Joint Venture - Additional Information (Detail) (USD $)	12 Months Ended
	Feb. 28, 2013	Feb. 29, 2012	Feb. 28, 2011
Schedule of Equity Method Investments [Line Items]
Net income under equity method investments	$ 270,000	$ 503,000	$ 491,000
Cash dividends received	501,000	586,000	763,000
Tekno
Schedule of Equity Method Investments [Line Items]
Net sales	3,100,000	4,600,000	4,500,000
Net income	$ 500,000	$ 1,000,000	$ 1,000,000
Percentage of outstanding equity in a joint venture partnership with Tekno S.A. ("Tekno")	51.00%
Percentage of voting rights in a joint venture partnership with Tekno S.A. ("Tekno")	50.00%