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BASIS OF PRESENTATION AND ADJUSTMENTS (Details)	9 Months Ended
	Sep. 30, 2014 USD ($)
BASIS OF PRESENTATION [Abstract]
Property and Other Taxes Adjustment	$ 26,000
Utility Plant Adjustment	419,000
Utility Operating Expenses Adjustment	$ 393,000

X

- Definition

Adjustment to property and other taxes for personnel costs charged to overhead for capital projects.

+ References

No definition available.

+ Details

Name:	artna_PropertyAndOtherTaxesAdjustment
Namespace Prefix:	artna_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Adjustment to utility operating expenses for personnel costs charged to overhead for capital projects.

+ References

No definition available.

+ Details

Name:	artna_UtilityOperatingExpensesAdjustment
Namespace Prefix:	artna_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Adjustment to utility plant for personnel costs charged to overhead for capital projects.

+ References

No definition available.

+ Details

Name:	artna_UtilityPlantAdjustment
Namespace Prefix:	artna_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

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