Available-for-Sale Investments (Tables)

12 Months Ended

Mar. 31, 2013

Investments Debt And Equity Securities [Abstract]

Summary of Available-for-Sale Debt and Equity Securities

The following is a summary of available-for-sale debt and equity securities, which are all non-restricted, as of March 31, 2013 and 2012:

	Cost				Net unrealized gains				Fair values
	2013 US$		2012 US$		2013 US$		2012 US$		2013 US$		2012 US$
Current assets:
Unlisted investments		—		2,000,000		—		—		—		2,000,000
Listed equity securities		3,138		3,138		14,015		2,928		17,153		6,066
		3,138		2,003,138		14,015		2,928		17,153		2,006,066
Non-current assets:
Unlisted investments		1,000,000		1,000,000		45,200		33,800		1,045,200		1,033,800
		1,003,138		3,003,138		59,215		36,728		1,062,353		3,039,866