Deswell Industries (DSWL) 20-F 9 Aug 24 2024 FY Annual report (foreign) Financial data

Cover

Cover	12 Months Ended
	Mar. 31, 2024 shares
Document Information [Line Items]
Document Type	20-F
Document Registration Statement	false
Document Annual Report	true
Document Transition Report	false
Document Financial Statement Error Correction [Flag]	false
Document Shell Company Report	false
Entity Interactive Data Current	Yes
Document Accounting Standard	U.S. GAAP
ICFR Auditor Attestation Flag	false
Amendment Flag	false
Document Period End Date	Mar. 31, 2024
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	FY
Entity Information [Line Items]
Entity Registrant Name	DESWELL INDUSTRIES, INC.
Entity Central Index Key	0000946936
Entity File Number	001-33900
Entity Incorporation, State or Country Code	D8
Current Fiscal Year End Date	--03-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity Filer Category	Non-accelerated Filer
Entity Emerging Growth Company	false
Entity Contact Personnel [Line Items]
Entity Address, Address Line One	10B, Edificio Associacao Industrial De Macau
Entity Address, Address Line Two	32 Rua do Comandante Mata e Oliveria
Entity Address, City or Town	Macao
Entity Address, Country	CN
Entity Address, Postal Zip Code	0000
Entity Listings [Line Items]
Title of 12(b) Security	Common shares, no par value
Trading Symbol	DSWL
Security Exchange Name	NASDAQ
Entity Common Stock, Shares Outstanding	15,935,239
Business Contact [Member]
Entity Contact Personnel [Line Items]
Contact Personnel Name	Herman Wong
Contact Personnel Email Address	hermanwong@jetcrown.net
Contact Personnel Fax Number	853-28-323265
Entity Address, Address Line One	10B, Edificio Associacao Industrial De macau
Entity Address, Address Line Two	32 Rua do Comandante Mata e Oliveira
Entity Address, City or Town	Macao
Entity Address, Country	CN
Entity Address, Postal Zip Code	0000
Entity Phone Fax Numbers [Line Items]
City Area Code	853
Local Phone Number	-28-322096

Audit Information

Audit Information	12 Months Ended
	Mar. 31, 2024
Auditor [Table]
Auditor Name	BDO China Shu Lun Pan Certified Public Accountants LLP
Auditor Firm ID	1818
Auditor Location	Shenzhen, People’s Republic of China

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 31, 2023
Current assets:
Cash and cash equivalents	$ 15,750	$ 22,160
Time deposits with original maturities over three months	13,979	3,053
Time deposit with original maturities over twelve months – current		1,047
Marketable securities (note 3)	23,026	20,722
Held-to-maturity investment	5,157
Accounts receivable, less allowances for credit losses of $39 and $98 at March 31, 2023 and 2024, respectively (note 2)	11,986	15,704
Inventories, net (note 4)	12,129	17,325
Prepaid expenses and other current assets (note 5)	1,228	1,149
Total current assets	83,255	81,160
Property, plant and equipment, net (note 6)	24,603	26,051
Deferred tax assets (note 8)	419	262
Time deposits with original maturities over twelve months	2,799	2,906
Total assets	111,076	110,379
Current liabilities:
Accounts payable	5,210	6,949
Accrued payroll and employee benefits	7,159	7,943
Customer deposits	1,712	2,216
Other accrued liabilities (note 7)	1,236	1,989
Income taxes payable	1,113	1,149
Total current liabilities	16,430	20,246
Deferred income tax liabilities (note 8)	476	484
Total liabilities	16,906	20,730
Commitments and contingencies (note 10)
Shareholders’ equity:
Common shares nil par value; authorized 30,000,000 shares as of March 31, 2023 and 2024; 17,081,810 and 17,081,810 shares issued as of March 31, 2023 and 2024; 15,935,239 and 15,935,239 shares outstanding as of March 31, 2023 and 2024	53,202	53,202
Treasury stock at cost; 1,146,571 shares as of March 31, 2023 and 2024	(2,821)	(2,821)
Additional paid-in capital	7,973	7,973
Accumulated other comprehensive income	5,316	5,316
Retained earnings	30,500	25,979
Total shareholders’ equity	94,170	89,649
Total liabilities and shareholders’ equity	$ 111,076	$ 110,379

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parentheticals) - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 31, 2023
Statement of Financial Position [Abstract]
Allowances for credit losses (in Dollars)	$ 98	$ 39
Common shares, authorized	30,000,000	30,000,000
Common shares, issued	17,081,810	17,081,810
Common shares, outstanding	15,935,239	15,935,239
Common shares, no par value (in Dollars per share)
Treasury stock, at cost	1,146,571	1,146,571

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Income Statement [Abstract]
Net sales	$ 69,368	$ 77,337	$ 85,980
Cost of sales	55,465	64,498	72,028
Gross profit	13,903	12,839	13,952
Selling, general and administrative expenses	10,501	10,966	11,267
Other income, net (note 13)	383	1,014	74
Operating income	3,785	2,887	2,759
Non-operating income (expenses), net (note 14)	4,034	(573)	5,308
Income before income taxes	7,819	2,314	8,067
Income tax expense (benefit) (note 8)	110	255	(165)
Net income attribute to Deswell Industries, Inc.	7,709	2,059	8,232
Other comprehensive income
Total comprehensive income attributable to Deswell Industries, Inc.	$ 7,709	$ 2,059	$ 8,232
Basic:
Net income per share (in Dollars per share)	$ 0.48	$ 0.13	$ 0.52
Weighted average common shares outstanding (shares in thousands) (in Shares)	15,935	15,935	15,929
Diluted:
Net income per share (in Dollars per share)	$ 0.48	$ 0.13	$ 0.51
Weighted average common shares outstanding (shares in thousands) (in Shares)	15,999	16,072	16,135

CONSOLIDATED STATEMENTS OF SHAR

CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ EQUITY - USD ($) $ in Thousands	Common stock	Treasury Stock	Additional paid-in capital	Accumulated other comprehensive income	Retained earnings	Total
Balance at Mar. 31, 2021	$ 53,143	$ (2,821)	$ 7,989	$ 5,316	$ 22,062	$ 85,689
Balance (in Shares) at Mar. 31, 2021	17,061,810	(1,146,571)
Exercise of stock options	$ 59		(16)			43
Exercise of stock options (in Shares)	20,000
Net income					8,232	8,232
Dividends ($0.2 per share)					(3,186)	(3,186)
Balance at Mar. 31, 2022	$ 53,202	$ (2,821)	7,973	5,316	27,108	90,778
Balance (in Shares) at Mar. 31, 2022	17,081,810	(1,146,571)
Net income					2,059	2,059
Dividends ($0.2 per share)					(3,188)	(3,188)
Balance at Mar. 31, 2023	$ 53,202	$ (2,821)	7,973	5,316	25,979	89,649
Balance (in Shares) at Mar. 31, 2023	17,081,810	(1,146,571)
Net income					7,709	7,709
Dividends ($0.2 per share)					(3,188)	(3,188)
Balance at Mar. 31, 2024	$ 53,202	$ (2,821)	$ 7,973	$ 5,316	$ 30,500	$ 94,170
Balance (in Shares) at Mar. 31, 2024	17,081,810	(1,146,571)

CONSOLIDATED STATEMENTS OF SH_2

CONSOLIDATED STATEMENTS OF SHAREHOLDERS’ EQUITY (Parentheticals) - $ / shares	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Statement of Stockholders' Equity [Abstract]
Dividends	$ 0.2	$ 0.2	$ 0.2

