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GEOGRAPHIC CONCENTRATION OF CUSTOMERS (Details)	12 Months Ended
	Dec. 31, 2017 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	84,200
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	1,800

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

- 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

X

- Details

Name:	us-gaap_ConsolidatedEntitiesAxis=artna_ArtesianWaterMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ConsolidatedEntitiesAxis=artna_ArtesianWaterMarylandMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ConsolidatedEntitiesAxis=artna_ArtesianWaterPennsylvaniaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ConsolidatedEntitiesAxis=artna_ArtesianWastewaterMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: