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Accounts and Bills Receivable - Schedule for Allowance for Doubtful Accounts (Detail) (USD $)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Allowance for doubtful accounts:
Balance at beginning of fiscal year		$ 768	$ 115,024
Additions			768
Amount written-off as uncollectible during the fiscal year		(768)	(115,024)
Balance at end of fiscal year			$ 768

Amount of the current period expense charged against operations, the offset which is generally to the allowance for doubtful accounts for the purpose of reducing receivables, including notes receivable, to an amount that approximates their net realizable value (the amount expected to be collected).

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