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities
Net income	$ 7,709	$ 2,059	$ 8,232
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,523	1,709	1,736
(Reversal of) provision for credit losses, net	76	(229)	(148)
Allowance for obsolete inventories, net	(24)	116	(25)
Loss (gain) on disposal of property, plant and equipment	74	(18)	24
Unrealized holding loss (gain) on marketable securities	(952)	3,973	(872)
Gain on sales of marketable securities		(581)	(1,073)
Deferred income tax benefit	(165)	(178)	(557)
Exchange loss arising from marketable securities			117
Changes in operating assets and liabilities:
Accounts receivable	3,642	2,720	(3,339)
Inventories	5,220	6,378	(7,601)
Prepaid expenses and other current assets	(79)	777	563
Accounts payable	(1,739)	(2,889)	316
Accrued payroll and employee benefits	(784)	332	504
Customer deposits	(504)	(127)	660
Other accrued liabilities	(753)	(961)	934
Income taxes payable	(36)	(83)	346
Net cash (used in) provided by operating activities	13,208	12,998	(183)
Cash flows from investing activities
Purchase of property, plant and equipment	(381)	(792)	(1,504)
Proceeds from sale of property, plant and equipment, net of transaction costs	232	67	50
Purchase of marketable securities	(1,352)	(3,469)	(11,543)
Proceeds from sales of marketable securities		3,854	11,245
(Increase) decrease of fixed deposits with original maturities over three months	(10,926)	1,301	(1,654)
(Increase) decrease of fixed deposits with original maturities over twelve months	1,154	(2,076)	(26)
Increase in held-to-maturity investment	(5,157)
Net cash used in investing activities	(16,430)	(1,115)	(3,432)
Cash flows from financing activities
Dividends paid	(3,188)	(3,188)	(3,186)
Proceeds from exercise of stock options			43
Net cash used in financing activities	(3,188)	(3,188)	(3,143)
Net (decrease) increase in cash and cash equivalents	(6,410)	8,695	(6,758)
Cash and cash equivalents, beginning of year	22,160	13,465	20,223
Cash and cash equivalents, end of year	15,750	22,160	13,465
Cash paid during the year for:
Interest
Income taxes	$ 227	$ 418	$ 68

Organization and Basis of Finan

Organization and Basis of Financial Statements	12 Months Ended
	Mar. 31, 2024
Organization and Basis of Financial Statements [Abstract]
Organization and Basis of Financial Statements	1. Organization and Basis of Financial Statements Deswell Industries, Inc. was incorporated in the British Virgin Islands on December 2, 1993. The principal activities of the Company comprise the manufacturing and sales of injection -molded As the Company is a holding company, the amount of any dividends to be declared by the Company will be dependent upon the amount which can be distributed from its subsidiaries. Dividends from subsidiaries are declared based on profits as reported in their statutory accounts.

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Mar. 31, 2024
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	2. Summary of Significant Accounting Policies Principles of consolidation Cash and cash equivalents Marketable securities -operating -operating Held -to-maturity investment -to-maturity -operating Inventories -in-progress -moving -moving Property, plant and equipment 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 Leases -of-use liabilities represent the Company’s obligation to make lease payments arising from the lease. Operating lease ROU assets and liabilities are recognized at commencement date based on the present value of lease payments over the lease term. As most of the Company’s leases do not provide an implicit rate, the Company uses its incremental borrowing rate based on the information available at commencement date in determining the present value of lease payments. It uses the implicit rate when readily determinable. The operating lease ROU asset also includes any lease payments made and excludes lease incentives. The Company’s lease terms may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option. Lease expense for lease payments is recognized on a straight -line When the Company is the lessor, minimum contractual rental from leases is recognized on a straight -line -cancelable -line -line -line -line -line Impairment of long -lived assets -lived -lived -lived -lived -term Revenue recognition Products sales The Company recognizes revenue upon transfer of control of its products to the customer, which typically occurs upon delivery of products or when the customer accepts the injection molds. The Company’s main performance obligation to its customers is the delivery of products in accordance with purchase orders. Each purchase order defines the transaction price for the products purchased under the arrangement. Acceptance of delivery of the products and molds is evidenced by goods receipt notes signed by the customer or the mold acceptance form. The Company has no remaining obligations after the customer’s acceptance of the products. Under the terms of the contracts or purchase orders between the Company and the customer, the control of the products is transferred to the customer upon the signing of the goods receipt notes and the customer has no rights to return the products (other than for defective products). Some customers examine and pick up the products at our plant while some local customers instruct us to deliver the products to their plants nearby. Some overseas customers instruct us to deliver the products to the named port of shipment. Delivery of the products occurs at that point of time when the control of the products is transferred to the customer. The selling price, which is specified in the purchase orders, is fixed. Under the terms of the purchase orders, upon the sale of the products to the customer and the signing of the good receipt notes, the Company has the legally enforceable right to receive full payment of the sales price. The customer’s obligation to pay the Company is not dependent on the customer selling the products or collecting cash from their customers (or end customers). The customer is required to pay under normal sales terms. The Company’s normal payment terms range from 30 days to 90 days and its sales arrangements do not have any material financing components. In addition, the Company’s customer arrangements do not produce contract assets or liabilities that are material to its consolidated financial statements. The Company permits the return of damaged or defective products and accounts for these actual returns as deduction from sales. Product returns to the Company were insignificant during past years. Incremental costs to fulfill the Company’s customer arrangements are expensed as incurred, as the amortization period is less than one year. The Company’s sales are net of value added tax (“VAT”) and business tax and surcharges collected on behalf of tax authorities in respect of product sales. VAT and business tax and surcharges collected from customers, net of VAT paid for purchases, is recorded as a liability in the consolidated balance sheets until it is paid to the tax authorities. Outbound freight and Handling costs: The Company accounts for product outbound freight and handling costs as fulfillment activities and present the associated costs in selling expenses in the period in which it sells the product. Disaggregation of Revenues: 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, 2022 Injection Electronic Total Net sales United States of America $ 1,014 $ 9,446 $ 10,460 PRC 20,430 14,018 34,448 United Kingdom 26 6,710 6,736 Hong Kong 1,666 9,927 11,593 Europe 209 13,212 13,421 Canada — 5,503 5,503 Others — 3,819 3,819 Total net sales $ 23,345 $ 62,635 $ 85,980 Year ended March 31, 2023 Injection Electronic Total Net sales United States of America $ 1,006 $ 11,163 $ 12,169 PRC 13,010 14,730 27,740 United Kingdom 2 9,106 9,108 Hong Kong 1,468 5,002 6,470 Europe 131 13,159 13,290 Canada — 4,699 4,699 Others — 3,861 3,861 Total net sales $ 15,617 $ 61,720 $ 77,337 Year ended March 31, 2024 Injection Electronic 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 Allowance for credit losses -13 -Credit The Company estimated the expected credit losses for accounts receivable with similar risk characteristics on a pool basis. For each pool, the Company considers the historical credit loss experience, current economic conditions, supportable forecasts of future economic conditions, and any recoveries in assessing the lifetime expected credit losses. Other key factors that influence the expected credit loss analysis include payment terms offered in the normal course of business to customers and industry -specific Accounts receivable, net, as of March 31, 2023 and 2024 consisted of the following: March 31, 2023 2024 Accounts receivable Less: Allowance for credit losses $ 15,743 $ 12,084 Accounts receivable, net (39 ) (98 ) $ 15,704 $ 11,986 The movement of allowance for credit losses for the years ended March 31, 2022, 2023 and 2024 was as follows: Allowance for credit losses Year ended March 31, 2022 2023 2024 Balance at beginning of the year $ 1,351 $ 268 $ 39 (Reversal of) provision for credit losses, net (148 ) (229 ) 76 Written off (935 ) — (17 ) $ 268 $ 39 $ 98 The provision and reversal of credit losses for the years were charged to other income, net in consolidated statements of comprehensive income. Shipping and handling cost Income taxes -current The Company adopted the provisions of ASC No. 740 “Income Taxes” (“ASC 740”), which clarifies the accounting for uncertainty in income taxes recognized by prescribing a recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. ASC 740 also provides accounting guidance on de -recognition Foreign currency translation All transactions in currencies other than the functional currency during the year are translated at the exchange rates prevailing on the transaction dates. Monetary items existing at the balance sheet date denominated in currencies other than the functional currencies are translated at period end rates. Gains and losses resulting from the translation of foreign currency transactions and balances are included in the consolidated statement of comprehensive income. The exchange rates between the Hong Kong dollars and the U.S. dollar were approximately 7.7904, 7.7904 and 7.7904 as of March 31, 2022, 2023 and 2024, respectively. The exchange rates between the Chinese Renminbi and the U.S. dollar were approximately 6.3924, 6.8806 and 7.1447 as of March 31, 2022, 2023 and 2024, respectively. Aggregate net foreign currency transaction loss included in other income, net was, $352, $256 and $13 for the years ended March 31, 2022, 2023 and 2024, respectively. Post -retirement and post -employment benefits Stock -based compensation -based -date share options or similar equity instruments is measured at the grant date based on the fair value of the award and is recognized over the period during which an employee is required to provide service in exchange for the award, which generally is the vesting period. There were no stock options granted during the year ended March 31, 2022, 2023 and 2024. 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, 2022 2023 2024 Net income attributable to Deswell Industries, Inc. $ 8,232 $ 2,059 $ 7,709 Basic weighted average common shares outstanding 15,929 15,935 15,935 Basic net income per share $ 0.52 $ 0.13 $ 0.48 Year ended March 31, 2022 2023 2024 Basic weighted average common shares outstanding 15,929 15,935 15,935 Effect of dilutive securities – Options 206 137 64 Diluted weighted average common and potential common shares outstanding 16,135 16,072 15,999 Diluted net income per share $ 0.51 $ 0.13 $ 0.48 Use of estimates -lived Fair value of financial instruments Fair value measurements It establishes a three -level Level 1 — Quoted prices in active markets for identical assets or liabilities. Level 1 assets and liabilities include debt and equity securities and derivative contracts that are traded in an active exchange market, as well as certain securities that are highly liquid and are actively traded in over-the-counter markets. Level 2 — Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 3 — Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Level 3 assets and liabilities include financial instruments whose value is determined using pricing models, discounted cash flow methodologies, or similar techniques based on significant unobservable inputs, as well as instruments for which the determination of fair value requires significant management judgment or estimation. Classification within the hierarchy is determined based on the lowest level of input that is significant to the fair value measurement. Non -recurring fair value measurements -lived -recurring Fair value of long -lived -adjusted Reclassifications Recently Adopted Accounting Pronouncements In March 31, 2022, the FASB issued ASU 2022 -02 -02 Recent Accounting Pronouncement Not Yet Adopted In June 30, 2022, the FASB issued ASU 2022 -03 Fair Value Measurement (Topic 820): Fair Value Measurement of Equity Securities Subject to Contractual Sale Restrictions -03 In November 2023, the FASB issued ASU No. 2023 -07 Improvements to Reportable Segment Disclosures In December 2023, the FASB issued ASU No. 2023 -09 Improvements to Income Tax Disclosures

Marketable Securities

Marketable Securities	12 Months Ended
	Mar. 31, 2024
Marketable Securities [Abstract]
Marketable Securities	3. Marketable Securities The Company acquired equity securities listed in Hong Kong Securities Exchange. March 31, 2023 2024 Cost $ 24,292 $ 25,772 Market value $ 20,722 $ 23,026 Included in non -operating Net proceeds from sale of marketable securities for the years ended March 31, 2022, 2023 and 2024 were $11,245, $3,854 and $ nil nil The marketable securities were classified as Level 1 of the hierarchy established under ASC No. 820 because the valuations were based on quoted prices for identical securities in active markets.

Inventories, net

Inventories, net	12 Months Ended
	Mar. 31, 2024
Inventories, net [Abstract]
Inventories, net	4. Inventories, net Inventories, net of allowances, by major categories are summarized as follows: March 31, 2023 2024 Raw materials $ 12,987 $ 8,747 Work-in-progress 2,723 2,285 Finished goods 1,615 1,097 $ 17,325 $ 12,129 Obsolescence allowance for inventory is as follows: Year ended March 31, 2022 2023 2024 Balance at beginning of the year $ 4,307 $ 4,282 $ 4,398 (Written off) additional charges, net (25 ) 116 (24 ) Balance at the end of the year $ 4,282 $ 4,398 $ 4,374

Prepaid Expenses and Other Curr

Prepaid Expenses and Other Current Assets	12 Months Ended
	Mar. 31, 2024
Prepaid Expenses and Other Current Assets [Abstract]
Prepaid Expenses and Other Current Assets	5. Prepaid Expenses and Other Current Assets Prepaid expenses and other current assets consist of the following: March 31, 2023 2024 Rental and utility deposit $ 23 $ 23 Advance to suppliers 129 5 Prepayment 429 404 Dividend receivable 164 196 Others 404 600 $ 1,149 $ 1,228

Property, Plant and Equipment,

Property, Plant and Equipment, Net	12 Months Ended
	Mar. 31, 2024
Property, Plant and Equipment, net [Abstract]
Property, Plant and Equipment, net	6. Property, Plant and Equipment, net Property, plant and equipment, net consist of the following: March 31, 2023 2024 At cost: Leasehold land and buildings $ 32,233 $ 32,233 Plant and machinery 37,293 33,536 Furniture, fixtures and equipment 10,734 10,328 Motor vehicles 1,431 1,352 Leasehold improvements 4,432 4,540 Impairment (2,769 ) (2,308 ) 83,354 79,681 Less: accumulated depreciation and amortization (57,303 ) (55,078 ) Net book value $ 26,051 $ 24,603 Included in furniture, fixtures and equipment is computer software with net values of $26 and $17 as of March 31, 2023 and 2024, respectively. Land use rights and long term leased land included in leasehold land and buildings consist of the following: March 31, 2023 2024 At cost: Land use right of state-owned land (a) $ 2,233 $ 2,233 Long term leased land (b) 947 947 3,180 3,180 Less: accumulated amortization (1,708 ) (1,795 ) $ 1,472 $ 1,385 Amortization expenses for land use rights were $87, $87 and $87 for the years ended March 31, 2022, 2023 and 2024, respectively. ____________ (a) -owned -sum -owned (b) -owned -sum -operation -owned has been granted. According to existing PRC laws and regulations, collectively -owned -operation -owned -owned -operation -owned Included in leasehold land and buildings is property leased to third parties for rental income under operating lease with net values of $2,671 and $2,576 as of March 31, 2023 and 2024, respectively. Details of these property on lease are as follows: Included in leasehold land and buildings: March 31, 2023 2024 Cost $ 4,273 $ 4,273 Less: accumulated depreciation and amortization (1,602 ) (1,697 ) Net book value $ 2,671 $ 2,576 During the years ended March 31, 2022, 2023 and 2024, the Company had no impairment on its property, plant and equipment. Depreciation of property, plant and equipment were $1,736, $1,709 and $1,523 during the years ended March 31, 2022, 2023 and 2024, respectively.

