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Condensed Financial Information of Deswell Industries, Inc. - Schedule of Condensed Income Statement (Details) - Parent Company [Member] - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Schedule of Condensed Income Statement [Line Items]      
Equity in earnings of subsidiaries $ 11,854 $ 8,229 $ 2,488
Operating expenses 716 520 429
Income before income taxes 11,138 7,709 2,059
Income taxes
Net income attribute to Deswell Industries, Inc. 11,138 7,709 2,059
Share of other comprehensive income of subsidiaries
Total comprehensive income attributable to Deswell Industries, Inc. $ 11,138 $ 7,709 $ 2,059