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GEOGRAPHIC CONCENTRATION OF CUSTOMERS (Details) | 12 Months Ended
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Dec. 31, 2016 County Customer
Concentration Risk [Line Items] |
Number of counties in which water utility service provided | County | 3
Artesian Water [Member] |
Concentration Risk [Line Items] |
Number of customers | 82,700
Artesian Water Maryland [Member] |
Concentration Risk [Line Items] |
Number of customers | 2,300
Artesian Water Pennsylvania [Member] |
Concentration Risk [Line Items] |
Number of customers | 40
Artesian Wastewater [Member] |
Concentration Risk [Line Items] |
Number of customers | 1,600

X
- Definition This line item represents the number of counties in which water utility service provided. + References No definition available. + Details
Name: | artna_NumberOfCountiesInWhichWaterUtilityServiceProvided
Namespace Prefix: | artna_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents number of customers to whom service is provided by the entity. + References No definition available. + Details
Name: | artna_NumberOfCustomers
Namespace Prefix: | artna_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- 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
Name: | us-gaap_ConcentrationRiskLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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

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

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