Deferred Charges And Credits (Schedule Of Regulatory Liabilities) (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Regulatory Liabilities [Line Items]
Regulatory liabilities	$ 1,769,172	$ 1,703,277
Refundable Consumer Advances For Construction[Member]
Regulatory Liabilities [Line Items]
Regulatory liabilities	777,323	727,917
Estimated Initial Installation Costs Of Meters [Member]
Regulatory Liabilities [Line Items]
Regulatory liabilities	92,149	75,660
Postretirement Benefit Costs [Member]
Regulatory Liabilities [Line Items]
Regulatory liabilities	$ 899,700	$ 899,700

The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 71

-Paragraph 11

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Name:	us-gaap_RegulatoryLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant