Income tax (Tables)

12 Months Ended

Mar. 31, 2018

Income Tax Disclosure [Abstract]

Loss before income tax

	2016			2017		2018
	$ in thousands			$ in thousands		$ in thousands
Hong Kong		3,933			693		221
PRC		(167	)		2,531		(406	)
Others		(585	)		171		189
Total		3,181			3,395		4

Deferred taxes

	2016			2017			2018
	$ in thousands			$ in thousands			$ in thousands
Current income tax expense		(310	)		(600	)		-

Geographic tax expense

	2016			2017			2018
	$ in thousands			$ in thousands			$ in thousands
Hong Kong		(310	)		(5	)		-
PRC		-			(595	)		-
Total		(310	)		(600	)		-

Income tax liabilities

	2017		2018
	$ in thousands		$ in thousands
Current income tax liabilities / (recoverable)		533		(5	)

Deferred tax assets and liabilities

	Year ended March 31,
	2016				2017				2018
	$ in thousands		%		$ in thousands		%		$ in thousands		%
United States		14,062		55		10,356		55		4,807		42
Germany		4,568		18		2,797		15		3,621		31
The PRC		2,737		11		1,590		8		2,054		18
Netherlands		1,901		8		2,299		12		87		1
		23,268		92		17,042		90		10,569		92

Changes in valuation allowance

	2016		2017			2018
	$ in thousands		$ in thousands			$ in thousands
Balance, April 1		4,459		4,459			4,270
(Credited) / charged to income tax expense		-		(189	)		337
Balance, March 31		4,459		4,270			4,607

Tax expense attributable to earnings

	2016			2017			2018
	$ in thousands			$ in thousands			$ in thousands
Income before income taxes		3,181			3,395			4
Income tax expense on pretax income at statutory rate		(525	)		(560	)		(1	)
Effect of different tax rates of subsidiaries operating in other jurisdictions		(95	)		(52	)		128
Profit not subject to income tax		387			472			61
Expenses not deductible for income tax purposes		(255	)		(686	)		(167	)
(Decrease) / increase in valuation allowance		-			(189	)		337
Under provision in prior year		-			5			-
Utilization of tax losses / (tax losses recognized)		178			410			(358	)
Total income tax expense		(310	)		(600	)		-