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BASIS OF PRESENTATION (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2025	Dec. 31, 2024
BASIS OF PRESENTATION [Abstract]
Depreciation rates of water utility plant	1.92%	1.93%
Minimum [Member]
BASIS OF PRESENTATION [Abstract]
Estimated useful life	5 years
Amortization period of other deferred assets	5 years
Maximum [Member]
BASIS OF PRESENTATION [Abstract]
Estimated useful life	85 years
Amortization period of other deferred assets	80 years

X

- Definition

Represents amortization period of other deferred assets.

+ References

No definition available.

+ Details

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X

- Definition

Represents depreciation rates of water utility plant during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	artna_
Data Type:	dtr:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
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- Details

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- Details

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