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NON-UTILITY OPERATING REVENUE AND EXPENSES (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Public Utility, Property, Plant and Equipment [Line Items]
Non-utility operating revenue	$ 4,150us-gaap_OtherSalesRevenueNet	$ 3,974us-gaap_OtherSalesRevenueNet	$ 3,787us-gaap_OtherSalesRevenueNet
Summary of non-utility operating expenses [Abstract]
Non-utility operating expenses	2,193us-gaap_OtherCostAndExpenseOperating	2,121us-gaap_OtherCostAndExpenseOperating	2,100us-gaap_OtherCostAndExpenseOperating
Artesian Utility [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Non-utility operating revenue	4,100us-gaap_OtherSalesRevenueNet / us-gaap_PublicUtilityAxis = artna_ArtesianUtilityMember	3,900us-gaap_OtherSalesRevenueNet / us-gaap_PublicUtilityAxis = artna_ArtesianUtilityMember	3,200us-gaap_OtherSalesRevenueNet / us-gaap_PublicUtilityAxis = artna_ArtesianUtilityMember
Summary of non-utility operating expenses [Abstract]
Non-utility operating expenses	2,147us-gaap_OtherCostAndExpenseOperating / us-gaap_PublicUtilityAxis = artna_ArtesianUtilityMember	2,052us-gaap_OtherCostAndExpenseOperating / us-gaap_PublicUtilityAxis = artna_ArtesianUtilityMember	1,777us-gaap_OtherCostAndExpenseOperating / us-gaap_PublicUtilityAxis = artna_ArtesianUtilityMember
Artesian Development [Member]
Summary of non-utility operating expenses [Abstract]
Non-utility operating expenses	46us-gaap_OtherCostAndExpenseOperating / us-gaap_PublicUtilityAxis = artna_ArtesianDevelopmentMember	40us-gaap_OtherCostAndExpenseOperating / us-gaap_PublicUtilityAxis = artna_ArtesianDevelopmentMember	42us-gaap_OtherCostAndExpenseOperating / us-gaap_PublicUtilityAxis = artna_ArtesianDevelopmentMember
Artesian Resources [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Non-utility operating revenue	0us-gaap_OtherSalesRevenueNet / us-gaap_PublicUtilityAxis = us-gaap_ParentCompanyMember	0us-gaap_OtherSalesRevenueNet / us-gaap_PublicUtilityAxis = us-gaap_ParentCompanyMember	600us-gaap_OtherSalesRevenueNet / us-gaap_PublicUtilityAxis = us-gaap_ParentCompanyMember
Summary of non-utility operating expenses [Abstract]
Non-utility operating expenses	0us-gaap_OtherCostAndExpenseOperating / us-gaap_PublicUtilityAxis = us-gaap_ParentCompanyMember	0us-gaap_OtherCostAndExpenseOperating / us-gaap_PublicUtilityAxis = us-gaap_ParentCompanyMember	263us-gaap_OtherCostAndExpenseOperating / us-gaap_PublicUtilityAxis = us-gaap_ParentCompanyMember
Artesian Consulting Engineers [Member]
Summary of non-utility operating expenses [Abstract]
Non-utility operating expenses	$ 0us-gaap_OtherCostAndExpenseOperating / us-gaap_PublicUtilityAxis = artna_ArtesianConsultingEngineersMember	$ 29us-gaap_OtherCostAndExpenseOperating / us-gaap_PublicUtilityAxis = artna_ArtesianConsultingEngineersMember	$ 18us-gaap_OtherCostAndExpenseOperating / us-gaap_PublicUtilityAxis = artna_ArtesianConsultingEngineersMember

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- Definition

The total amount of other operating cost and expense items that are associated with the entity's normal revenue producing operation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.3)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

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Revenues from the sale of other goods or rendering of other services, not elsewhere specified in the taxonomy; net of (reduced by) sales adjustments, returns, allowances, and discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1(a),(d))

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688



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