Banking facilities (Tables)

12 Months Ended

Mar. 31, 2019

Banking and Thrift [Abstract]

General banking facilities

	Amount available				Amount utilized				Amount unutilized				Terms of banking facilities as of
	March 31,				March 31,				March 31,				March 31, 2019
	2018		2019		2018		2019		2018		2019		Interest	Repayment
	$ in thousands				$ in thousands				$ in thousands				rate	terms
Import and export facilities
Combined limit		2,564		2,564		99		445		2,465		2,119
Including sub-limit of:
Notes payable		2,308		2,308		99		—		2,209		2,308	HIBOR* +2.5%	Repayable in full within 120 days
Bank overdrafts		641		641		—		—		641		641	Prime rate +1%	Repayable on demand
Long term loans (1)		641		641		—		445		641		196	HIBOR* +2%	Term loans repayable monthly over 3 years.
Other facilities
Export documentary credits		641		641		—		—		641		641
Short term loans		1,923		1,923		—		—		1,923		1,923	HIBOR* +2.25%	Revolving loan repayable in 30 days
		5,128		5,128		99		445		5,029		4,683

Short-term borrowings

	During the fiscal year ended March 31,
	2018			2019
Bank overdrafts		6.00	%		6.00	%
Notes payable		3.42	%		4.18	%
Term loans in Hong Kong		2.69	%		3.45	%