995300 - Document - Cover link:presentationLink link:calculationLink link:definitionLink 995301 - Document - Audit Information link:presentationLink link:calculationLink link:definitionLink 995302 - Statement - CONSOLIDATED BALANCE SHEETS link:presentationLink link:calculationLink link:definitionLink 995303 - Statement - CONSOLIDATED BALANCE SHEETS (Parentheticals) link:presentationLink link:calculationLink link:definitionLink 995304 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME link:presentationLink link:calculationLink link:definitionLink 995305 - Statement - CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ EQUITY link:presentationLink link:calculationLink link:definitionLink 995306 - Statement - CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ EQUITY (Parentheticals) link:presentationLink link:calculationLink link:definitionLink 995307 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS link:presentationLink link:calculationLink link:definitionLink 995308 - Disclosure - Organization and Basis of Financial Statements link:presentationLink link:calculationLink link:definitionLink 995309 - Disclosure - Summary of Significant Accounting Policies link:presentationLink link:calculationLink link:definitionLink 995310 - Disclosure - Marketable Securities link:presentationLink link:calculationLink link:definitionLink 995311 - Disclosure - Inventories, Net link:presentationLink link:calculationLink link:definitionLink 995312 - Disclosure - Prepaid Expenses and Other Current Assets link:presentationLink link:calculationLink link:definitionLink 995313 - Disclosure - Property, Plant and Equipment, Net link:presentationLink link:calculationLink link:definitionLink 995314 - Disclosure - Other Accrued Liabilities link:presentationLink link:calculationLink link:definitionLink 995315 - Disclosure - Income Taxes link:presentationLink link:calculationLink link:definitionLink 995316 - Disclosure - Lease link:presentationLink link:calculationLink link:definitionLink 995317 - Disclosure - Commitments and Contingencies link:presentationLink link:calculationLink link:definitionLink 995318 - Disclosure - Employee Benefits link:presentationLink link:calculationLink link:definitionLink 995319 - Disclosure - Stock Option Plan link:presentationLink link:calculationLink link:definitionLink 995320 - Disclosure - Other Income, Net link:presentationLink link:calculationLink link:definitionLink 995321 - Disclosure - Non-Operating Income, Net link:presentationLink link:calculationLink link:definitionLink 995322 - Disclosure - Operating Risk link:presentationLink link:calculationLink link:definitionLink 995323 - Disclosure - Segment Information link:presentationLink link:calculationLink link:definitionLink 995324 - Disclosure - Condensed Financial Information of Deswell Industries, Inc. link:presentationLink link:calculationLink link:definitionLink 995325 - Disclosure - Cybersecurity Risk Management and Strategy Disclosure link:presentationLink link:calculationLink link:definitionLink 996326 - Disclosure - Summary of Significant Accounting Policies (Policies) link:presentationLink link:calculationLink link:definitionLink 996327 - Disclosure - Summary of Significant Accounting Policies (Tables) link:presentationLink link:calculationLink link:definitionLink 996328 - Disclosure - Marketable Securities (Tables) link:presentationLink link:calculationLink link:definitionLink 996329 - Disclosure - Inventories, Net (Tables) link:presentationLink link:calculationLink link:definitionLink 996330 - Disclosure - Prepaid Expenses and Other Current Assets (Tables) link:presentationLink link:calculationLink link:definitionLink 996331 - Disclosure - Property, Plant and Equipment, Net (Tables) link:presentationLink link:calculationLink link:definitionLink 996332 - Disclosure - Other Accrued Liabilities (Tables) link:presentationLink link:calculationLink link:definitionLink 996333 - Disclosure - Income Taxes (Tables) link:presentationLink link:calculationLink link:definitionLink 996334 - Disclosure - Lease (Tables) link:presentationLink link:calculationLink link:definitionLink 996335 - Disclosure - Stock Option Plan (Tables) link:presentationLink link:calculationLink link:definitionLink 996336 - Disclosure - Other Income, Net (Tables) link:presentationLink link:calculationLink link:definitionLink 996337 - Disclosure - Non-Operating Income, Net (Tables) link:presentationLink link:calculationLink link:definitionLink 996338 - Disclosure - Operating Risk (Tables) link:presentationLink link:calculationLink link:definitionLink 996339 - Disclosure - Segment Information (Tables) link:presentationLink link:calculationLink link:definitionLink 996340 - Disclosure - Condensed Financial Information of Deswell Industries, Inc. (Tables) link:presentationLink link:calculationLink link:definitionLink 996341 - Disclosure - Organization and Basis of Financial Statements (Details) link:presentationLink link:calculationLink link:definitionLink 996342 - Disclosure - Summary of Significant Accounting Policies (Details) link:presentationLink link:calculationLink link:definitionLink 996343 - Disclosure - Summary of Significant Accounting Policies - Schedule of Estimated Useful Lives of Property, Plant and Equipment (Details) link:presentationLink link:calculationLink link:definitionLink 996344 - Disclosure - Summary of Significant Accounting Policies - Schedule of Disaggregates Product Sales by Business Segment and by Geography (Details) link:presentationLink link:calculationLink link:definitionLink 996345 - Disclosure - Summary of Significant Accounting Policies - Schedule of Accounts Receivable, Net (Details) link:presentationLink link:calculationLink link:definitionLink 996346 - Disclosure - Summary of Significant Accounting Policies - Schedule of Allowance for Credit Losses (Details) link:presentationLink link:calculationLink