XML 42 R23.htm IDEA: XBRL DOCUMENT
v3.8.0.1

LEGAL PROCEEDINGS | 12 Months Ended
--- | ---
Dec. 31, 2017
Legal Proceedings [Abstract] |
LEGAL PROCEEDINGS | NOTE 16 LEGAL PROCEEDINGS Periodically, we are involved in other proceedings or litigation arising in the ordinary course of business. We do not believe that the ultimate resolution of these matters will materially affect our business, financial position or results of operations. However, we cannot assure that we will prevail in any litigation and, regardless of the outcome, may incur significant litigation expense and may have significant diversion of management attention.

X
- References No definition available. + Details
Name: | artna_LegalProceedingsAbstract
Namespace Prefix: | artna_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The entire disclosure for legal proceedings, legal contingencies, litigation, regulatory and environmental matters and other contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -URI http://asc.fasb.org/topic&trid=2127136 + Details
Name: | us-gaap_LegalMattersAndContingenciesTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration