Business segment information (Tables)

12 Months Ended

Mar. 31, 2020

Accounting Policies [Abstract]

Percentage of net sales

The following table sets forth the percentage of net sales for each of the product lines mentioned above for the fiscal years ended March 31, 2018, 2019, and 2020:

	Year ended March 31,
Product Line	2018			2019			2020
Scales and Others		68	%		67	%		45	%
Pet Electronics Products		16	%		14	%		48	%
Rental and Management		16	%		19	%		7	%
Total		100	%		100	%		100	%

Business segment financial information

(a) Summarized financial information by business segment as of March 31, 2018, 2019 and 2020 is as follows:

	Net sales		Costs of Revenue		Operating income / (loss)			Identifiable assets as of March 31		Depreciation and amortization		Capital expenditure
	$ in thousands		$ in thousands		$ in thousands			$ in thousands		$ in thousands		$ in thousands
2018
Scales and Others		7,862		4,809		208			8,211		479		79
Pet Electronics Products		1,861		1,139		49			1,944		113		19
Rental and Management		1,800		1,010		(19	)		5,622		784		266
Total operating segments		11,523		6,958		238			15,777		1,376		364
Corporate		—		—		—			8,978		—		—
Group		11,523		6,958		238			24,755		1,376		364

2019
Scales and Others	6,686	4,340	(74	)	8,244	540	236
Pet Electronics Products	1,410	915	(16	)	1,739	115	67
Rental and Management	1,896	780	(450	)	4,716	479	289
Total operating segments	9,992	6,035	(540	)	14,699	1,134	592
Corporate	—	—	—		7,787	—	—
Group	9,992	6,035	(540	)	22,486	1,134	592

2020
Scales and Others	5,936	3,194	548		5,026	294	543
Pet Electronics Products	6,259	1,757	767		5,298	310	572
Rental and Management	901	739	(953	)	4,026	442	9
Total operating segments	13,096	5,690	362		14,350	1,046	1,124
Corporate	—	—	—		9,851	—	—
Group	13,096	5,690	362		24,201	1,046	1,124

Total property plant and equipment

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

	March 31,		March 31,
	2019		2020
		$ in thousands		$ in thousands
Hong Kong		845		797
The PRC		8,746		8,642
Property, plant and equipment, net		9,591		9,439

Geographic net export sales

(c) The following is a summary of net revenue by geographical areas constituting 10% or more of total revenue of the Company for the years ended March 31, 2018, 2019 and 2020:

	Year ended March 31,
	2018				2019				2020
	$ in thousands		%		$ in thousands		%		$ in thousands		%
United States		4,807		42		3,184		32		7,453		57
Germany		3,621		31		3,760		38		3,613		28
The PRC		2,054		18		2,265		23		1,288		10
		10,482		91		9,209		93		12,354		95

Customer geographic net export sales

(d) The following is a summary of net revenue by customers constituting 10% or more of total revenue of the Company for the years ended March 31, 2018, 2019 and 2020:

		Year Ended March 31,
		2018				2019				2020
Customers	Segment	$ in thousands		%		$ in thousands		%		$ in thousands		%
Customer A	Scales		3,579		31		3,715		37		3,573		27
Customer C	Scales		1,599		14		1,225		12		1,239		9
Customer B	Scales and Pet Electronics Products		1,662		14		1,027		10		313		2
Customer E	Rental and Management		1,050		9		996		10		—		—
Customer D	Scales		1,115		10		21		—		—		—
			9,005		78		6,984		69		5,125		38