Other Accrued Liabilities

Other Accrued Liabilities	12 Months Ended
	Mar. 31, 2024
Other Accrued Liabilities [Abstract]
Other Accrued Liabilities	7. Other Accrued Liabilities Other accrued liabilities consist of the following: March 31, 2023 2024 Accrued expenses $ 587 $ 806 Others 1,402 430 $ 1,989 $ 1,236

Income Taxes

Income Taxes	12 Months Ended
	Mar. 31, 2024
Income Taxes [Abstract]
Income Taxes	8. Income Taxes Net income before taxes of, $8,067, $2,314 and $7,819 were solely attributed by non -U Under current BVI law, the Company’s income is not subject to taxation in the British Virgin Islands. Subsidiaries operating in Hong Kong and the PRC are subject to income taxes as described below, and the subsidiaries operating in Macao are exempted from income taxes. Under the current Samoa Law, subsidiary incorporated in Samoa is not subject to profit tax as it has no business operations in Samoa. Effective from January 1, 2021, profit in excess of Macau Patacas (“MOP$”) MOP$600 derived from subsidiaries incorporated in Macau are subject to Macau Complementary Tax of 12%. In accordance with the PRC Income Tax Law, the standard income tax for all subsidiaries operating in the PRC is 25%. The provision for income taxes consists of the following: Year ended March 31, 2022 2023 2024 Current tax – PRC $ 249 $ 164 $ 143 – Macau 153 246 126 Deferred tax (567 ) (155 ) (159 ) $ (165 ) $ 255 $ 110 Reconciliation between the provision for income taxes computed by applying the statutory tax rate in the PRC to income before income taxes and the actual provision for income taxes is as follows: Year ended March 31, 2022 2023 2024 Provision for income taxes at statutory tax rate in the PRC $ 2,017 $ 578 $ 1,955 Tax rate differential on entities not subject to PRC income tax (602 ) 520 (547 ) Additional deduction of research and development expenses (227 ) (476 ) (273 ) Foreign rate differences, net (280 ) 724 175 Other non-taxable income (1,338 ) (786 ) (1,194 ) Unrecognized tax benefits 346 (426 ) 119 Other non-deductible expenses 17 32 24 Net change in valuation allowances (62 ) 90 (49 ) Prior year true up (36 ) (1 ) (100 ) Effective tax $ (165 ) $ 255 $ 110 The net deferred income tax consists of the following: March 31, 2023 2024 Deferred income tax assets $ 262 $ 419 Deferred income tax liabilities (484 ) (476 ) Net deferred income tax liabilities $ (222 ) $ (57 ) The components of net deferred income tax are as follows: March 31, 2023 2024 Deferred income tax assets (liabilities): Net operating loss carry forwards $ 48 $ 81 Provision of employee benefits 1,267 1,271 Depreciation and amortization (1,280 ) (1,182 ) Revenue and cost of sales recognized for financial reporting purpose before being recognized for tax purpose (240 ) (107 ) Others 116 (39 ) Less: Valuation allowances (133 ) (81 ) Net deferred income tax liabilities $ (222 ) $ (57 ) The Company operates through the PRC entities and the valuation allowance is considered on each individual basis. The Company’s assessment is that it is not more likely than not that these deferred tax assets will be realized. The net operating loss attributable to those PRC entities can only be carried forward for a maximum period of five years. Tax losses of Macau entities can be carried forward for three years and tax losses of other non -PRC Under the PRC Income Tax Law and the implementation rules, profits of the PRC entities earned on or after January 1, 2008 and distributed by the PRC entities to the Company are subject to a withholding tax at a rate of 10%, unless the Company will be deemed as a resident enterprise for tax purposes. Since the Company intends to reinvest the earnings of the PRC entities in operations in the PRC, the PRC entities do not intend to declare dividends to their immediate non -PRC The Company has adopted the provisions of ASC 740 on April 1, 2007. The evaluation of a tax position in accordance with ASC 740 begins with a determination as to whether it is more -likely-than-not -likely-than-not A reconciliation of the beginning and ending amount of total unrecognized tax benefits is as follows: Year ended March 31, 2022 2023 2024 Balance at the beginning of the year $ 886 $ 1,232 $ 806 Increase (decrease) related to current year tax positions 346 (426 ) 119 Balance at end of the year $ 1,232 $ 806 $ 925 At March 31, 2023 and 2024, there are $806 and $925 of unrecognized tax benefits that if recognized, would affect the annual effective tax rate. For the year ended March 31, 2022, 2023 and 2024, the Company did not recognize any interest and penalties related to unrecognized tax benefits. The Company is currently unable to provide an estimate of a range of the total amount of unrecognized tax benefits that is reasonably possible to change significantly within the next twelve months. According to the PRC Tax Administration and Collection Law, the statute of limitations is three years if the underpayment of taxes is due to computational errors made by the taxpayer or its withholding agent. The statute of limitations extends to five ten In accordance with Guo Shui Fa [2009] No.2, the PRC tax authorities have the right to deem the Company for a tax amount based on the transfer pricing contemporaneous documentations (the “Contemporaneous Documentations”) or a basis that they considered reasonable. The amount of income taxes payable at March 31, 2023 and 2024 includes the deemed profit tax estimated by the management based on the Contemporaneous Documentations.

Lease

Lease	12 Months Ended
	Mar. 31, 2024
Lease [Abstract]
Lease	9. Lease Operating leases as lessor We have non -cancellable Year ending March 31, 2025 $ 176 Total minimum future rental income $ 176 The following table represents lease income recognized in the consolidated statements of comprehensive income: March 31, 2023 2024 Operating lease income $ 1,450 $ 523 Other information: Operating cash flows from operating leases as lessor $ 1,698 $ 550 Operating leases as lessee The Company leases premises and warehouses under various operating leases, certain of which contain escalation clauses. As of March 31, 2023 and 2024, the Company had no material operating lease arrangement with lease terms over 1 year, except for the land use rights and long term leased land. See Note 6 for additional description of the arrangement. The following table represents lease costs recognized in the Company’s consolidated statements of comprehensive income for the year ended March 31, 2022, 2023 and 2024. Lease costs are included in cost of sales, selling, general and administrative expense on the Company’s consolidated statements of comprehensive income. Year ended March 31, 2022 2023 2024 Operating lease costs $ 111 $ 76 $ 79 Total leases costs $ 111 $ 76 $ 79 Year ended March 31, 2022 2023 2024 Supplemental cash flow information for our leases was as follows Operating cash paid for operating lease $ 111 $ 76 $ 79

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Mar. 31, 2024
Commitments and Contingencies [Abstract]
Commitments and Contingencies	10. Commitments and Contingencies The Company leases premises and warehouses under non -cancelable -cancelable At March 31, 2024, the Company had capital commitments for purchase of plant and machinery, and leasehold improvement totaling $90, which are expected to be disbursed during the year ending March 31, 2025.

Employee Benefits

Employee Benefits	12 Months Ended
	Mar. 31, 2024
Employee Benefits [Abstract]
Employee Benefits	11. Employee Benefits The Company contributes to a state pension plan run by the Chinese government in respect of its employees in the PRC. The expense of $784, $754 and $852 included in the consolidated statements of comprehensive income related to this plan, which is based on certain percentages of the employees’ salaries, up to a maximum amount specified by the local government, was provided for the years ended March 31, 2022, 2023 and 2024, respectively.

