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Concentrations of Risk - Additional Information (Detail) (USD $)	May 31, 2013	Feb. 28, 2013	May 31, 2012	Feb. 28, 2012
Concentration Risk [Line Items]
Minimum Insurance available to depositors under the FDIC's general deposit insurance rules	$ 250,000
Cash balances not federally insured	12,400,000
Cash in bank accounts	14,396,000	6,232,000	14,967,000	10,410,000
CANADA
Concentration Risk [Line Items]
Cash in bank accounts	600,000
MEXICO
Concentration Risk [Line Items]
Cash in bank accounts	$ 800,000

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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