Long-Term Debt Long-Term Debt (Details Textuals) (Gas [Member], Mortgages [Member], USD $) In Millions, unless otherwise specified	Sep. 30, 2013
Ten Years [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount, Future Issuance	$ 50
Future Debt Instrument, Interest Rate, Stated Percentage	3.64%
Twelve Years [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount, Future Issuance	70
Future Debt Instrument, Interest Rate, Stated Percentage	3.74%
Fifteen Years [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount, Future Issuance	$ 50
Future Debt Instrument, Interest Rate, Stated Percentage	3.94%