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Segment Information (Schedule of Segment Asset Information) (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Segment Reporting, Other Significant Reconciling Item [Line Items]
Capital expenditure	$ 591	$ 890	$ 853
Depreciation and amortization	2,373	2,824	3,621
Electronic Products [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Identifiable assets	20,043	22,610	25,911
Capital expenditure	167	340	648
Depreciation and amortization	404	415	399
Metallic Parts [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Identifiable assets			397
Capital expenditure			5
Depreciation and amortization		25	41
Injection Molded Plastic Parts [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Identifiable assets	67,528	73,829	74,328
Capital expenditure	424	550	200
Depreciation and amortization	1,969	2,384	3,181
Segment Total [Member]
Segment Reporting, Other Significant Reconciling Item [Line Items]
Identifiable assets	87,571	96,439	100,636
Capital expenditure	591	890	853
Depreciation and amortization	$ 2,373	$ 2,824	$ 3,621

X

- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

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X

- Definition

Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 41
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68060357&loc=d3e9038-108599

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X

- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Details

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X

- Details

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