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GEOGRAPHIC CONCENTRATION OF CUSTOMERS (Details) | 9 Months Ended
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Sep. 30, 2021 Customer County
Concentration Risks [Abstract] |
Number of counties in which water utility service provided | County | 3
Large Industrial Customer [Member] |
Concentration Risks [Abstract] |
Number of customers | 1
Artesian Water [Member] |
Concentration Risks [Abstract] |
Number of customers | 91,300
Artesian Water Maryland [Member] |
Concentration Risks [Abstract] |
Number of customers | 2,500
Artesian Water Pennsylvania [Member] |
Concentration Risks [Abstract] |
Number of customers | 40
Artesian Wastewater [Member] |
Concentration Risks [Abstract] |
Number of customers | 3,100

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- References No definition available. + Details
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Namespace Prefix: | artna_
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- Definition This line item represents the number of counties in which water utility service provided. + References No definition available. + Details
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Namespace Prefix: | artna_
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- Definition Represents number of customers to whom service is provided by the entity. + References No definition available. + Details
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- Details
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Namespace Prefix: |
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- Details
Name: | srt_ConsolidatedEntitiesAxis=artna_ArtesianWaterMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_ConsolidatedEntitiesAxis=artna_ArtesianWaterMarylandMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_ConsolidatedEntitiesAxis=artna_ArtesianWaterPennsylvaniaMember
Namespace Prefix: |
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Period Type: |

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- Details
Name: | srt_ConsolidatedEntitiesAxis=artna_ArtesianWastewaterMember
Namespace Prefix: |
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Balance Type: |
Period Type: |