Banking facilities (Details 1)	Mar. 31, 2019	Mar. 31, 2018
Banking Facilities Details 2
Weighted average interest rate bank overdrafts	6.00%	6.00%
Weighted average interest rate notes payable	4.18%	3.42%
Term loan in Hong Kong	3.45%	2.69%

Weighted average interest rate of short-term debt outstanding calculated at point in time.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant