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Note 4 - Loans, Allowance for Credit Losses and Other Real Estate Owned - Risk Category of Loans by Class (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024	Dec. 31, 2023
Loans	$ 771,030,000		$ 820,300,000
Nonaccrual	0		201,000
Loans, Writeoff	1,726,000	$ 2,003,000
Financial Asset, Not Past Due [Member]
Loans	765,986,000		813,339,000
Financial Asset, 30 to 59 Days Past Due [Member]
Loans	4,148,000		5,314,000
Financial Asset, 60 to 89 Days Past Due [Member]
Loans	619,000		912,000
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	277,000		534,000
Pass [Member]
Loans	749,161,000		789,715,000
Substandard [Member]
Loans	21,460,000		29,867,000
Doubtful [Member]
Loans	99,000		192,000
Unlikely to be Collected Financing Receivable [Member]
Loans	310,000		526,000
Commercial Portfolio Segment [Member]
Originated prior	25,723,000		19,018,000
Originated four years before	9,377,000		8,542,000
Originated three years before	11,323,000		21,374,000
Originated two years before	8,509,000		12,388,000
Originated one years before	18,720,000		14,776,000
Originated current year	15,271,000		19,399,000
Total Term Loans	88,923,000		95,497,000
Financing Receivable Revolving	22,965,000		31,779,000
Loans	111,888,000		127,276,000
Nonaccrual	0		10,000
Originated prior, writeoff	0		59,000
Originated four years before, writeoff	0		0
Originated three years before, writeoff	0		0
Originated two years before, writeoff	0		0
Originated one years before, writeoff	0		0
Originated current year, writeoff	0		0
Financing Receivable, before Allowance for Credit Loss and Revolving Loans, Writeoff	0		59,000
Financing Receivable Revolving, Writeoff	10,000		224,000
Loans, Writeoff	10,000	(0)	283,000
Commercial Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Loans	111,583,000		126,538,000
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans	305,000		700,000
Commercial Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans	0		28,000
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	0		0
Commercial Portfolio Segment [Member] | Pass [Member]
Originated prior	25,468,000		18,752,000
Originated four years before	6,542,000		8,542,000
Originated three years before	11,323,000		18,539,000
Originated two years before	8,509,000		12,388,000
Originated one years before	18,720,000		14,776,000
Originated current year	15,271,000		19,399,000
Total Term Loans	85,833,000		92,396,000
Financing Receivable Revolving	21,797,000		30,562,000
Loans	107,630,000		122,958,000
Commercial Portfolio Segment [Member] | Substandard [Member]
Originated prior	255,000		266,000
Originated four years before	2,835,000		0
Originated three years before	0		2,835,000
Originated two years before	0		0
Originated one years before	0		0
Originated current year	0		0
Total Term Loans	3,090,000		3,101,000
Financing Receivable Revolving	1,168,000		1,217,000
Loans	4,258,000		4,318,000
Commercial Portfolio Segment [Member] | Doubtful [Member]
Originated prior	0		0
Originated four years before	0		0
Originated three years before	0		0
Originated two years before	0		0
Originated one years before	0		0
Originated current year	0		0
Total Term Loans	0		0
Financing Receivable Revolving	0		0
Loans	0		0
Commercial Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member]
Originated prior	0		0
Originated four years before	0		0
Originated three years before	0
Originated two years before	0		0
Originated one years before	0		0
Originated current year	0		0
Total Term Loans	0		0
Financing Receivable Revolving	0		0
Loans	0		0
Commercial Real Estate Portfolio Segment [Member]
Originated prior	264,144,000		214,569,000
Originated four years before	61,266,000		66,353,000
Originated three years before	48,702,000		63,697,000
Originated two years before	42,836,000		49,117,000
Originated one years before	70,650,000		43,091,000
Originated current year	2,014,000		71,073,000
Total Term Loans	489,612,000		507,900,000
Financing Receivable Revolving	0		0
Loans	489,612,000		507,900,000
Nonaccrual	0		191,000
Originated prior, writeoff	191,000			$ 0
Originated four years before, writeoff	0			0
Originated three years before, writeoff	0			0
Originated two years before, writeoff	0			0
Originated one years before, writeoff	0			0
Originated current year, writeoff	0			0
Financing Receivable, before Allowance for Credit Loss and Revolving Loans, Writeoff	191,000			0
Financing Receivable Revolving, Writeoff	0			0
Loans, Writeoff	191,000	(0)		0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Loans	488,508,000		506,588,000
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans	1,104,000		1,121,000
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans	0		0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	0		0
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]
Originated prior	254,005,000		197,160,000
Originated four years before	61,266,000		65,384,000
Originated three years before	48,702,000		63,697,000
Originated two years before	42,836,000		49,117,000
Originated one years before	70,650,000		43,091,000
Originated current year	2,014,000		71,073,000
Total Term Loans	479,473,000		489,522,000
Financing Receivable Revolving	0		0
Loans	479,473,000		489,522,000
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Originated prior	10,139,000		17,409,000
