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Employee retirement benefits and severance payment allowance (Details Narrative) (USD $)	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Employee Retirement Benefits And Severance Payment Allowance Details Narrative
Contributions to mandatory Hong Kong retirement plan	$ 225,000	$ 239,000	$ 318,000
Mandatory severance pay allowance	$ 743,000	$ 841,000

Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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