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GENERAL (Details) gal in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 gal / d gal Squarefeet Facility WaterSystem Subsidiary Plan
Business Operations [Abstract] |
Number of wholly owned subsidiaries | Subsidiary | 8
Number of subsidiaries not regulated | Subsidiary | 3
Artesian Development purchased area of office space (in square feet) | Squarefeet | 10,000
Artesian Development purchased area of warehouse space (in square feet) | Squarefeet | 10,000
Artesian Wastewater [Member] |
Business Operations [Abstract] |
Number of wastewater treatment facilities owned and operated | Facility | 4
Capacity of wastewater treatment facilities | 500,000
Number of other's system efficiently and cost effectively manages wastewater transmission, treatment and disposal | WaterSystem | 1
Disposal facility and spray irrigation to agricultural land | gal | 90
Maximum supply amount of water per day | 1,500,000
Artesian Utility [Member] |
Business Operations [Abstract] |
Capacity of wastewater treatment facilities | 2,800,000
Initial contract period of operating wastewater treatment facilities in Middletown | 20 years
Number of wastewater treatment station facility operations in Middletown | Facility | 2
Number of protection plans offered to customers | Plan | 3

X
- Definition Area of office space in facility. + References No definition available. + Details
Name: | artna_AreaOfOfficeSpaceInFacility
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
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Namespace Prefix: | artna_
Data Type: | us-types:flowItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition A substantially completed a disposal facility and spray irrigation to agricultural land. + References No definition available. + Details
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Namespace Prefix: | artna_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Refers to the maximum supply amount of water per day. + References No definition available. + Details
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Namespace Prefix: | artna_
Data Type: | us-types:flowItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of wastewater treatment facilities owns and operates by company. + References No definition available. + Details
Name: | artna_NumberOfFacilitiesOwnsAndOperates
Namespace Prefix: | artna_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents number of other's system efficiently and cost effectively manages wastewater transmission, treatment and disposal. + References No definition available. + Details
Name: | artna_NumberOfOtherSSystemEfficientlyAndCostEffectivelyManagesWastewaterTransmissionTreatmentAndDisposal
Namespace Prefix: | artna_
Data Type: | xbrli:integerItemType
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
- Definition Wholly owned subsidiaries of Artesian Resources Corporation. + References No definition available. + Details
Name: | artna_NumberOfWhollyOwnedSubsidiaries
Namespace Prefix: | artna_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |