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Business (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Sep. 30, 2012 numberoffacilities	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2012 numberoffacilities	Sep. 30, 2011	Sep. 30, 2010
Business Transactions [Line Items]
Revenues	$ 123,381	$ 116,128	$ 107,608	$ 108,998	$ 110,661	$ 104,286	$ 100,033	$ 91,161	$ 456,115	$ 406,141	$ 382,431
Senior subordinated loan Tontine Term Loan	10,480				10,498				10,480	10,498
Fair value of our investment in EnerTech	919				1,003				919	1,003
Locations [Line Items]
Number of locations	61								61
Communications [Member]
Business Transactions [Line Items]
Revenues									121,492	83,615	69,171
Locations [Line Items]
Number of locations	10								10
Residential [Member]
Business Transactions [Line Items]
Revenues									129,974	114,732	115,947
Locations [Line Items]
Number of locations	32								32
Commercial & Industrial [Member]
Business Transactions [Line Items]
Revenues									$ 204,649	$ 207,794	$ 197,313
Locations [Line Items]
Number of locations	19								19

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

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