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Note 3 - Loans and Allowance for Credit Losses on Loans - Allowance for Loan Losses (Details) - USD ($)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Commercial real estate - non-owner occupied	$ 80,897,000	$ 75,673,000	$ 79,374,000	$ 73,531,000	$ 73,531,000
Loans, individually evaluated for impairment	27,740,000		27,740,000		30,842,000
Commercial real estate - non-owner occupied	1,075,000	2,150,000	2,250,000	4,400,000
Commercial real estate - non-owner occupied	(347,000)	(320,000)	(609,000)	(690,000)	(7,512,000)
Commercial real estate - non-owner occupied	530,000	207,000	1,140,000	469,000
Commercial real estate - non-owner occupied	82,155,000	77,710,000	82,155,000	77,710,000	79,374,000
Allowance for loans, individually evaluated for impairment	4,118,000		4,118,000		3,833,000
Real Estate [Member]
Loans, individually evaluated for impairment	21,386,000		21,386,000		26,318,000
Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment	5,793,000		5,793,000		4,189,000
Other Collateral [Member]
Loans, individually evaluated for impairment	561,000		561,000		335,000
Commercial Real Estate Portfolio Segment [Member]
Commercial real estate - non-owner occupied	33,053,000	33,098,000	33,800,000	33,468,000	33,468,000
Loans, individually evaluated for impairment	11,572,000		11,572,000		18,005,000
Commercial real estate - non-owner occupied	(10,364,000)	215,000	(11,131,000)	(174,000)
Commercial real estate - non-owner occupied	0	0	0	0
Commercial real estate - non-owner occupied	62,000	17,000	82,000	36,000
Commercial real estate - non-owner occupied	22,751,000	33,330,000	22,751,000	33,330,000	33,800,000
Allowance for loans, individually evaluated for impairment	1,876,000		1,876,000		2,416,000
Commercial Real Estate Portfolio Segment [Member] | Real Estate [Member]
Loans, individually evaluated for impairment	11,572,000		11,572,000		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]
Commercial real estate - non-owner occupied	20,174,000	20,023,000	20,854,000	19,380,000	19,380,000
Loans, individually evaluated for impairment	9,215,000		9,215,000		7,272,000
Commercial real estate - non-owner occupied	7,045,000	1,267,000	5,931,000	1,894,000
Commercial real estate - non-owner occupied	(67,000)	(57,000)	(90,000)	(128,000)
Commercial real estate - non-owner occupied	302,000	62,000	759,000	149,000
Commercial real estate - non-owner occupied	27,454,000	21,295,000	27,454,000	21,295,000	20,854,000
Allowance for loans, individually evaluated for impairment	1,860,000		1,860,000		1,085,000
Commercial and Industrial Portfolio Segment [Member] | Real Estate [Member]
Loans, individually evaluated for impairment	3,231,000		3,231,000		3,083,000
Commercial and Industrial Portfolio Segment [Member] | Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment	5,793,000		5,793,000		4,189,000
Commercial and Industrial Portfolio Segment [Member] | Other Collateral [Member]
Loans, individually evaluated for impairment	191,000		191,000		0
Residential Real Estate Portfolio Segment [Member]
Commercial real estate - non-owner occupied	16,557,000	12,349,000	13,598,000	10,314,000	10,314,000
Loans, individually evaluated for impairment	6,019,000		6,019,000		4,763,000
Commercial real estate - non-owner occupied	1,018,000	686,000	3,976,000	2,710,000
Commercial real estate - non-owner occupied	(7,000)	(43,000)	(21,000)	(43,000)
Commercial real estate - non-owner occupied	5,000	12,000	20,000	23,000
Commercial real estate - non-owner occupied	17,573,000	13,004,000	17,573,000	13,004,000	13,598,000
Allowance for loans, individually evaluated for impairment	370,000		370,000		314,000
Residential Real Estate Portfolio Segment [Member] | Real Estate [Member]
Loans, individually evaluated for impairment	6,019,000		6,019,000		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]
Commercial real estate - non-owner occupied	7,459,000	6,735,000	7,593,000	7,186,000	7,186,000
Loans, individually evaluated for impairment	0		0		0
