Intangible assets (Tables)

12 Months Ended

Mar. 31, 2017

Goodwill and Intangible Assets Disclosure [Abstract]

Other intangible assets

	March 31,
	2016			2017
	$ in thousands			$ in thousands
Cost		6,159			5,740
Less: accumulated amortization		(2,867	)		(2,955	)
		3,292			2,785

Components of other intangible assets

	March 31,
	2016		2017
	$ in thousands		$ in thousands
Land use right of factory land in Shenzhen, Guangdong, PRC		1,599		1.326
Land use right of factory land in Xinxing, Guangdong, PRC		1,652		1,459
Golf club membership		41		-
		3,292		2,785

Schedule of amortization expenses

Year ending March 31,	$ in thousands
2018		265
2019		265
2020		265
2021		265
2022		265
Thereafter		1,460
Total		2,785