Income tax (Tables)

12 Months Ended

Mar. 31, 2015

Income Tax Disclosure [Abstract]

Loss before income tax

	2013		2014		2015
	$ in thousands		$ in thousands		$ in thousands
Hong Kong	(3,509	)	(1,495	)	(55	)
PRC	2,832		1,337		148
Others	(48	)	(63	)	(20	)
Total	(725	)	(221	)	73

Deferred taxes

	2013		2014	2015
	$ in thousands		$ in thousands	$ in thousands
Deferred income tax	2		—	—
Current income tax expense	(31	)	—	(13	)
Income tax credit	—		—	1,050
Total income tax (expense) / credit	(29	)	—	1,037

Geographic tax expense

	2013		2014	2015
	$ in thousands		$ in thousands	$ in thousands
Hong Kong	(29	)	—	1,050
PRC	—		—	(13	)
Others	—		—	—
Total	(29	)	—	1,037

Income tax liabilities

	2014	2015
	$ in thousands	$ in thousands
Non-current	2,595	—
Current	7	7
Total	2,602	7

Deferred tax assets and liabilities

	Year ended March 31,
	2013				2014				2015
	$ in thousands		%		$ in thousands		%		$ in thousands		%
United States		23,804		78		25,203		81		21,271		73
Germany		5,121		17		4,688		15		6,210		22
		28,925		95		29,891		96		27,481		95

Changes in valuation allowance

	2013		2014	2015
	$ in thousands		$ in thousands	$ in thousands
Balance, April 1	784		700	853
(Credited) / charged to income tax expense	(84	)	153	3,606
	──────		──────	──────
Balance, March 31	700		853	4,459
	══════		══════	══════

Tax expense attributable to earnings

	2013		2014		2015
	$ in thousands		$ in thousands		$ in thousands
(Loss) / income before income taxes	(725	)	(221	)	73
Income tax benefit / (expense) on pretax income at statutory rate	120		36		(12	)
Effect of different tax rates of subsidiary operating in other jurisdictions	(249	)	(28	)	(233	)
Profit not subject to income tax	3,600		1,129		542
Expenses not deductible for income tax purposes	(3,469	)	(1,137	)	(336	)
(Decrease) / increase in valuation allowance	(84	)	153		3,606
Reversal of provision from conclusion of tax review with tax authorities	—		—		2,595
Tax expense from conclusion of tax review with tax authorities	—		—		(1,545	)
Under provision of prior year	(31	)	—		—
Utilization of tax losses not previously recognized / (tax losses  not yet recognized)	84		(153	)	(3,580	)
Total income tax (expense) / credit	(29	)	—		1,037