Stock Option Plan

Stock Option Plan	12 Months Ended
	Mar. 31, 2024
Stock Option Plan [Abstract]
Stock Option Plan	12. Stock Option Plan On March 15, 1995, the Company adopted the 1995 Stock Option Plan that permits the Company to grant options to officers, directors, employees and others to purchase up to 1,012,500 On August 7, 2013, the Company’s Board of Directors, subject to shareholder approval, approved amendments to the 2003 Stock Option Plan to increase by 900,000 As of March 31, 2024, options to purchase an aggregate of 5,669,000 common shares had been granted under the stock option plans. Options granted under the stock option plans vest immediately and are exercisable for a period of up to 10 years commencing on the date of grant, at a price equal to at least the fair market value of the Common Stock at the date of grant, and may contain such other terms as the Board of Directors or a committee appointed to administer the plan may determine. A summary of the option activity (with weighted average prices per option) is as follows: Year ended March 31, 2022 2023 2024 Number Weighted Weighted Number Weighted Weighted Number Weighted Weighted Outstanding at beginning of the year 470,000 $ 2.1 $ 0.51 400,000 $ 2.09 $ 0.50 400,000 $ 2.09 $ 0.50 Exercised during the year (20,000 ) $ 2.14 $ 0.549 — $ — $ — — $ — $ — Cancelled during the year (50,000 ) $ 2.14 $ 0.549 — $ — $ — — $ — $ — Outstanding and exercisable at the end of the year 400,000 $ 2.09 $ 0.50 400,000 $ 2.09 $ 0.50 400,000 $ 2.09 $ 0.50 Range of exercise price per share $ 2.09 $ 2.09 $ 2.09 During the years ended March 31, 2022, 2023 and 2024, the Company recognized employee stock -based nil nil nil As of March 31, 2023 and 2024, the Company had outstanding stock options to acquire an aggregate of 400,000

Other Income, Net

Other Income, Net	12 Months Ended
	Mar. 31, 2024
Other Income, Net [Abstract]
Other income, net	13. Other income, net Other income, net consist of the following: Year ended March 31, 2022 2023 2024 Gain (loss) on disposal of property, plant and equipment, net $ (24 ) $ 18 $ (74 ) Foreign exchange loss, net (352 ) (256 ) (13 ) Reversal of (provision for) credit losses, net 148 229 (76 ) Others 302 1,023 546 Other income, net $ 74 $ 1,014 $ 383

Non-Operating Income (Expenses)

Non-Operating Income (Expenses), Net	12 Months Ended
	Mar. 31, 2024
Non-Operating Income (Expenses), Net [Abstract]
Non-Operating Income (Expenses), Net	14. Non-operating income (expenses), net Non -operating Year ended March 31, 2022 2023 2024 Dividend income from marketable securities $ 974 $ 1,093 $ 1,506 Interest income from bank deposits 245 282 669 Unrealized gain (loss) from marketable securities 872 (3,973 ) 952 Realized gain from sales of marketable securities 1,073 581 — Rental income, net of depreciation charges 2,209 1,328 498 Others (65 ) 116 409 Non-operating income (expenses), net $ 5,308 $ (573 ) $ 4,034

Operating Risk

Operating Risk	12 Months Ended
	Mar. 31, 2024
Operating Risk [Abstract]
Operating Risk	15. Operating Risk Concentrations of Major Customers Percentage of net sales 2022 2023 2024 Customer B 20.1 % 21.4 % 14.5 % Customer C 11.6 % * % * % Customer E * % 19.6 % 19.5 % Customer G * % * % 11.4 % ____________ * Sales to the above customers relate to electronic products. Debtors accounting for 10% or more of total accounts receivable at March 31, 2023 and 2024, respectively, are as follows: Percentage of accounts 2023 2024 Customer E 24.0 % 16.1 % Customer G 15.4 % 19.3 % ____________ * There were $935, $ nil Concentration of credit risk — -to-maturity -to-maturity -to-maturity Concentrations of Suppliers Country risk -inflationary Investment price risk

Segment Information

Segment Information	12 Months Ended
	Mar. 31, 2024
Segment Information [Abstract]
Segment Information	16. Segment Information The Company has two reportable segments: plastic injection molding and electronic products assembling. The Company’s reportable segments are strategic business units that offer different products and services. They are managed separately because each business requires different technology and marketing strategies. Most of the businesses were acquired as a unit, and the management at the time of the acquisition was retained. The Company used to include the corporate expenses, which mainly comprised of directors’ remuneration, legal and professional expenses and corporate insurance expenses, in the segment of plastic injection. Commencing from this year, the corporate expenses are separately disclosed in the segment information for a more precise presentation of the financial performance of each segment. The accounting policies of the segments are the same as those described in the summary of significant accounting policies. The Company accounts for intersegment sales and transfers as if the sales or transfers were to third parties, that is, at current market prices. Contributions of the major activities, profitability information and asset information of the Company’s reportable segments for the years ended March 31, 2022, 2023 and 2024 are as follows: Year ended March 31, 2022 2023 2024 Net sales Intersegment Income Net sales Intersegment Income Net sales Intersegment Income Segment: Injection molded plastic parts $ 23,586 $ (241 ) $ 4,229 $ 15,838 $ (221 ) $ (2,421 ) $ 12,602 $ (211 ) $ 2,309 Electronic products 62,635 — 5,233 61,720 — 6,147 56,977 — 6,772 Segment total $ 86,221 $ (241 ) $ 9,462 $ 77,558 $ (221 ) $ 3,726 $ 69,579 $ (211 ) $ 9,081 Reconciliation to consolidated totals: Sales eliminations (241 ) 241 — (221 ) 221 — (211 ) 211 — Corporate expenses $ (1,395 ) $ (1,412 ) $ (1,262 ) Consolidated totals: Net sales $ 85,980 $ — $ 77,337 $ — $ 69,368 $ — Income before income taxes $ 8,067 $ 2,314 $ 7,819 Year ended March 31, 2022 2023 2024 Interest Interest Interest Interest Interest Interest Segment: Injection molded plastic parts $ 221 $ — $ 255 $ — $ 423 $ — Electronic products 24 — 27 — 246 — Consolidated total $ 245 $ — $ 282 $ — $ 669 $ — Year ended March 31, 2022 2023 2024 Identifiable Capital Depreciation Identifiable Capital Depreciation Identifiable Capital Depreciation Segment: Injection molded plastic parts $ 74,373 $ 783 $ 1,402 $ 68,025 $ 166 $ 1,279 $ 62,760 $ 26 $ 1,048 Electronic products 41,038 721 334 42,354 626 430 48,316 355 475 Consolidated Totals $ 115,411 $ 1,504 $ 1,736 $ 110,379 $ 792 $ 1,709 $ 111,076 $ 381 $ 1,523 The breakdown of sales by destination is analyzed as follows: Year ended March 31, 2022 2023 2024 Net sales United States of America $ 10,460 $ 12,169 $ 7,925 PRC 34,448 27,740 22,121 United Kingdom 6,736 9,108 11,985 Hong Kong 11,593 6,470 8,225 Europe 13,421 13,290 10,016 Canada 5,503 4,699 2,988 Others 3,819 3,861 6,108 Total net sales $ 85,980 $ 77,337 $ 69,368 The location of the Company’s long -lived March 31, 2023 2024 Hong Kong and Macao $ 1 $ 4 PRC 26,050 24,599 Total long-lived assets $ 26,051 $ 24,603

