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GEOGRAPHIC CONCENTRATION OF CUSTOMERS (Details)	12 Months Ended
	Dec. 31, 2012
Concentration Risk [Line Items]
Number of counties in which water utility service provided	3
Artesian Water [Member]
Concentration Risk [Line Items]
Number of customers	79,000
Artesian Water Maryland [Member]
Concentration Risk [Line Items]
Number of customers	2,200
Artesian Water Pennsylvania [Member]
Concentration Risk [Line Items]
Number of customers	38
Artesian Wastewater [Member]
Concentration Risk [Line Items]
Number of customers	1,000

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