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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Mar. 31, 2026
Summary of Significant Accounting Policies [Abstract] |
Schedule of Estimated Useful Lives of Property, Plant and Equipment | Depreciation and amortization are provided on the straight line method based on the estimated useful lives of the assets as follows:
Leasehold land and buildings |  | 30 – 50 years
Plant and machinery |  | 5 – 15 years
Furniture, fixtures and equipment |  | 4 – 5 years
Motor vehicles |  | 3 – 5 years
Leasehold improvements |  | Shorter of lease term or 2 – 5 years
Schedule of Disaggregates Product Sales by Business Segment and by Geography | The following table disaggregates product sales by business segment and by geography, which provides information as to the major source of revenue. See Note 16 for additional description of our reportable business segments.
|  | Year ended March 31, 2024 |
|  | Injection molded Plastic parts |  |  | Electronic Products |  |  | Total |
Net sales |  |  |  |  |  |  |  |  |
United States of America |  | $ | 1,083 |  |  | $ | 6,842 |  |  | $ | 7,925 |
PRC |  |  | 8,202 |  |  |  | 13,919 |  |  |  | 22,121 |
United Kingdom |  |  | 12 |  |  |  | 11,973 |  |  |  | 11,985 |
Hong Kong |  |  | 3,031 |  |  |  | 5,194 |  |  |  | 8,225 |
Europe |  |  | 53 |  |  |  | 9,963 |  |  |  | 10,016 |
Canada |  |  | — |  |  |  | 2,988 |  |  |  | 2,988 |
Others |  |  | 11 |  |  |  | 6,097 |  |  |  | 6,108 |
Total net sales |  | $ | 12,392 |  |  | $ | 56,976 |  |  | $ | 69,368 |
|  | Year ended March 31, 2025 |
|  | Injection molded Plastic parts |  |  | Electronic Products |  |  | Total |
Net sales |  |  |  |  |  |  |  |  |
United States of America |  | $ | 967 |  |  | $ | 5,114 |  |  | $ | 6,081 |
PRC |  |  | 9,279 |  |  |  | 13,169 |  |  |  | 22,448 |
United Kingdom |  |  | 24 |  |  |  | 10,893 |  |  |  | 10,917 |
Hong Kong |  |  | 883 |  |  |  | 6,025 |  |  |  | 6,908 |
Europe |  |  | 44 |  |  |  | 12,502 |  |  |  | 12,546 |
Canada |  |  | — |  |  |  | 3,882 |  |  |  | 3,882 |
Others |  |  | 9 |  |  |  | 4,819 |  |  |  | 4,828 |
Total net sales |  | $ | 11,206 |  |  | $ | 56,404 |  |  | $ | 67,610 |
|  | Year ended March 31, 2026 |
|  | Injection molded Plastic parts |  |  | Electronic Products |  |  | Total |
Net sales |  |  |  |  |  |  |  |  |
United States of America |  | $ | 1,195 |  |  | $ | 6,359 |  |  | $ | 7,554 |
PRC |  |  | 7,292 |  |  |  | 11,022 |  |  |  | 18,314 |
United Kingdom |  |  | 4 |  |  |  | 10,449 |  |  |  | 10,453 |
Hong Kong |  |  | 405 |  |  |  | 5,980 |  |  |  | 6,385 |
Europe |  |  | 32 |  |  |  | 9,254 |  |  |  | 9,286 |
Canada |  |  | — |  |  |  | 5,086 |  |  |  | 5,086 |
Others |  |  | 19 |  |  |  | 4,235 |  |  |  | 4,254 |
Total net sales |  | $ | 8,947 |  |  | $ | 52,385 |  |  | $ | 61,332 |
Schedule of Accounts Receivable, Net | Accounts receivable, net, as of March 31, 2025 and 2026 consisted of the following:
|  | March 31, |
|  | 2025 |  |  | 2026 |
Accounts receivable |  | $ | 9,938 |  |  | $ | 11,455 |
Less: Allowance for credit losses |  |  | (24 | ) |  |  | (22 | )
Accounts receivable, net |  | $ | 9,914 |  |  | $ | 11,433 |
Schedule of Allowance for Credit Losses | The movement of allowance for credit losses for the years ended March 31, 2024, 2025 and 2026 was as follows:
|  | Year ended March 31, |
Allowance for credit losses |  | 2024 |  |  | 2025 |  |  | 2026 |
Balance at beginning of the year |  | $ | 39 |  |  | $ | 98 |  |  | $ | 24 |
Provision for (reversal of) credit losses, net |  |  | 76 |  |  |  | (67 | ) |  |  | (2 | )
Written off |  |  | (17 | ) |  |  | (7 | ) |  |  | -- |
|  | $ | 98 |  |  | $ | 24 |  |  | $ | 22 |
Schedule of Basic Net Income Per Share and Diluted Net Income Per Share | Basic net income per share and diluted net income per share calculated in accordance with ASC No. 260, “Earnings Per Share”, are reconciled as follows (shares in thousands):
|  | Year ended March 31, |
|  | 2024 |  |  | 2025 |  |  | 2026 |
Net income attributable to Deswell Industries, Inc. |  | $ | 7,709 |  |  | $ | 11,138 |  |  | $ | 10,627 |
Basic weighted average common shares outstanding |  |  | 15,935 |  |  |  | 15,935 |  |  |  | 15,922 |
Basic net income per share |  | $ | 0.48 |  |  | $ | 0.70 |  |  | $ | 0.67 |
|  | Year ended March 31, |
|  | 2024 |  |  | 2025 |  |  | 2026 |
Basic weighted average common shares outstanding |  |  | 15,935 |  |  |  | 15,935 |  |  |  | 15,922 |
Effect of dilutive securities – Options |  |  | 64 |  |  |  | 18 |  |  |  | -- |
Diluted weighted average common and potential common shares outstanding |  |  | 15,999 |  |  |  | 15,953 |  |  |  | 15,922 |
Diluted net income per share |  | $ | 0.48 |  |  | $ | 0.70 |  |  | $ | 0.67 |

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