Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)	12 Months Ended
	Feb. 28, 2013	Feb. 29, 2012	Feb. 28, 2011	Feb. 28, 2010
Significant Accounting Policies [Line Items]
Cash and cash equivalent	$ 37,508,000	$ 28,201,000	$ 35,629,000	$ 12,866,000
Receivables, Reserves	489,000	696,000
Inventory at outside processors	5,300,000	2,700,000
Inventory valuation reserves	1,200,000	1,200,000
Research and product development expenses	4,100,000	3,900,000	2,300,000
Compensation expenses	600,000	300,000	200,000
U.S. Treasury bills
Significant Accounting Policies [Line Items]
Cash and cash equivalent	$ 30,000,000
2012 Plan
Significant Accounting Policies [Line Items]
Number of active equity award plan	1
Tekno
Significant Accounting Policies [Line Items]
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%
Building and Building Improvements | Minimum
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	5 years
Building and Building Improvements | Maximum
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	20 years
Operating Equipment | Minimum
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	5 years
Operating Equipment | Maximum
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	20 years
Furniture and Fixtures | Minimum
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	5 years
Furniture and Fixtures | Maximum
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	10 years
Software
Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	5 years
Leasehold Improvements
Significant Accounting Policies [Line Items]
Leasehold improvements, amortization period	Lesser of their expected useful life or the remaining life of the lease.