Accounts and Bills Receivable (Tables)

12 Months Ended

Mar. 31, 2013

Text Block [Abstract]

Summary of Accounts and Bills Receivable

	March 31, 2013		March 31, 2012
	US$		US$
Accounts receivable		9,673,986		13,318,143
Bills receivable		10,039,622		16,954,919
Accounts and bills receivable		19,713,608		30,273,062

Schedule of Allowance for Doubtful Accounts

	Fiscal years ended
	March 31, 2013		March 31, 2012			March 31, 2011
	US$		US$			US$
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