Segment Reporting (Tables)

12 Months Ended

Jan. 31, 2013

Segment Reporting Information [Line Items]

Reconciliation of income (loss) before taxes

	Years Ended January 31,
	2013			2012		2011
Equipment Leasing	$	2,865		$	24,081	$	1,527
Seamap		10,835			10,195		5,402
Reconciling items:
Elimination of (profit) loss from inter-company sales		(176	)		54		(135	)
Consolidated income before taxes	$	13,524		$	34,330	$	6,794

Assets [Member]

Segment Reporting Information [Line Items]

Financial information by business segment

	As of January 31, 2013						As of January 31, 2012						As of January 31, 2011
	Equipment Leasing		Seamap		Consolidated		Equipment Leasing		Seamap		Consolidated		Equipment Leasing		Seamap		Consolidated
Fixed assets, net	$	118,801	$	807	$	119,608	$	119,824	$	553	$	120,377	$	78,586	$	509	$	79,095
Intangible assets, net		2,111		1,878		3,989		2,511		2,185		4,696		2,936		2,422		5,358
Goodwill		—		4,320		4,320		—		4,320		4,320		—		4,320		4,320
Total Assets		171,971		18,578		190,407		175,930		22,630		198,229		118,929		19,569		137,971

Revenue [Member]

Segment Reporting Information [Line Items]

Financial information by business segment

	Years Ended January 31,
	2013						2012								2011
	Equipment Leasing		Seamap		Consolidated		Equipment Leasing			Seamap		Consolidated			Equipment Leasing			Seamap			Consolidated
Revenues	$	73,516	$	32,210	$	104,685	$	84,428		$	28,703	$	112,834		$	50,018		$	22,462		$	71,363
Interest income (expense), net		11		—		11		(397	)		1		(396	)		(470	)		(3	)		(473	)
Income before taxes		2,865		10,835		13,524		24,081			10,195		34,330			1,527			5,402			6,794
Capital expenditures		45,181		478		45,659		63,198			469		63,667			32,876			243			33,119
Depreciation and amortization expense		34,320		619		34,939		28,215			559		28,774			22,120			597			22,717