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Segment Reporting - Financial Information by Business Segment (Revenues) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 30, 2014	Apr. 30, 2013
Segment Reporting Information [Line Items]
Revenues	$ 25,732	$ 27,291
Operating income	4,772	8,183
Income before taxes	4,846	7,919
Equipment Leasing [Member]
Segment Reporting Information [Line Items]
Revenues	19,672	23,364
Operating income	3,278	8,158
Income before taxes	3,523	7,835
Seamap [Member]
Segment Reporting Information [Line Items]
Revenues	6,197	3,934
Operating income	1,500	(26)
Income before taxes	1,329	33
Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	(137)	(7)
Operating income	(6)	51
Income before taxes	$ (6)	$ 51

X

- Definition

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

+ References

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

+ Details

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X

- Definition

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

+ References

No definition available.

+ Details

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X

- 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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