No definition available.

Name:	artna_CashPaidForAmountsIncludedInTheMeasurementOfLeaseLiabilitiesAbstract
Namespace Prefix:	artna_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The increases or decreases in lease payments that result from changes occurring after the inception of the lease in the factors (other than the passage of time) on which lease payments are based, except that any escalation of minimum lease payments relating to increases in construction or acquisition cost of the leased property or for increases in some measure of cost or value during the construction or preconstruction period, are excluded from contingent rentals. Contingent rentals also may include amounts for which the triggering events have not yet occurred or the specified targets for which have not yet been achieved (such as sales based percentage rent), but which events are considered probable of occurring or which specified targets are considered probable of being achieved.

+ References

No definition available.

LEASES (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
LEASES (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Operating Lease, Description [Abstract]
Percentage of increase in annual lease payments			3.00%
Rent Expense [Abstract]
Minimum rentals	$ 4	$ 4	$ 13	$ 11
Contingent rentals	0	0	0	0
Rent expenses	4	$ 4	13	11
Cash paid for amounts included in the measurement of lease liabilities [Abstract]
Operating cash flows from operating leases			13	11
Right-of-use assets obtained in exchange for lease obligations [Abstract]
Operating leases			499	$ 498
Operating leases [Abstract]
Operating lease right-of-use assets	499		499		$ 506
Operating lease, liability [Abstract]
Other current liabilities	10		10		9
Operating lease liabilities	496		496		503
Total operating lease liabilities	$ 506		$ 506		$ 512
Weighted Average Remaining Lease Term [Abstract]
Operating leases	57 years		57 years		58 years
Weighted Average Discount Rate [Abstract]
Operating leases	5.00%		5.00%		5.00%
Maturities of Operating Lease Liabilities [Abstract]
2024	$ 35		$ 35
2025	35		35
2026	35		35
2027	31		31
2028	27		27
Thereafter	1,424		1,424
Total undiscounted lease payments	1,587		1,587
Less effects of discounting	(1,081)		(1,081)
Total lease liabilities recognized	$ 506		$ 506		$ 512
Minimum [Member]
Operating Lease, Description [Abstract]
Remaining lease term	4 years		4 years
Maximum [Member]
Operating Lease, Description [Abstract]
Remaining lease term	72 years		72 years
Option to extend lease term	66 years		66 years