XML 68 R53.htm IDEA: XBRL DOCUMENT
v3.19.1

GEOGRAPHIC CONCENTRATION OF CUSTOMERS (Details) | 12 Months Ended
--- | ---
Dec. 31, 2018 County Customer
Concentration Risks [Abstract] |
Number of counties in which water utility service provided | County | 3
Artesian Water [Member] |
Concentration Risks [Abstract] |
Number of customers | 85,900
Artesian Water Maryland [Member] |
Concentration Risks [Abstract] |
Number of customers | 2,400
Artesian Water Pennsylvania [Member] |
Concentration Risks [Abstract] |
Number of customers | 40
Artesian Wastewater [Member] |
Concentration Risks [Abstract] |
Number of customers | 2,100

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

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

X
- 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

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

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

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

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