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Segment Information (Schedule of Segment Interest Income and Expense) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Mar. 31, 2014
Segment Reporting Information [Line Items] |  |  |
Interest income | $ 372 | $ 535 | $ 596
Interest expenses |  |  |
Injection Molded Plastic Parts [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Interest income | 364 | 509 | 495
Interest expenses |  |  |
Electronic Products [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Interest income | 8 | 26 | 101
Interest expenses |  |  |
Metallic Parts [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Interest income |  |  |
Interest expenses |  |  |

X
- Definition Amount of the cost of borrowed funds accounted for as interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition Interest income derived from funds deposited with both domestic and foreign financial institutions including funds in money market and other accounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.4) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- 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. + Details
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- Details
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