v3.26.1
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