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Commitments and contingencies (Tables)

12 Months Ended

Mar. 31, 2013

Commitments And Contingencies Disclosure [Abstract]

Operating Lease Expenses Included in Determination of Net Income

Operating lease expense that has been included in the determination of the net income is as follows:


	Years ended March 31,
	2011		2012		2013
	US$		US$		US$
Office premises		707,772		778,364		726,893
Residential apartments for employees		128,956		102,725		104,557

Total operating lease expense		836,728		881,089		831,450

Minimum Annual Lease Commitments

The minimum annual lease commitments under the above operating leases that have initial or remaining terms in excess of one year are as follows:


For the year ending March 31,	US$
2014		350,284
2015		217,794
2016		224,328
2017		231,058
2018		278,742

- Definition

Tabular disclosure of a lessee's leasing arrangements including: (1) the basis on which contingent rental payments are determined, (2) the existence and terms of renewal or purchase options and escalation clauses, (3) restrictions imposed by lease arrangements, such as those concerning dividends, additional debt, and further leasing, (4) rent holidays, rent concessions, or leasehold improvement incentives and unusual provisions or conditions. Disclosure may also include the specific period used to amortize material leasehold improvements made at the inception of the lease or during the lease term. Additionally, for operating leases having initial or remaining noncancelable lease terms in excess of one year: (a) future minimum rental payments required as of the date of the latest balance sheet presented, in the aggregate and for each of the five succeeding fiscal years, (b) the total of minimum rentals to be received in the future under noncancelable subleases as of the date of the latest balance sheet presented, and (c) for all operating leases, rental expense for each period for which an income statement is presented, with separate amounts for minimum rentals, contingent rentals, and sublease rentals. Rental payments under leases with terms of a month or less that were not renewed need not be included.

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