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Convertible Note Receivable (Details) (USD $)	12 Months Ended	1 Months Ended	3 Months Ended
Convertible Note Receivable (Details) (USD $)	Jul. 31, 2012	Jan. 31, 2010 BIOSAFE notes	Jan. 31, 2012 BIOSAFE notes	Feb. 28, 2009 BIOSAFE notes
Convertible Note Receivable
Investment at cost (in dollars)		$ 500,000		$ 200,000
Additional investment made (in dollars)		300,000
Accrued interest (in dollars)			105,000
Loss on investment (in dollars)	$ 605,000		$ 605,000

The amount of other than temporary impairment (OTTI) losses on equity securities, OTTI related to credit losses on debt securities, and OTTI losses on debt securities when the entity intends to sell the securities or it is more likely than not that the entity will be required to sell the securities before recovery of its amortized cost basis. Additionally, this item includes OTTI losses recognized during the period on investments accounted for under the cost method of accounting.

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