Condensed Financial Information

Condensed Financial Information of Deswell Industries, Inc.	12 Months Ended
	Mar. 31, 2024
Condensed Financial Information of Deswell Industries, Inc. [Abstract]
Condensed Financial Information of Deswell Industries, Inc.	17. Condensed Financial Information of Deswell Industries, Inc. The condensed financial statements for parent company only, have been prepared in accordance with accounting principles generally accepted in the United States of America. Under the PRC laws and regulations, Deswell Industries, Inc.’s PRC subsidiaries are restricted in their ability to transfer certain of their net assets to Deswell Industries, Inc. in the form of dividend payments, loans or advances. The amounts restricted include paid -in Balance sheets March 31, 2023 2024 Assets Current assets: Cash and cash equivalents $ 918 $ 204 Prepaid expenses and other current assets 45 47 Amounts due from subsidiaries 8,228 7,976 Total current assets 9,191 8,227 Investments in subsidiaries 82,154 87,195 Total assets $ 91,345 $ 95,422 Liabilities and shareholders’ equity Current liabilities: Accrued payroll and employee benefits $ 1,573 $ 1,013 Other accrued liabilities 123 239 Total current liabilities 1,696 1,252 Total shareholders’ equity 89,649 94,170 Total liabilities and shareholders’ equity $ 91,345 $ 95,422 Statements of comprehensive income Year ended March 31, 2022 2023 2024 Equity in earnings of subsidiaries $ 8,661 $ 2,488 $ 8,229 Operating expenses 429 429 520 Income before income taxes 8,232 2,059 7,709 Income taxes — — — Net income 8,232 2,059 7,709 Share of other comprehensive income of subsidiaries — — — Total comprehensive income $ 8,232 $ 2,059 $ 7,709 Statements of cash flows Year ended March 31, 2022 2023 2024 Cash flows from operating activities Net income $ 8,232 $ 2,059 $ 7,709 Adjustments to reconcile net income to net cash provided by operating activities: Equity in earnings of subsidiaries (8,661 ) (2,488 ) (8,229 ) Changes in operating assets and liabilities: Prepaid expenses and other current assets — — (2 ) Amounts due from subsidiaries (782 ) 4,305 252 Other accrued liabilities 7 3 (444 ) Net cash (used in) provided by operating activities (1,204 ) 3,879 (714 ) Cash flows from investing activities Dividends received from subsidiary — — 3,188 Net cash provided by investing activities — — 3,188 Cash flows from financing activities Dividends paid (3,186 ) (3,188 ) (3,188 ) Proceeds from exercise of stock options 43 — — Net cash used in financing activities (3,143 ) (3,188 ) (3,188 ) Net (decrease) increase in cash and cash equivalents (4,347 ) 691 (714 ) Cash and cash equivalents, beginning of year 4,574 227 918 Cash and cash equivalents, end of year $ 227 $ 918 $ 204 Basis of presentation In Deswell Industries, Inc. -only Deswell Industries, Inc. records its investments in its subsidiaries under the equity method of accounting as prescribed in ASC 323 “Investment -Equity Certain information and footnote disclosures normally included in financial statements prepared in accordance with U.S. generally accepted accounting principles have been condensed or omitted.

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Pay vs Performance Disclosure
Net Income (Loss)	$ 7,709	$ 2,059	$ 8,232

Insider Trading Policies and Pr

Insider Trading Policies and Procedures	6 Months Ended
	Mar. 31, 2024
Insider Trading Policies and Procedures [Line Items]
Insider Trading Policies and Procedures Adopted	true

Accounting Policies, by Policy

Accounting Policies, by Policy (Policies)	12 Months Ended
	Mar. 31, 2024
Accounting Policies [Abstract]
Principles of consolidation	Principles of consolidation
Cash and cash equivalents	Cash and cash equivalents
Marketable securities	Marketable securities -operating -operating
Held-to-maturity investment	Held -to-maturity investment -to-maturity -operating
Inventories	Inventories -in-progress -moving -moving
Property, plant and equipment	Property, plant and equipment 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
Leases	Leases -of-use liabilities represent the Company’s obligation to make lease payments arising from the lease. Operating lease ROU assets and liabilities are recognized at commencement date based on the present value of lease payments over the lease term. As most of the Company’s leases do not provide an implicit rate, the Company uses its incremental borrowing rate based on the information available at commencement date in determining the present value of lease payments. It uses the implicit rate when readily determinable. The operating lease ROU asset also includes any lease payments made and excludes lease incentives. The Company’s lease terms may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option. Lease expense for lease payments is recognized on a straight -line When the Company is the lessor, minimum contractual rental from leases is recognized on a straight -line -cancelable -line -line -line -line -line
Impairment of long-lived assets	Impairment of long -lived assets -lived -lived -lived -lived -term
Revenue recognition	Revenue recognition Products sales The Company recognizes revenue upon transfer of control of its products to the customer, which typically occurs upon delivery of products or when the customer accepts the injection molds. The Company’s main performance obligation to its customers is the delivery of products in accordance with purchase orders. Each purchase order defines the transaction price for the products purchased under the arrangement. Acceptance of delivery of the products and molds is evidenced by goods receipt notes signed by the customer or the mold acceptance form. The Company has no remaining obligations after the customer’s acceptance of the products. Under the terms of the contracts or purchase orders between the Company and the customer, the control of the products is transferred to the customer upon the signing of the goods receipt notes and the customer has no rights to return the products (other than for defective products). Some customers examine and pick up the products at our plant while some local customers instruct us to deliver the products to their plants nearby. Some overseas customers instruct us to deliver the products to the named port of shipment. Delivery of the products occurs at that point of time when the control of the products is transferred to the customer. The selling price, which is specified in the purchase orders, is fixed. Under the terms of the purchase orders, upon the sale of the products to the customer and the signing of the good receipt notes, the Company has the legally enforceable right to receive full payment of the sales price. The customer’s obligation to pay the Company is not dependent on the customer selling the products or collecting cash from their customers (or end customers). The customer is required to pay under normal sales terms. The Company’s normal payment terms range from 30 days to 90 days and its sales arrangements do not have any material financing components. In addition, the Company’s customer arrangements do not produce contract assets or liabilities that are material to its consolidated financial statements. The Company permits the return of damaged or defective products and accounts for these actual returns as deduction from sales. Product returns to the Company were insignificant during past years. Incremental costs to fulfill the Company’s customer arrangements are expensed as incurred, as the amortization period is less than one year. The Company’s sales are net of value added tax (“VAT”) and business tax and surcharges collected on behalf of tax authorities in respect of product sales. VAT and business tax and surcharges collected from customers, net of VAT paid for purchases, is recorded as a liability in the consolidated balance sheets until it is paid to the tax authorities. Outbound freight and Handling costs: The Company accounts for product outbound freight and handling costs as fulfillment activities and present the associated costs in selling expenses in the period in which it sells the product. Disaggregation of Revenues: 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, 2022 Injection Electronic Total Net sales United States of America $ 1,014 $ 9,446 $ 10,460 PRC 20,430 14,018 34,448 United Kingdom 26 6,710 6,736 Hong Kong 1,666 9,927 11,593 Europe 209 13,212 13,421 Canada — 5,503 5,503 Others — 3,819 3,819 Total net sales $ 23,345 $ 62,635 $ 85,980 Year ended March 31, 2023 Injection Electronic Total Net sales United States of America $ 1,006 $ 11,163 $ 12,169 PRC 13,010 14,730 27,740 United Kingdom 2 9,106 9,108 Hong Kong 1,468 5,002 6,470 Europe 131 13,159 13,290 Canada — 4,699 4,699 Others — 3,861 3,861 Total net sales $ 15,617 $ 61,720 $ 77,337 Year ended March 31, 2024 Injection Electronic 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
Allowance for credit losses	Allowance for credit losses -13 -Credit The Company estimated the expected credit losses for accounts receivable with similar risk characteristics on a pool basis. For each pool, the Company considers the historical credit loss experience, current economic conditions, supportable forecasts of future economic conditions, and any recoveries in assessing the lifetime expected credit losses. Other key factors that influence the expected credit loss analysis include payment terms offered in the normal course of business to customers and industry -specific Accounts receivable, net, as of March 31, 2023 and 2024 consisted of the following: March 31, 2023 2024 Accounts receivable Less: Allowance for credit losses $ 15,743 $ 12,084 Accounts receivable, net (39 ) (98 ) $ 15,704 $ 11,986 The movement of allowance for credit losses for the years ended March 31, 2022, 2023 and 2024 was as follows: Allowance for credit losses Year ended March 31, 2022 2023 2024 Balance at beginning of the year $ 1,351 $ 268 $ 39 (Reversal of) provision for credit losses, net (148 ) (229 ) 76 Written off (935 ) — (17 ) $ 268 $ 39 $ 98 The provision and reversal of credit losses for the years were charged to other income, net in consolidated statements of comprehensive income.
Shipping and handling cost	Shipping and handling cost
Income taxes	Income taxes -current The Company adopted the provisions of ASC No. 740 “Income Taxes” (“ASC 740”), which clarifies the accounting for uncertainty in income taxes recognized by prescribing a recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. ASC 740 also provides accounting guidance on de -recognition
Foreign currency translation	Foreign currency translation All transactions in currencies other than the functional currency during the year are translated at the exchange rates prevailing on the transaction dates. Monetary items existing at the balance sheet date denominated in currencies other than the functional currencies are translated at period end rates. Gains and losses resulting from the translation of foreign currency transactions and balances are included in the consolidated statement of comprehensive income. The exchange rates between the Hong Kong dollars and the U.S. dollar were approximately 7.7904, 7.7904 and 7.7904 as of March 31, 2022, 2023 and 2024, respectively. The exchange rates between the Chinese Renminbi and the U.S. dollar were approximately 6.3924, 6.8806 and 7.1447 as of March 31, 2022, 2023 and 2024, respectively. Aggregate net foreign currency transaction loss included in other income, net was, $352, $256 and $13 for the years ended March 31, 2022, 2023 and 2024, respectively.
Post-retirement and post-employment benefits	Post -retirement and post -employment benefits
Stock-based compensation	Stock -based compensation -based -date share options or similar equity instruments is measured at the grant date based on the fair value of the award and is recognized over the period during which an employee is required to provide service in exchange for the award, which generally is the vesting period. There were no stock options granted during the year ended March 31, 2022, 2023 and 2024.
Net income per share	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, 2022 2023 2024 Net income attributable to Deswell Industries, Inc. $ 8,232 $ 2,059 $ 7,709 Basic weighted average common shares outstanding 15,929 15,935 15,935 Basic net income per share $ 0.52 $ 0.13 $ 0.48 Year ended March 31, 2022 2023 2024 Basic weighted average common shares outstanding 15,929 15,935 15,935 Effect of dilutive securities – Options 206 137 64 Diluted weighted average common and potential common shares outstanding 16,135 16,072 15,999 Diluted net income per share $ 0.51 $ 0.13 $ 0.48
Use of estimates	Use of estimates -lived
Fair value of financial instruments	Fair value of financial instruments
Fair value measurements	Fair value measurements It establishes a three -level Level 1 — Quoted prices in active markets for identical assets or liabilities. Level 1 assets and liabilities include debt and equity securities and derivative contracts that are traded in an active exchange market, as well as certain securities that are highly liquid and are actively traded in over-the-counter markets. Level 2 — Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Level 3 — Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Level 3 assets and liabilities include financial instruments whose value is determined using pricing models, discounted cash flow methodologies, or similar techniques based on significant unobservable inputs, as well as instruments for which the determination of fair value requires significant management judgment or estimation. Classification within the hierarchy is determined based on the lowest level of input that is significant to the fair value measurement.
Non-recurring fair value measurements	Non -recurring fair value measurements -lived -recurring Fair value of long -lived -adjusted
Reclassifications	Reclassifications
Recently Adopted Accounting Pronouncements	Recently Adopted Accounting Pronouncements In March 31, 2022, the FASB issued ASU 2022 -02 -02
Recent Accounting Pronouncement Not Yet Adopted	Recent Accounting Pronouncement Not Yet Adopted In June 30, 2022, the FASB issued ASU 2022 -03 Fair Value Measurement (Topic 820): Fair Value Measurement of Equity Securities Subject to Contractual Sale Restrictions -03 In November 2023, the FASB issued ASU No. 2023 -07 Improvements to Reportable Segment Disclosures In December 2023, the FASB issued ASU No. 2023 -09 Improvements to Income Tax Disclosures

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Mar. 31, 2024
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, 2022 Injection Electronic Total Net sales United States of America $ 1,014 $ 9,446 $ 10,460 PRC 20,430 14,018 34,448 United Kingdom 26 6,710 6,736 Hong Kong 1,666 9,927 11,593 Europe 209 13,212 13,421 Canada — 5,503 5,503 Others — 3,819 3,819 Total net sales $ 23,345 $ 62,635 $ 85,980 Year ended March 31, 2023 Injection Electronic Total Net sales United States of America $ 1,006 $ 11,163 $ 12,169 PRC 13,010 14,730 27,740 United Kingdom 2 9,106 9,108 Hong Kong 1,468 5,002 6,470 Europe 131 13,159 13,290 Canada — 4,699 4,699 Others — 3,861 3,861 Total net sales $ 15,617 $ 61,720 $ 77,337 Year ended March 31, 2024 Injection Electronic 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
Schedule of Accounts Receivable, Net	Accounts receivable, net, as of March 31, 2023 and 2024 consisted of the following: March 31, 2023 2024 Accounts receivable Less: Allowance for credit losses $ 15,743 $ 12,084 Accounts receivable, net (39 ) (98 ) $ 15,704 $ 11,986
Schedule of Allowance for Credit Losses	The movement of allowance for credit losses for the years ended March 31, 2022, 2023 and 2024 was as follows: Allowance for credit losses Year ended March 31, 2022 2023 2024 Balance at beginning of the year $ 1,351 $ 268 $ 39 (Reversal of) provision for credit losses, net (148 ) (229 ) 76 Written off (935 ) — (17 ) $ 268 $ 39 $ 98
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, 2022 2023 2024 Net income attributable to Deswell Industries, Inc. $ 8,232 $ 2,059 $ 7,709 Basic weighted average common shares outstanding 15,929 15,935 15,935 Basic net income per share $ 0.52 $ 0.13 $ 0.48 Year ended March 31, 2022 2023 2024 Basic weighted average common shares outstanding 15,929 15,935 15,935 Effect of dilutive securities – Options 206 137 64 Diluted weighted average common and potential common shares outstanding 16,135 16,072 15,999 Diluted net income per share $ 0.51 $ 0.13 $ 0.48

Marketable Securities (Tables)

