Segment Reporting (Tables)

12 Months Ended

Jan. 31, 2014

Segment Reporting [Abstract]

Summarized Operating Results and Certain Financial Position Data of Company's Reportable Continuing Business Segments

Presented below are summarized operating results and certain financial position data of the Company’s reportable continuing business segments for the years ended January 31, 2014, 2013 and 2012. The “Other” column includes the Company’s corporate and unallocated expenses.

Fiscal Year Ended January 31, 2014

	Power Industry Services		Telecom Infrastructure Services		Other			Consolidated
Revenues	$	218,649,000	$	8,806,000	$	—		$	227,455,000
Cost of revenues		141,807,000		6,800,000		—			148,607,000
Gross profit		76,842,000		2,006,000		—			78,848,000
Selling, general and administrative expenses		7,575,000		1,331,000		4,012,000			12,918,000
		69,267,000		675,000		(4,012,000	)		65,930,000
Gains on the deconsolidation of VIEs		2,444,000		—		—			2,444,000
Other income (expense), net		958,000		—		3,000			961,000
Income (loss) from continuing operations before income taxes	$	72,669,000	$	675,000	$	(4,009,000	)		69,335,000
Income tax expense									25,991,000
Income from continuing operations								$	43,344,000
Amortization of purchased intangible assets	$	243,000	$	—	$	—		$	243,000
Depreciation	$	366,000	$	180,000	$	3,000		$	549,000
Fixed asset additions	$	1,067,000	$	69,000	$	—		$	1,136,000
Goodwill	$	18,476,000	$	—	$	—		$	18,476,000
Total assets	$	276,744,000	$	1,989,000	$	44,573,000		$	323,306,000
Current assets	$	252,603,000	$	1,293,000	$	44,663,000		$	298,559,000
Current liabilities	$	163,534,000	$	511,000	$	1,191,000		$	165,236,000

Fiscal Year Ended January 31, 2013

	Power Industry Services			Telecom Infrastructure Services		Other			Consolidated
Revenues	$	261,327,000		$	17,308,000	$	—		$	278,635,000
Cost of revenues		214,817,000			13,683,000		—			228,500,000
Gross profit		46,510,000			3,625,000		—			50,135,000
Selling, general and administrative expenses		7,950,000			1,628,000		4,772,000			14,350,000
		38,560,000			1,997,000		(4,772,000	)		35,785,000
Other income (expense), net		(45,000	)		—		2,000			(43,000	)
Income (loss) from continuing operations before income taxes	$	38,515,000		$	1,997,000	$	(4,770,000	)		35,742,000
Income tax expense										13,640,000
Income from continuing operations									$	22,102,000
Amortization of purchased intangible assets	$	243,000		$	—	$	—		$	243,000
Depreciation	$	290,000		$	229,000	$	3,000		$	522,000
Fixed asset additions	$	6,986,000		$	277,000	$	—		$	7,263,000
Goodwill	$	18,476,000		$	—	$	—		$	18,476,000
Total assets	$	186,284,000		$	4,032,000	$	44,408,000		$	234,724,000
Current assets	$	158,567,000		$	3,486,000	$	42,055,000		$	204,108,000
Current liabilities	$	110,828,000		$	1,346,000	$	3,372,000		$	115,546,000

Fiscal Year Ended January 31, 2012

	Power Industry Services		Telecom Infrastructure Services		Other			Consolidated
Revenues	$	132,519,000	$	9,331,000	$	—		$	141,850,000
Cost of revenues		111,193,000		7,555,000		—			118,748,000
Gross profit		21,326,000		1,776,000		—			23,102,000
Selling, general and administrative expenses		6,235,000		1,586,000		3,365,000			11,186,000
		15,091,000		190,000		(3,365,000	)		11,916,000
Other income (expense), net		33,000		—		15,000			48,000
Income (loss) from continuing operations before income taxes	$	15,124,000	$	190,000	$	(3,350,000	)		11,964,000
Income tax expense									4,556,000
Income from continuing operations								$	7,408,000
Amortization of purchased intangible assets	$	334,000	$	—	$	—		$	334,000
Depreciation	$	207,000	$	244,000	$	4,000		$	455,000
Fixed asset additions	$	1,598,000	$	136,000	$	4,000		$	1,738,000
Goodwill	$	18,476,000	$	—	$	—		$	18,476,000
Total assets	$	164,049,000	$	3,121,000	$	38,082,000		$	205,252,000
Current assets	$	141,561,000	$	2,626,000	$	36,390,000		$	180,577,000
Current liabilities	$	101,709,000	$	1,065,000	$	1,505,000		$	104,279,000