Originated four years before	0		969,000
Originated three years before	0		0
Originated two years before	0		0
Originated one years before	0		0
Originated current year	0		0
Total Term Loans	10,139,000		18,378,000
Financing Receivable Revolving	0		0
Loans	10,139,000		18,378,000
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member]
Originated prior	0		0
Originated four years before	0		0
Originated three years before	0		0
Originated two years before	0		0
Originated one years before	0		0
Originated current year	0		0
Total Term Loans	0		0
Financing Receivable Revolving	0		0
Loans	0		0
Commercial Real Estate Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member]
Originated prior	0		0
Originated four years before	0		0
Originated three years before	0		0
Originated two years before	0		0
Originated one years before	0		0
Originated current year	0		0
Total Term Loans	0		0
Financing Receivable Revolving	0		0
Loans	0		0
Residential Portfolio Segment [Member]
Originated prior	8,061,000		8,274,000
Originated four years before	0		0
Originated three years before	0		0
Originated two years before	0		0
Originated one years before	0		0
Originated current year	0		0
Total Term Loans	8,061,000		8,274,000
Financing Receivable Revolving	0		0
Loans	8,061,000		8,274,000
Nonaccrual	0		0
Originated prior, writeoff	0			0
Originated four years before, writeoff	0			0
Originated three years before, writeoff	0			0
Originated two years before, writeoff	0			0
Originated one years before, writeoff	0			0
Originated current year, writeoff	0			0
Financing Receivable, before Allowance for Credit Loss and Revolving Loans, Writeoff	0			0
Financing Receivable Revolving, Writeoff	0			0
Loans, Writeoff	(0)	(0)		0
Residential Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Loans	7,865,000		8,274,000
Residential Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans	196,000		0
Residential Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans	0		0
Residential Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	0		0
Residential Portfolio Segment [Member] | Pass [Member]
Originated prior	7,779,000		7,984,000
Originated four years before	0		0
Originated three years before	0		0
Originated two years before	0		0
Originated one years before	0		0
Originated current year	0		0
Total Term Loans	7,779,000		7,984,000
Financing Receivable Revolving	0		0
Loans	7,779,000		7,984,000
Residential Portfolio Segment [Member] | Substandard [Member]
Originated prior	282,000		290,000
Originated four years before	0		0
Originated three years before	0		0
Originated two years before	0		0
Originated one years before	0		0
Originated current year	0		0
Total Term Loans	282,000		290,000
Financing Receivable Revolving	0		0
Loans	282,000		290,000
Residential Portfolio Segment [Member] | Doubtful [Member]
Originated prior	0		0
Originated four years before	0		0
Originated three years before	0		0
Originated two years before	0		0
Originated one years before	0		0
Originated current year	0		0
Total Term Loans	0		0
Financing Receivable Revolving	0		0
Loans	0		0
Residential Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member]
Originated prior	0		0
Originated four years before	0		0
Originated three years before	0		0
Originated two years before	0		0
Originated one years before	0		0
Originated current year	0		0
Total Term Loans	0		0
Financing Receivable Revolving	0		0
Loans	0		0
Construction Portfolio Segment [Member]
Originated prior	0			0
Originated four years before	0			0
Originated three years before	0			0
Originated two years before	0			0
Originated one years before	0			0
Originated current year	0			0
Total Term Loans	0			0
Financing Receivable Revolving	5,064,000			5,064,000
Loans	5,064,000		5,064,000	5,064,000
Nonaccrual	0		0
Originated prior, writeoff	0			0
Originated four years before, writeoff	0			0
Originated three years before, writeoff	0			0
Originated two years before, writeoff	0			0
Originated one years before, writeoff	0			0
Originated current year, writeoff	0			0
Financing Receivable, before Allowance for Credit Loss and Revolving Loans, Writeoff	0			0
Financing Receivable Revolving, Writeoff	0			0
Loans, Writeoff	(0)	(0)		0
Construction Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Loans	5,064,000		5,064,000
Construction Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Loans	0		0
Construction Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Loans	0		0
Construction Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	0		0
Construction Portfolio Segment [Member] | Pass [Member]
Originated prior	0			0
Originated four years before	0			0
Originated three years before	0			0
Originated two years before	0			0
Originated one years before	0			0
Originated current year	0			0
Total Term Loans	0			0
Financing Receivable Revolving	0			0
Loans	0		0	0
Construction Portfolio Segment [Member] | Substandard [Member]
Originated prior	0			0
Originated four years before	0			0
Originated three years before	0			0
Originated two years before	0			0
Originated one years before	0			0
Originated current year	0			0
Total Term Loans	0			0
Financing Receivable Revolving	5,064,000			5,064,000
Loans	5,064,000		5,064,000	5,064,000
Construction Portfolio Segment [Member] | Doubtful [Member]
