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: