Income tax (Tables)

12 Months Ended

Mar. 31, 2017

Income Tax Disclosure [Abstract]

Loss before income tax

	2015			2016			2017
	$ in thousands			$ in thousands			$ in thousands
Hong Kong		(55	)		3,933			693
PRC		148			(167	)		2,531
Others		(20	)		(585	)		171
Total		73			3,181			3,395

Deferred taxes

	2015			2016			2017
	$ in thousands			$ in thousands			$ in thousands
Current income tax expense		(13	)		(310	)		(600	)
Income tax credit		1,050			-			-
Total income tax credit / (expense)		1,037			(310	)		(600	)

Geographic tax expense

	2015			2016			2017
	$ in thousands			$ in thousands			$ in thousands
Hong Kong		1,050			(310	)		(5	)
PRC		(13	)		-			(595	)
Total		1,037			(310	)		(600	)

Income tax liabilities

	2016		2017
	$ in thousands		$ in thousands
Non-current		-		-
Current		317		533
Total		317		533

Deferred tax assets and liabilities

Total property, plant and equipment, net by geographical areas are as follows:

	March 31,		March 31,
	2016		2017
	$ in thousands		$ in thousands
Hong Kong		1,159		1,126
The PRC		10,558		9,168
Total property, plant and equipment		11,717		10,294

 (c) The following is a summary of net export sales by geographical areas, which are defined by the final shipment destination, constituting 10% or more of total sales of the Company for the years ended March 31, 2015, 2016 and 2017:

	Year ended March 31,
	2015				2016				2017
	$ in thousands		%		$ in thousands		%		$ in thousands		%
United States		21,271		73		14,062		59		10,356		59
Germany		6,210		22		4,568		19		2,797		16
Netherlands		0		0		1,901		8		2,299		13
		27,481		95		20,531		86		15,452		88

Changes in valuation allowance

	2015		2016		2017
	$ in thousands		$ in thousands		$ in thousands
Balance, April 1		853		4,459		4,459
Charged / (credited) to income tax expense		3,606		-		(189	)
Balance, March 31		4,459		4,459		4,270

Tax expense attributable to earnings

	2015			2016			2017
	$ in thousands			$ in thousands			$ in thousands
Income before income taxes		73			3,181			3,395
Income tax benefit / (expense) on pretax income at statutory rate		(12	)		(525	)		(560	)
Effect of different tax rates of subsidiaries operating in other jurisdictions		(233	)		(95	)		(52	)
Profit not subject to income tax		542			387			472
Expenses not deductible for income tax purposes		(336	)		(255	)		(686	)
Increase / (decrease) in valuation allowance		3,606			-			(189	)
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 in prior year		-			-			5
Utilization of tax losses / (tax losses recognized)		(3,580	)		178			410
Total income tax credit / (expense)		1,037			(310	)		(600	)