Originated prior	0			0
Originated four years before	0			0
Originated three years before	0			0
Originated two years before	0			0
Originated one years before	0			0
Originated current year	0			0
Total Term Loans	0			0
Financing Receivable Revolving	0			0
Loans	0		0	0
Construction Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member]
Originated prior	0			0
Originated four years before	0			0
Originated three years before	0			0
Originated two years before	0			0
Originated one years before	0			0
Originated current year	0			0
Total Term Loans	0			0
Financing Receivable Revolving	0			0
Loans	0		0	0
Consumer Portfolio Segment [Member]
Originated prior	14,992,000			6,274,000
Originated four years before	29,566,000			12,739,000
Originated three years before	45,127,000			33,870,000
Originated two years before	24,758,000			50,542,000
Originated one years before	22,970,000			27,430,000
Originated current year	4,460,000			24,905,000
Total Term Loans	141,873,000			155,760,000
Financing Receivable Revolving	14,532,000			16,026,000
Loans	156,405,000		171,786,000	171,786,000
Nonaccrual	0		0	0
Originated prior, writeoff	55,000			246,000
Originated four years before, writeoff	400,000			388,000
Originated three years before, writeoff	545,000			2,376,000
Originated two years before, writeoff	267,000			1,843,000
Originated one years before, writeoff	203,000			913,000
Originated current year, writeoff	0			162,000
Financing Receivable, before Allowance for Credit Loss and Revolving Loans, Writeoff	1,470,000			5,928,000
Financing Receivable Revolving, Writeoff	55,000			463,000
Loans, Writeoff	1,525,000	$ 2,003,000		6,391,000
Consumer Portfolio Segment [Member] | Term Loan Originated Prior [Member]
Nonaccrual	0			0
Consumer Portfolio Segment [Member] | Term Loans Originated Four Years Prior [Member]
Nonaccrual	0			0
Consumer Portfolio Segment [Member] | Term Loans Originated Three Years Prior [Member]
Nonaccrual	0			0
Consumer Portfolio Segment [Member] | Term Loans Originated Two Years Prior [Member]
Nonaccrual	0			0
Consumer Portfolio Segment [Member] | Term Loans Originated One Year Prior [Member]
Nonaccrual	0			0
Consumer Portfolio Segment [Member] | Term Loans Originated Current Year [Member]
Nonaccrual	0			0
Consumer Portfolio Segment [Member] | Total Term Loans [Member]
Total Term Loans	0			0
Consumer Portfolio Segment [Member] | Revolving Loans Amortized Cost Basis [Member]
Nonaccrual	0			0
Consumer Portfolio Segment [Member] | Financial Asset, Not Past Due [Member]
Originated prior	14,575,000			6,068,000
Originated four years before	28,719,000			12,464,000
Originated three years before	43,829,000			32,608,000
Originated two years before	24,305,000			48,694,000
Originated one years before	22,626,000			26,805,000
Originated current year	4,460,000			24,522,000
Total Term Loans	138,514,000			151,161,000
Financing Receivable Revolving	14,452,000			15,714,000
Loans	152,966,000		166,875,000	166,875,000
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member]
Originated prior	339,000			173,000
Originated four years before	707,000			201,000
Originated three years before	1,016,000			949,000
Originated two years before	297,000			1,392,000
Originated one years before	157,000			385,000
Originated current year	0			263,000
Total Term Loans	2,516,000			3,363,000
Financing Receivable Revolving	27,000			130,000
Loans	2,543,000		3,493,000	3,493,000
Consumer Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member]
Originated prior	29,000			33,000
Originated four years before	72,000			36,000
Originated three years before	204,000			184,000
Originated two years before	100,000			256,000
Originated one years before	165,000			91,000
Originated current year	0			120,000
Total Term Loans	570,000			720,000
Financing Receivable Revolving	49,000			164,000
Loans	619,000		884,000	884,000
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Originated prior	49,000			0
Originated four years before	68,000			38,000
Originated three years before	78,000			129,000
Originated two years before	56,000			200,000
Originated one years before	22,000			149,000
Originated current year	0			0
Total Term Loans	273,000			516,000
Financing Receivable Revolving	4,000			18,000
Loans	277,000		534,000	$ 534,000
Consumer Portfolio Segment [Member] | Pass [Member]
Loans	154,279,000		169,251,000
Consumer Portfolio Segment [Member] | Substandard [Member]
Loans	1,717,000		1,817,000
Consumer Portfolio Segment [Member] | Doubtful [Member]
Loans	99,000		192,000
Consumer Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member]
Loans	$ 310,000		$ 526,000

X

- Definition

Amount of writeoff of financing receivable, charged against allowance for credit loss.

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Amortized cost of financing receivable originated in current fiscal year. Excludes net investment in lease.

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Amortized cost of financing receivable originated in fiscal year prior to current fiscal year. Excludes net investment in lease.

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Amortized cost of financing receivable originated three years prior to current fiscal year. Excludes net investment in lease.

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