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Summary of Significant Accounting Policies - Schedule of Disaggregates Product Sales by Business Segment and by Geography (Details) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2026 | Mar. 31, 2025 | Mar. 31, 2024
Schedule of Disaggregates Product Sales by Business Segment and by Geography [Line Items] |  |  |
Total net sales | $ 61,332 | $ 67,610 | $ 69,368
Injection Molded Plastic Parts [Member] |  |  |
Schedule of Disaggregates Product Sales by Business Segment and by Geography [Line Items] |  |  |
Total net sales | 8,947 | 11,206 | 12,392
Electronic Products [Member] |  |  |
Schedule of Disaggregates Product Sales by Business Segment and by Geography [Line Items] |  |  |
Total net sales | 52,385 | 56,404 | 56,976
United States of America [Member] |  |  |
Schedule of Disaggregates Product Sales by Business Segment and by Geography [Line Items] |  |  |
Total net sales | 7,554 | 6,081 | 7,925
United States of America [Member] | Injection Molded Plastic Parts [Member] |  |  |
Schedule of Disaggregates Product Sales by Business Segment and by Geography [Line Items] |  |  |
Total net sales | 1,195 | 967 | 1,083
United States of America [Member] | Electronic Products [Member] |  |  |
Schedule of Disaggregates Product Sales by Business Segment and by Geography [Line Items] |  |  |
Total net sales | 6,359 | 5,114 | 6,842
PRC [Member] |  |  |
Schedule of Disaggregates Product Sales by Business Segment and by Geography [Line Items] |  |  |
Total net sales | 18,314 | 22,448 | 22,121
PRC [Member] | Injection Molded Plastic Parts [Member] |  |  |
Schedule of Disaggregates Product Sales by Business Segment and by Geography [Line Items] |  |  |
Total net sales | 7,292 | 9,279 | 8,202
PRC [Member] | Electronic Products [Member] |  |  |
Schedule of Disaggregates Product Sales by Business Segment and by Geography [Line Items] |  |  |
Total net sales | 11,022 | 13,169 | 13,919
United Kingdom [Member] |  |  |
Schedule of Disaggregates Product Sales by Business Segment and by Geography [Line Items] |  |  |
Total net sales | 10,453 | 10,917 | 11,985
United Kingdom [Member] | Injection Molded Plastic Parts [Member] |  |  |
Schedule of Disaggregates Product Sales by Business Segment and by Geography [Line Items] |  |  |
Total net sales | 4 | 24 | 12
United Kingdom [Member] | Electronic Products [Member] |  |  |
Schedule of Disaggregates Product Sales by Business Segment and by Geography [Line Items] |  |  |
Total net sales | 10,449 | 10,893 | 11,973
Hong Kong [Member] |  |  |
Schedule of Disaggregates Product Sales by Business Segment and by Geography [Line Items] |  |  |
Total net sales | 6,385 | 6,908 | 8,225
Hong Kong [Member] | Injection Molded Plastic Parts [Member] |  |  |
Schedule of Disaggregates Product Sales by Business Segment and by Geography [Line Items] |  |  |
Total net sales | 405 | 883 | 3,031
Hong Kong [Member] | Electronic Products [Member] |  |  |
Schedule of Disaggregates Product Sales by Business Segment and by Geography [Line Items] |  |  |
Total net sales | 5,980 | 6,025 | 5,194
Europe [Member] |  |  |
Schedule of Disaggregates Product Sales by Business Segment and by Geography [Line Items] |  |  |
Total net sales | 9,286 | 12,546 | 10,016
Europe [Member] | Injection Molded Plastic Parts [Member] |  |  |
Schedule of Disaggregates Product Sales by Business Segment and by Geography [Line Items] |  |  |
Total net sales | 32 | 44 | 53
Europe [Member] | Electronic Products [Member] |  |  |
Schedule of Disaggregates Product Sales by Business Segment and by Geography [Line Items] |  |  |
Total net sales | 9,254 | 12,502 | 9,963
Canada [Member] |  |  |
Schedule of Disaggregates Product Sales by Business Segment and by Geography [Line Items] |  |  |
Total net sales | 5,086 | 3,882 | 2,988
Canada [Member] | Injection Molded Plastic Parts [Member] |  |  |
Schedule of Disaggregates Product Sales by Business Segment and by Geography [Line Items] |  |  |
Total net sales |  |  |
Canada [Member] | Electronic Products [Member] |  |  |
Schedule of Disaggregates Product Sales by Business Segment and by Geography [Line Items] |  |  |
Total net sales | 5,086 | 3,882 | 2,988
Others [Member] |  |  |
Schedule of Disaggregates Product Sales by Business Segment and by Geography [Line Items] |  |  |
Total net sales | 4,254 | 4,828 | 6,108
Others [Member] | Injection Molded Plastic Parts [Member] |  |  |
Schedule of Disaggregates Product Sales by Business Segment and by Geography [Line Items] |  |  |
Total net sales |  | 9 | 11
Others [Member] | Electronic Products [Member] |  |  |
Schedule of Disaggregates Product Sales by Business Segment and by Geography [Line Items] |  |  |
Total net sales | $ 4,235 | $ 4,819 | $ 6,097

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