Available-for-Sale Investments (Tables)

12 Months Ended

Mar. 31, 2014

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 as of March 31, 2014 and 2013:

	Cost				Net unrealized gains				Fair values
	2014 US$		2013 US$		2014 US$		2013 US$		2014 US$		2013 US$
Current assets:
Unlisted investments		1,000,000		—		50,500		—		1,050,500		—
Listed equity securities		—		3,138		—		14,015		—		17,153
		1,000,000		3,138		50,500		14,015		1,050,500		17,153
Non-current assets:
Unlisted investments		—		1,000,000		—		45,200		—		1,045,200
		1,000,000		1,003,138		50,500		59,215		1,050,500		1,062,353