Concentrations of Risk - Additional Information (Detail) - USD ($)	Nov. 30, 2015	Feb. 28, 2015	Nov. 30, 2014	Feb. 28, 2014
Concentration Risk [Line Items]
Minimum Insurance available to depositors under the FDIC's general deposit insurance rules	$ 250,000
Cash balances not federally insured	10,500,000
Cash in bank accounts	13,710,000	$ 15,346,000	$ 14,668,000	$ 5,316,000
Canada [Member]
Concentration Risk [Line Items]
Cash in bank accounts	600,000
Mexico [Member]
Concentration Risk [Line Items]
Cash in bank accounts	$ 1,900,000