision for credit losses	1,011,000	278,000	5,021,000	2,418,000
Charge-offs	(395,000)	0	(416,000)	(43,000)	(43,000)
Recoveries	4,000	6,000	24,000	27,000
Ending balance	13,945,000	9,119,000	13,945,000	9,119,000	9,316,000
Allowance for loans, individually evaluated for impairment	198,000		198,000		198,000
Owner Occupied [Member] | Residential Real Estate Portfolio Segment [Member] | Real Estate [Member]
Loans, individually evaluated for impairment	5,997,000		5,997,000		4,205,000
Owner Occupied [Member] | Residential Real Estate Portfolio Segment [Member] | Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment	0		0		0
Owner Occupied [Member] | Residential Real Estate Portfolio Segment [Member] | Other Collateral [Member]
Loans, individually evaluated for impairment	0		0		0
Term [Member] | Commercial and Industrial Portfolio Segment [Member]
Beginning balance	21,629,000	14,792,000	14,359,000	12,991,000	12,991,000
Loans, individually evaluated for impairment	6,240,000		6,240,000		4,390,000
Provision for credit losses	201,000	1,026,000	7,006,000	2,955,000
Charge-offs	(658,000)	(1,878,000)	(748,000)	(2,006,000)	(2,298,000)
Recoveries	67,000	16,000	622,000	16,000
Ending balance	21,239,000	13,956,000	21,239,000	13,956,000	14,359,000
Allowance for loans, individually evaluated for impairment	810,000		810,000		377,000
Term [Member] | Commercial and Industrial Portfolio Segment [Member] | Real Estate [Member]
Loans, individually evaluated for impairment	1,425,000		1,425,000		302,000
Term [Member] | Commercial and Industrial Portfolio Segment [Member] | Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment	4,815,000		4,815,000		4,088,000
Term [Member] | Commercial and Industrial Portfolio Segment [Member] | Other Collateral [Member]
Loans, individually evaluated for impairment	0		0		0
Lines of Credit [Member] | Commercial and Industrial Portfolio Segment [Member]
Beginning balance	5,825,000	6,503,000	6,495,000	6,389,000	6,389,000
Loans, individually evaluated for impairment	2,351,000		2,351,000		2,882,000
Provision for credit losses	677,000	(158,000)	(197,000)	(193,000)
Charge-offs	0	0	0	0	(3,633,000)
Recoveries	0	1,000	204,000	150,000
Ending balance	6,502,000	6,346,000	6,502,000	6,346,000	6,495,000
Allowance for loans, individually evaluated for impairment	605,000		605,000		708,000
Lines of Credit [Member] | Commercial and Industrial Portfolio Segment [Member] | Real Estate [Member]
Loans, individually evaluated for impairment	2,151,000		2,151,000		2,781,000
Lines of Credit [Member] | Commercial and Industrial Portfolio Segment [Member] | Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment	200,000		200,000		101,000
Lines of Credit [Member] | Commercial and Industrial Portfolio Segment [Member] | Other Collateral [Member]
Loans, individually evaluated for impairment	0		0		0
Home Equity Line of Credit [Member]
Beginning balance	1,147,000	1,609,000	1,660,000	1,613,000	1,613,000
Loans, individually evaluated for impairment	90,000		90,000		467,000
Provision for credit losses	87,000	(7,000)	(428,000)	1,000
Charge-offs	0	0	0	(12,000)
Recoveries	0	0	2,000	0
Ending balance	1,234,000	1,602,000	1,234,000	1,602,000	1,660,000
Allowance for loans, individually evaluated for impairment	0		0		0
Home Equity Line of Credit [Member] | Real Estate [Member]
Loans, individually evaluated for impairment	90,000		90,000		467,000
Home Equity Line of Credit [Member] | Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment	0		0		0
Home Equity Line of Credit [Member] | Other Collateral [Member]
Loans, individually evaluated for impairment	0		0		0
Credit Card Receivable [Member] | Commercial Portfolio Segment [Member]
Beginning balance	238,000	230,000	242,000	211,000	211,000
Loans, individually evaluated for impairment	0		0		0
Provision for credit losses	131,000	20,000	193,000	123,000
Charge-offs	(99,000)	(5,000)	(184,000)	(105,000)	(661,000)
Recoveries	5,000	3,000	24,000	19,000
Ending balance	275,000	$ 248,000	275,000	$ 248,000	242,000
Allowance for loans, individually evaluated for impairment	0		0		0
Credit Card Receivable [Member] | Commercial Portfolio Segment [Member] | Real Estate [Member]
Loans, individually evaluated for impairment	0		0		0
Credit Card Receivable [Member] | Commercial Portfolio Segment [Member] | Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment	0		0		0
Credit Card Receivable [Member] | Commercial Portfolio Segment [Member] | Other Collateral [Member]
Loans, individually evaluated for impairment	$ 0		$ 0		$ 0