Summary of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Aug. 31, 2012	Feb. 29, 2012
Summary of significant accounting policies (Textual)
Allowance for doubtful accounts (in dollars)	$ 2	$ 95
Description of inventory valuation policy for Raw material /Work in process	All material purchased, processed, and/or used in the last two fiscal years is valued at the lower of its acquisition cost or market. All material not purchased/used in the last two fiscal years is fully reserved for.
Treasury bills [Member]
Summary of significant accounting policies (Textual)
Maturitiy term	One year or less
Certificates of deposit [Member]
Summary of significant accounting policies (Textual)
Maturitiy term	One to three years