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v3.22.1

GENERAL (Details) gal / d in Millions | 3 Months Ended
--- | ---
Mar. 31, 2022 gal / d Squarefeet Plan Facility Subsidiary
Business Operations [Abstract] |
Number of subsidiaries not regulated | Subsidiary | 3
Artesian Development purchased area of office space (in square feet) | 10,000
Artesian Development purchased area of warehouse space (in square feet) | 10,000
Artesian Utility [Member] |
Business Operations [Abstract] |
Capacity of wastewater treatment facilities | gal / d | 3.8
Initial contract period of operating wastewater treatment facilities in Middletown | 20 years
Number of wastewater treatment systems facility operations in Middletown | Facility | 3
Number of protection plans offered to customers | Plan | 3

X
- Definition Area of office space in facility. + References No definition available. + Details
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Namespace Prefix: | artna_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Area of warehouse space in facility. + References No definition available. + Details
Name: | artna_AreaOfWarehouseSpaceInFacility
Namespace Prefix: | artna_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | artna_BusinessOperationsAbstract
Namespace Prefix: | artna_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Minimum capacity of wastewater treatment facilities per day. + References No definition available. + Details
Name: | artna_CapacityOfWastewaterTreatmentFacilitiesMinimum
Namespace Prefix: | artna_
Data Type: | dtr-types:flowItemType
Balance Type: | na
Period Type: | duration

X
- Definition Contract period of operating wastewater treatment facilities. + References No definition available. + Details
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Namespace Prefix: | artna_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of protection plans offered to customers by the entity. + References No definition available. + Details
Name: | artna_NumberOfProtectionPlansOfferedToCustomers
Namespace Prefix: | artna_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of subsidiaries not regulated. + References No definition available. + Details
Name: | artna_NumberOfSubsidiariesNotRegulated
Namespace Prefix: | artna_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of wastewater treatment stations that are currently in operation for a specific facility or area. + References No definition available. + Details
Name: | artna_NumberOfWastewaterTreatmentStationsInOperationInServiceAreaFacilities
Namespace Prefix: | artna_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=artna_ArtesianUtilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |