Net Sales of Domestic and Foreign Units (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Nov. 30, 2012	Nov. 30, 2011	Nov. 30, 2012	Nov. 30, 2011
Segment Reporting Information [Line Items]
Net Sales	$ 30,387	$ 34,009	$ 95,148	$ 104,462
Domestic Net Sales
Segment Reporting Information [Line Items]
Net Sales	26,504	30,286	83,256	92,680
Foreign Net Sales
Segment Reporting Information [Line Items]
Net Sales	$ 3,883	$ 3,723	$ 11,892	$ 11,782

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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=6880815&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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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration