Deferred Charges And Liabilities (Schedule Of Deferred Credits, Or Regulatory Liabilities) (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Regulatory Liabilities [Line Items]
Total deferred liabilities	$ 1,249,390	$ 1,179,414
Refundable Consumer Advances For Construction [Member]
Regulatory Liabilities [Line Items]
Total deferred liabilities	416,263	328,360
Estimated Initial Installation Costs For Meters [Member]
Regulatory Liabilities [Line Items]
Total deferred liabilities	100,927	118,854
Post Retirement Benefit Obligation [Member]
Regulatory Liabilities [Line Items]
Total deferred liabilities	$ 732,200	$ 732,200