Operating Segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012	Sep. 30, 2012
Segment Reporting Information [Line Items]
Revenues	$ 121,995	$ 107,608	$ 249,259	$ 216,606
Cost of Services	105,999	93,819	215,283	189,624
Gross Profit	15,996	13,789	33,976	26,982
Selling, General and Administrative Expense	16,606	14,407	31,528	27,091
Loss (gain) on sale of assets	(21)	(19)	(40)	(155)
Operating Income (Loss)	(589)	(599)	2,488	46
Depreciation and amortization	539	519	1,078	1,019
Capital Expenditures	295	252	375	1,139
Assets	153,253	159,179	153,253	159,179	164,713
Communications
Segment Reporting Information [Line Items]
Revenues	31,806	28,430	71,925	53,591
Cost of Services	25,975	24,374	58,862	45,970
Gross Profit	5,831	4,056	13,063	7,621
Selling, General and Administrative Expense	3,301	3,165	6,860	5,875
Loss (gain) on sale of assets	0	0	0	(60)
Operating Income (Loss)	2,530	891	6,203	1,806
Depreciation and amortization	92	65	179	117
Capital Expenditures	130	239	171	239
Assets	25,366	18,502	25,366	18,502
Residential
Segment Reporting Information [Line Items]
Revenues	39,344	29,628	75,349	58,900
Cost of Services	32,564	25,097	62,463	49,721
Gross Profit	6,780	4,531	12,886	9,179
Selling, General and Administrative Expense	6,412	4,532	11,640	8,946
Loss (gain) on sale of assets	(12)	3	(21)	7
Operating Income (Loss)	380	(4)	1,267	226
Depreciation and amortization	89	90	185	172
Capital Expenditures	68	8	94	34
Assets	38,714	27,318	38,714	27,318
Commercial & Industrial
Segment Reporting Information [Line Items]
Revenues	50,845	49,550	101,985	104,115
Cost of Services	47,460	44,350	93,958	93,925
Gross Profit	3,385	5,200	8,027	10,190
Selling, General and Administrative Expense	3,609	4,506	7,345	8,607
Loss (gain) on sale of assets	(9)	(22)	(19)	(102)
Operating Income (Loss)	(215)	716	701	1,685
Depreciation and amortization	59	61	115	140
Capital Expenditures	97	5	110	5
Assets	53,531	67,087	53,531	67,087
Corporate
Segment Reporting Information [Line Items]
Revenues	0	0	0	0
Cost of Services	0	(2)	0	8
Gross Profit	0	2	0	(8)
Selling, General and Administrative Expense	3,284	2,204	5,683	3,663
Loss (gain) on sale of assets	0	0	0	0
Operating Income (Loss)	(3,284)	(2,202)	(5,683)	(3,671)
Depreciation and amortization	299	303	599	590
Capital Expenditures	0	0	0	861
Assets	$ 35,642	$ 46,272	$ 35,642	$ 46,272