Operation Segments (Tables)

12 Months Ended

Sep. 30, 2015

Operating Segments [Abstract]

Schedule of Segment Reporting Information, by Segment [Table Text Block]

		Years Ended September 30, 2015
							Commercial &		Infrastructure
			Communications		Residential		Industrial		Solutions		Corporate		Total
Revenues			$	141,858	$	206,307	$	178,865	$	46,827	$	-	$	573,857
Cost of services				116,015		164,435		157,322		36,194		-		473,966
Gross profit				25,843		41,872		21,543		10,633		-		99,891
Selling, general and administrative				15,735		31,877		15,027		9,498		9,279		81,416
Gain on sale of assets				(18)		4		(11)		12		-		(13)
Income (loss) from operations			$	10,126	$	9,991	$	6,527	$	1,123	$	(9,279)	$	18,488
Other data:
	Depreciation and amortization expense		$	512	$	485	$	283	$	952	$	277	$	2,509
	Capital expenditures			675		352		391		1,197		164		2,779
	Total assets		$	49,500	$	37,755	$	44,156	$	30,112	$	65,187	$	226,710

		Years Ended September 30, 2014
							Commercial &		Infrastructure
			Communications		Residential		Industrial		Solutions		Corporate		Total
Revenues			$	116,073	$	182,514	$	166,249	$	47,559	$	-	$	512,395
Cost of services				94,904		148,685		148,081		37,599		-		429,269
Gross profit				21,169		33,829		18,168		9,960		-		83,126
Selling, general and administrative				13,481		27,947		14,479		9,346		10,318		75,571
Loss (gain) on sale of assets				6		4		(46)		(50)		-		(86)
Income (loss) from operations			$	7,682	$	5,878	$	3,735	$	664	$	(10,318)	$	7,641
Other data:
	Depreciation and amortization expense		$	414	$	491	$	270	$	980	$	371	$	2,526
	Capital expenditures			331		420		266		828		137		1,982
	Total assets		$	30,415	$	40,555	$	43,937	$	27,272	$	58,929	$	201,108

		Years Ended September 30, 2013
							Commercial &		Infrastructure
			Communications		Residential		Industrial		Solutions		Corporate		Total
Revenues			$	126,348	$	162,611	$	203,481	$	2,153	$	-	$	494,593
Cost of services				102,564		135,384		187,957		1,728		-		427,633
Gross profit				23,784		27,227		15,524		425		-		66,960
Selling, general and administrative				13,610		25,447		14,362		337		12,842		66,598
Gain on sale of assets				-		(17)		(46)		-		(1)		(64)
Income (loss) from operations			$	10,174	$	1,797	$	1,208	$	88	$	(12,841)	$	426
Other data:
	Depreciation and amortization expense		$	372	$	807	$	247	$	38	$	1,088	$	2,552
	Capital expenditures			269		209		270		5		-		753
	Total assets		$	24,858	$	36,838	$	55,342	$	27,889	$	34,325	$	179,252