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Warranty Provision - Additional Information (Detail) (USD $)	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2010
Guarantees [Abstract]
Warranty provisions accrued liabilities	$ 403,627	$ 729,528	$ 296,410	$ 180,151

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

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