Business segment information (Tables)

12 Months Ended

Mar. 31, 2021

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, 2019, 2020, and 2021:

	Year ended March 31,
Product Line	2019			2020			2021
Scales and Others		67	%		45	%		42	%
Pet Electronics Products		14	%		48	%		51	%
Rental and Management		19	%		7	%		7	%
Total		100	%		100	%		100	%

Business segment financial information

Summarized financial information by business segment as of March 31, 2019, 2020 and 2021 is as follows:

	Net sales		Cost 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
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	325	543
Pet Electronics Products	6,259	1,757	767		5,298	343	572
Rental and Management	901	739	(953	)	4,026	437	9
Total operating segments	13,096	5,690	362		14,350	1,105	1,124
Corporate	—	—	—		9,851	—	—
Group	13,096	5,690	362		24,201	1,105	1,124
2021
Scales and Others	6,555	2,283	1,010		4,591	285	142
Pet Electronics Products	8,002	2,834	1,118		5,700	354	176
Rental and Management	1,033	823	(922	)	4,096	442	382
Total operating segments	15,590	5,940	1,206		14,387	1,081	700
Corporate	—	—	—		11,255	—	—
Group	15,590	5,940	1,206		25,642	1,081	700

Total property plant and equipment

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

	March 31,		March 31,
	2020		2021
		$ in thousands		$ in thousands
Hong Kong		797		750
The PRC		8,642		8,750
Property, plant and equipment, net		9,439		9,500

Geographic net export sales

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, 2019, 2020 and 2021:

	Year ended March 31,
	2019				2020				2021
	$ in thousands		%		$ in thousands		%		$ in thousands		%
United States		3,184		32		7,453		57		9,732		62
Germany		3,760		38		3,613		28		3,666		24
The PRC		2,265		23		1,288		10		1,403		9
		9,209		93		12,354		95		14,801		95

Customer geographic net export sales

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, 2019, 2020 and 2021:

		Year Ended March 31,
		2019				2020				2021
Customers	Segment	$ in thousands		%		$ in thousands		%		$ in thousands		%
Customer A	Scales		3,715		37		3,573		27		3,633		23
Customer C	Scales		1,225		12		1,239		9		1,386		9
Customer B	Scales and Pet Electronics Products		1,027		10		313		2		619		4
Customer E	Rental and Management		996		10		—		—		—		—
			───────		───		───────		───		───────		───
			6,963		69		5,125		38		5,638		36
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