Segment Reporting - Financial Information by Business Segment (Revenues) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2014	Jul. 31, 2013
Segment Reporting Information [Line Items]
Revenues	$ 19,545	$ 20,895	$ 45,277	$ 48,186
Operating (loss) income	(3,996)	(2,126)	776	6,057
(Loss) income before taxes	(4,023)	(966)	823	6,953
Equipment Leasing [Member]
Segment Reporting Information [Line Items]
Revenues	11,836	13,937	31,508	37,301
Operating (loss) income	(4,827)	(3,428)	(1,549)	4,730
(Loss) income before taxes	(4,755)	(2,504)	(1,232)	5,331
Seamap [Member]
Segment Reporting Information [Line Items]
Revenues	8,008	7,042	14,205	10,976
Operating (loss) income	990	1,260	2,490	1,234
(Loss) income before taxes	891	1,496	2,220	1,529
Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	(299)	(84)	(436)	(91)
Operating (loss) income	(159)	42	(165)	93
(Loss) income before taxes	$ (159)	$ 42	$ (165)	$ 93

Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(h)(1)(i))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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- Definition

The net result for the period of deducting operating expenses from operating revenues.

+ References

No definition available.

+ Details

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

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