Concentrations of Risk - Additional Information (Detail) (USD $)	May 31, 2014	Feb. 28, 2014	May 31, 2013	Feb. 28, 2013
Concentration Risk [Line Items]
Minimum Insurance available to depositors under the FDIC's general deposit insurance rules	$ 250,000
Cash balances not federally insured	10,100,000
Cash in bank accounts	13,266,000	5,316,000	14,396,000	6,232,000
Canada [Member]
Concentration Risk [Line Items]
Cash in bank accounts	600,000
Mexico [Member]
Concentration Risk [Line Items]
Cash in bank accounts	$ 1,200,000