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Condensed Financial Information of Deswell Industries, Inc. - Schedule of Condensed Cash Flow Statement (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2026 | Mar. 31, 2025 | Mar. 31, 2024
Cash flows from operating activities |  |  |
Net income | $ 10,627 | $ 11,138 | $ 7,709
Changes in operating assets and liabilities: |  |  |
Prepaid expenses and other current assets | 237 | (384) | (79)
Other accrued liabilities | 2 | (222) | (753)
Net cash (used in) provided by operating activities | 5,195 | 13,534 | 13,208
Cash flows from investing activities |  |  |
Net cash provided by investing activities | (6,909) | 2,037 | (16,430)
Cash flows from financing activities |  |  |
Dividends paid | (3,188) | (3,188) | (3,188)
Net cash used in financing activities | (3,357) | (3,188) | (3,188)
Cash and cash equivalents, beginning of year | 28,133 | 15,750 | 22,160
Cash and cash equivalents, end of year | 23,062 | 28,133 | 15,750
Parent Company [Member] |  |  |
Cash flows from operating activities |  |  |
Net income | 10,627 | 11,138 | 7,709
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Equity in earnings of subsidiaries | (11,357) | (11,854) | (8,229)
Changes in operating assets and liabilities: |  |  |
Prepaid expenses and other current assets | (1) | (3) | (2)
Amounts due from subsidiaries | 857 | 960 | 252
Other accrued liabilities | (97) | (233) | (444)
Net cash (used in) provided by operating activities | 29 | 8 | (714)
Cash flows from investing activities |  |  |
Dividends received from subsidiary | 3,188 | 3,188 | 3,188
Net cash provided by investing activities | 3,188 | 3,188 | 3,188
Cash flows from financing activities |  |  |
Dividends paid | (3,188) | (3,188) | (3,188)
Repurchase of treasury stock | (169) |  |
Net cash used in financing activities | (3,357) | (3,188) | (3,188)
Net (decrease) increase in cash and cash equivalents | (140) | 8 | (714)
Cash and cash equivalents, beginning of year | 212 | 204 | 918
Cash and cash equivalents, end of year | $ 72 | $ 212 | $ 204

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