Commercial real estate - non-owner occupied	2,570,000	17,000	2,436,000	(434,000)
Commercial real estate - non-owner occupied	0	0	0	0	0
Commercial real estate - non-owner occupied	0	0	0	0
Commercial real estate - non-owner occupied	10,029,000	6,752,000	10,029,000	6,752,000	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]
Commercial real estate - non-owner occupied	1,500,000	1,186,000	1,407,000	1,158,000	1,158,000
Loans, individually evaluated for impairment	370,000		370,000		335,000
Commercial real estate - non-owner occupied	1,108,000	201,000	1,300,000	289,000
Commercial real estate - non-owner occupied	(203,000)	(208,000)	(413,000)	(407,000)	(865,000)
Commercial real estate - non-owner occupied	147,000	106,000	258,000	245,000
Commercial real estate - non-owner occupied	2,552,000	1,285,000	2,552,000	1,285,000	1,407,000
Allowance for loans, individually evaluated for impairment	12,000		12,000		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	370,000		370,000		335,000
Finance Leases Portfolio Segment [Member]
Commercial real estate - non-owner occupied	232,000	199,000	220,000	201,000	201,000
Loans, individually evaluated for impairment	0		0		0
Commercial real estate - non-owner occupied	179,000	6,000	191,000	4,000
Commercial real estate - non-owner occupied	0	0	0	0	0
Commercial real estate - non-owner occupied	0	0	0	0
Commercial real estate - non-owner occupied	411,000	205,000	411,000	205,000	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]
Commercial real estate - non-owner occupied	21,823,000	21,669,000	22,133,000	22,641,000	22,641,000
Loans, individually evaluated for impairment	8,199,000		8,199,000		2,586,000
Commercial real estate - non-owner occupied	(8,808,000)	87,000	(9,134,000)	(904,000)
Commercial real estate - non-owner occupied	0	0	0	0	0
Commercial real estate - non-owner occupied	17,000	17,000	33,000	36,000
Commercial real estate - non-owner occupied	13,032,000	21,773,000	13,032,000	21,773,000	22,133,000
Allowance for loans, individually evaluated for impairment	1,066,000		1,066,000		812,000
Non-owner Occupied [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate [Member]
Loans, individually evaluated for impairment	8,199,000		8,199,000		2,586,000
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]
Commercial real estate - non-owner occupied	4,731,000	4,144,000	4,282,000	3,597,000	3,597,000
Loans, individually evaluated for impairment	545,000		545,000		558,000
Commercial real estate - non-owner occupied	(483,000)	24,000	(34,000)	570,000
Commercial real estate - non-owner occupied	0	0	0	0	0
Commercial real estate - non-owner occupied	0	1,000	0	2,000
Commercial real estate - non-owner occupied	4,248,000	4,169,000	4,248,000	4,169,000	4,282,000
Allowance for loans, individually evaluated for impairment	116,000		116,000		116,000
Non-owner Occupied [Member] | Residential Real Estate Portfolio Segment [Member] | Real Estate [Member]
Loans, individually evaluated for impairment	545,000		545,000		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]
Commercial real estate - non-owner occupied	11,230,000	11,429,000	11,667,000	10,827,000	10,827,000
Loans, individually evaluated for impairment	3,373,000		3,373,000		15,419,000
Commercial real estate - non-owner occupied	(1,556,000)	128,000	(1,997,000)	730,000
Commercial real estate - non-owner occupied	0	0	0	0	0
Commercial real estate - non-owner occupied	45,000	0	49,000	0
Commercial real estate - non-owner occupied	9,719,000	11,557,000	9,719,000	11,557,000	11,667,000
Allowance for loans, individually evaluated for impairment	810,000		810,000		1,604,000
Owner Occupied [Member] | Commercial Real Estate Portfolio Segment [Member] | Real Estate [Member]
Loans, individually evaluated for impairment	3,373,000		3,373,000		15,419,000
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]
Commercial real estate - non-owner occupied	11,826,000	8,205,000	9,316,000	6,717,000	6,717,000
Loans, individually evaluated for impairment	5,474,000		5,474,000		4,205,000