link:definitionLink 996347 - Disclosure - Summary of Significant Accounting Policies - Schedule of Basic Net Income Per Share and Diluted Net Income Per Share (Details) link:presentationLink link:calculationLink link:definitionLink 996348 - Disclosure - Marketable Securities (Details) link:presentationLink link:calculationLink link:definitionLink 996349 - Disclosure - Marketable Securities - Schedule of Company Acquired Equity Securities (Details) link:presentationLink link:calculationLink link:definitionLink 996350 - Disclosure - Inventories, Net - Schedule of Inventories, Net of Allowances (Details) link:presentationLink link:calculationLink link:definitionLink 996351 - Disclosure - Inventories, Net - Schedule of Obsolescence Allowance for Inventory (Details) link:presentationLink link:calculationLink link:definitionLink 996352 - Disclosure - Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Details) link:presentationLink link:calculationLink link:definitionLink 996353 - Disclosure - Property, Plant and Equipment, Net (Details) link:presentationLink link:calculationLink link:definitionLink 996354 - Disclosure - Property, Plant and Equipment, Net - Schedule of Property, Plant and Equipment, Net (Details) link:presentationLink link:calculationLink link:definitionLink 996355 - Disclosure - Property, Plant and Equipment, Net - Schedule of Land Use Rights and Long Term Leased Land (Details) link:presentationLink link:calculationLink link:definitionLink 996356 - Disclosure - Other Accrued Liabilities - Schedule of Other Accrued Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 996357 - Disclosure - Income Taxes (Details) link:presentationLink link:calculationLink link:definitionLink 996358 - Disclosure - Income Taxes - Schedule of Provision for Income Taxes (Details) link:presentationLink link:calculationLink link:definitionLink 996359 - Disclosure - Income Taxes - Schedule of Statutory Tax Rate (Details) link:presentationLink link:calculationLink link:definitionLink 996360 - Disclosure - Income Taxes - Schedule of Statutory Tax Rate (Parentheticals) (Details) link:presentationLink link:calculationLink link:definitionLink 996361 - Disclosure - Income Taxes - Schedule of Cash Payments for Tax Liabilities (Details) link:presentationLink link:calculationLink link:definitionLink 996362 - Disclosure - Income Taxes - Schedule of Net Deferred Income Tax (Details) link:presentationLink link:calculationLink link:definitionLink 996363 - Disclosure - Income Taxes - Schedule of Components of Net Deferred Income Tax (Details) link:presentationLink link:calculationLink link:definitionLink 996364 - Disclosure - Income Taxes - Schedule of Unrecognized Tax Benefits (Details) link:presentationLink link:calculationLink link:definitionLink 996365 - Disclosure - Lease (Details) link:presentationLink link:calculationLink link:definitionLink 996366 - Disclosure - Lease - Schedule of Minimum Future Rental Income (Details) link:presentationLink link:calculationLink link:definitionLink 996367 - Disclosure - Lease - Schedule of Lease (Details) link:presentationLink link:calculationLink link:definitionLink 996368 - Disclosure - Commitments and Contingencies (Details) link:presentationLink link:calculationLink link:definitionLink 996369 - Disclosure - Employee Benefits (Details) link:presentationLink link:calculationLink link:definitionLink 996370 - Disclosure - Stock Option Plan (Details) link:presentationLink link:calculationLink link:definitionLink 996371 - Disclosure - Stock Option Plan - Schedule of Option Activity (Details) link:presentationLink link:calculationLink link:definitionLink 996372 - Disclosure - Other Income, Net - Schedule of Other Income, Net (Details) link:presentationLink link:calculationLink link:definitionLink 996373 - Disclosure - Non-Operating Income, Net - Schedule of Non-Operating Income, Net (Details) link:presentationLink link:calculationLink link:definitionLink 996374 - Disclosure - Operating Risk (Details) link:presentationLink link:calculationLink link:definitionLink 996375 - Disclosure - Operating Risk - Schedule of Operating Risks (Details) link:presentationLink link:calculationLink link:definitionLink 996376 - Disclosure - Segment Information (Details) link:presentationLink link:calculationLink link:definitionLink 996377 - Disclosure - Segment Information - Schedule of Major Activities for Reportable Segments (Details) link:presentationLink link:calculationLink link:definitionLink 996378 - Disclosure - Segment Information - Schedule of Profitability Information for Reportable Segments (Details) link:presentationLink link:calculationLink link:definitionLink 996379 - Disclosure - Segment Information - Schedule of Asset Information for Reportable Segments (Details) link:presentationLink link:calculationLink link:definitionLink 996380 - Disclosure - Segment Information - Schedule of Breakdown of Sales by Destination (Details) link:presentationLink link:calculationLink link:definitionLink 996381 - Disclosure - Segment Information - Schedule of Long-Lived Assets (Details) link:presentationLink link:calculationLink link:definitionLink 996382 - Disclosure - Condensed Financial Information of Deswell Industries, Inc. (Details) link:presentationLink link:calculationLink link:definitionLink 996383 - Disclosure - Condensed Financial Information of Deswell Industries, Inc. - Schedule of Condensed Balance Sheet (Details) link:presentationLink link:calculationLink link:definitionLink 996384 - Disclosure - Condensed Financial Information of Deswell Industries, Inc. - Schedule of Condensed Income Statement (Details) link:presentationLink link:calculationLink link:definitionLink 996385 - Disclosure - Condensed Financial Information of Deswell Industries, Inc. - Schedule of Condensed Cash Flow Statement (Details) link:presentationLink link:calculationLink link:definitionLink