Commercial real estate - non-owner occupied	1,501,000	662,000	4,010,000	2,140,000
Commercial real estate - non-owner occupied	(7,000)	(43,000)	(21,000)	(43,000)	(43,000)
Commercial real estate - non-owner occupied	5,000	11,000	20,000	21,000
Commercial real estate - non-owner occupied	13,325,000	8,835,000	13,325,000	8,835,000	9,316,000
Allowance for loans, individually evaluated for impairment	254,000		254,000		198,000
Owner Occupied [Member] | Residential Real Estate Portfolio Segment [Member] | Real Estate [Member]
Loans, individually evaluated for impairment	5,474,000		5,474,000		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]
Commercial real estate - non-owner occupied	13,916,000	13,998,000	14,359,000	12,991,000	12,991,000
Loans, individually evaluated for impairment	6,932,000		6,932,000		4,390,000
Commercial real estate - non-owner occupied	7,478,000	851,000	6,805,000	1,929,000
Commercial real estate - non-owner occupied	(67,000)	(57,000)	(90,000)	(128,000)	(2,298,000)
Commercial real estate - non-owner occupied	302,000	0	555,000	0
Commercial real estate - non-owner occupied	21,629,000	14,792,000	21,629,000	14,792,000	14,359,000
Allowance for loans, individually evaluated for impairment	1,248,000		1,248,000		377,000
Term [Member] | Commercial and Industrial Portfolio Segment [Member] | Real Estate [Member]
Loans, individually evaluated for impairment	1,049,000		1,049,000		302,000
Term [Member] | Commercial and Industrial Portfolio Segment [Member] | Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment	5,692,000		5,692,000		4,088,000
Term [Member] | Commercial and Industrial Portfolio Segment [Member] | Other Collateral [Member]
Loans, individually evaluated for impairment	191,000		191,000		0
Lines of Credit [Member] | Commercial and Industrial Portfolio Segment [Member]
Commercial real estate - non-owner occupied	6,258,000	6,025,000	6,495,000	6,389,000	6,389,000
Loans, individually evaluated for impairment	2,283,000		2,283,000		2,882,000
Commercial real estate - non-owner occupied	(433,000)	416,000	(874,000)	(35,000)
Commercial real estate - non-owner occupied	0	0	0	0	(3,633,000)
Commercial real estate - non-owner occupied	0	62,000	204,000	149,000
Commercial real estate - non-owner occupied	5,825,000	6,503,000	5,825,000	6,503,000	6,495,000
Allowance for loans, individually evaluated for impairment	612,000		612,000		708,000
Lines of Credit [Member] | Commercial and Industrial Portfolio Segment [Member] | Real Estate [Member]
Loans, individually evaluated for impairment	2,182,000		2,182,000		2,781,000
Lines of Credit [Member] | Commercial and Industrial Portfolio Segment [Member] | Accounts Receivable and Equipment [Member]
Loans, individually evaluated for impairment	101,000		101,000		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]
Commercial real estate - non-owner occupied	1,666,000	1,618,000	1,660,000	1,613,000	1,613,000
Loans, individually evaluated for impairment	564,000		564,000		467,000
Commercial real estate - non-owner occupied	(519,000)	(9,000)	(515,000)	8,000
Commercial real estate - non-owner occupied	0	0	0	(12,000)
Commercial real estate - non-owner occupied	0	0	2,000	0
Commercial real estate - non-owner occupied	1,147,000	1,609,000	1,147,000	1,609,000	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	564,000		564,000		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]
Commercial real estate - non-owner occupied	256,000	465,000	242,000	211,000	211,000
Loans, individually evaluated for impairment	0		0		0
Commercial real estate - non-owner occupied	38,000	(233,000)	62,000	103,000
Commercial real estate - non-owner occupied	(70,000)	(12,000)	(85,000)	(100,000)	(661,000)
Commercial real estate - non-owner occupied	14,000	10,000	19,000	16,000
Commercial real estate - non-owner occupied	238,000	$ 230,000	238,000	$ 230,000	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

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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