Marketable Securities (Tables)	12 Months Ended
	Mar. 31, 2024
Marketable Securities [Abstract]
Schedule of Company Acquired Equity Securities	The Company acquired equity securities listed in Hong Kong Securities Exchange. March 31, 2023 2024 Cost $ 24,292 $ 25,772 Market value $ 20,722 $ 23,026

Inventories, net (Tables)

Inventories, net (Tables)	12 Months Ended
	Mar. 31, 2024
Inventories, net [Abstract]
Schedule of Inventories, Net of Allowances	Inventories, net of allowances, by major categories are summarized as follows: March 31, 2023 2024 Raw materials $ 12,987 $ 8,747 Work-in-progress 2,723 2,285 Finished goods 1,615 1,097 $ 17,325 $ 12,129
Schedule of Obsolescence Allowance for Inventory	Obsolescence allowance for inventory is as follows: Year ended March 31, 2022 2023 2024 Balance at beginning of the year $ 4,307 $ 4,282 $ 4,398 (Written off) additional charges, net (25 ) 116 (24 ) Balance at the end of the year $ 4,282 $ 4,398 $ 4,374

Prepaid Expenses and Other Cu_2

Prepaid Expenses and Other Current Assets (Tables)	12 Months Ended
	Mar. 31, 2024
Prepaid Expenses and Other Current Assets [Abstract]
Schedule of Prepaid Expenses and Other Current Assets	Prepaid expenses and other current assets consist of the following: March 31, 2023 2024 Rental and utility deposit $ 23 $ 23 Advance to suppliers 129 5 Prepayment 429 404 Dividend receivable 164 196 Others 404 600 $ 1,149 $ 1,228

Property, Plant and Equipment_2

Property, Plant and Equipment, Net (Tables)	12 Months Ended
	Mar. 31, 2024
Property, Plant and Equipment, net [Abstract]
Schedule of Property, Plant and Equipment, Net	Property, plant and equipment, net consist of the following: March 31, 2023 2024 At cost: Leasehold land and buildings $ 32,233 $ 32,233 Plant and machinery 37,293 33,536 Furniture, fixtures and equipment 10,734 10,328 Motor vehicles 1,431 1,352 Leasehold improvements 4,432 4,540 Impairment (2,769 ) (2,308 ) 83,354 79,681 Less: accumulated depreciation and amortization (57,303 ) (55,078 ) Net book value $ 26,051 $ 24,603
Schedule of Land Use Rights and Long Term Leased Land	Land use rights and long term leased land included in leasehold land and buildings consist of the following: March 31, 2023 2024 At cost: Land use right of state-owned land (a) $ 2,233 $ 2,233 Long term leased land (b) 947 947 3,180 3,180 Less: accumulated amortization (1,708 ) (1,795 ) $ 1,472 $ 1,385 (a) -owned -sum -owned (b) -owned -sum -operation -owned has been granted. According to existing PRC laws and regulations, collectively -owned -operation -owned -owned -operation -owned March 31, 2023 2024 Cost $ 4,273 $ 4,273 Less: accumulated depreciation and amortization (1,602 ) (1,697 ) Net book value $ 2,671 $ 2,576

Other Accrued Liabilities (Tabl

Other Accrued Liabilities (Tables)	12 Months Ended
	Mar. 31, 2024
Other Accrued Liabilities [Abstract]
Schedule of Other Accrued Liabilities	Other accrued liabilities consist of the following: March 31, 2023 2024 Accrued expenses $ 587 $ 806 Others 1,402 430 $ 1,989 $ 1,236

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Mar. 31, 2024
Income Taxes [Abstract]
Schedule of Provision for Income Taxes	The provision for income taxes consists of the following: Year ended March 31, 2022 2023 2024 Current tax – PRC $ 249 $ 164 $ 143 – Macau 153 246 126 Deferred tax (567 ) (155 ) (159 ) $ (165 ) $ 255 $ 110
Schedule of Statutory Tax Rate	Reconciliation between the provision for income taxes computed by applying the statutory tax rate in the PRC to income before income taxes and the actual provision for income taxes is as follows: Year ended March 31, 2022 2023 2024 Provision for income taxes at statutory tax rate in the PRC $ 2,017 $ 578 $ 1,955 Tax rate differential on entities not subject to PRC income tax (602 ) 520 (547 ) Additional deduction of research and development expenses (227 ) (476 ) (273 ) Foreign rate differences, net (280 ) 724 175 Other non-taxable income (1,338 ) (786 ) (1,194 ) Unrecognized tax benefits 346 (426 ) 119 Other non-deductible expenses 17 32 24 Net change in valuation allowances (62 ) 90 (49 ) Prior year true up (36 ) (1 ) (100 ) Effective tax $ (165 ) $ 255 $ 110
Schedule of Net Deferred Income Tax	The net deferred income tax consists of the following: March 31, 2023 2024 Deferred income tax assets $ 262 $ 419 Deferred income tax liabilities (484 ) (476 ) Net deferred income tax liabilities $ (222 ) $ (57 )
Schedule of Components of Net Deferred Income Tax	The components of net deferred income tax are as follows: March 31, 2023 2024 Deferred income tax assets (liabilities): Net operating loss carry forwards $ 48 $ 81 Provision of employee benefits 1,267 1,271 Depreciation and amortization (1,280 ) (1,182 ) Revenue and cost of sales recognized for financial reporting purpose before being recognized for tax purpose (240 ) (107 ) Others 116 (39 ) Less: Valuation allowances (133 ) (81 ) Net deferred income tax liabilities $ (222 ) $ (57 )
Schedule of Unrecognized Tax Benefits	A reconciliation of the beginning and ending amount of total unrecognized tax benefits is as follows: Year ended March 31, 2022 2023 2024 Balance at the beginning of the year $ 886 $ 1,232 $ 806 Increase (decrease) related to current year tax positions 346 (426 ) 119 Balance at end of the year $ 1,232 $ 806 $ 925

Lease (Tables)

Lease (Tables)	12 Months Ended
	Mar. 31, 2024
Lease [Abstract]
Schedule of Minimum Future Rental Income	At March 31, 2024, the minimum future rental income to be received is as follows: Year ending March 31, 2025 $ 176 Total minimum future rental income $ 176
Schedule of Lease	The following table represents lease income recognized in the consolidated statements of comprehensive income: March 31, 2023 2024 Operating lease income $ 1,450 $ 523 Other information: Operating cash flows from operating leases as lessor $ 1,698 $ 550 Year ended March 31, 2022 2023 2024 Operating lease costs $ 111 $ 76 $ 79 Total leases costs $ 111 $ 76 $ 79 Year ended March 31, 2022 2023 2024 Supplemental cash flow information for our leases was as follows Operating cash paid for operating lease $ 111 $ 76 $ 79

Stock Option Plan (Tables)

Stock Option Plan (Tables)	12 Months Ended
	Mar. 31, 2024
Stock Option Plan [Abstract]
Schedule of Option Activity	A summary of the option activity (with weighted average prices per option) is as follows: Year ended March 31, 2022 2023 2024 Number Weighted Weighted Number Weighted Weighted Number Weighted Weighted Outstanding at beginning of the year 470,000 $ 2.1 $ 0.51 400,000 $ 2.09 $ 0.50 400,000 $ 2.09 $ 0.50 Exercised during the year (20,000 ) $ 2.14 $ 0.549 — $ — $ — — $ — $ — Cancelled during the year (50,000 ) $ 2.14 $ 0.549 — $ — $ — — $ — $ — Outstanding and exercisable at the end of the year 400,000 $ 2.09 $ 0.50 400,000 $ 2.09 $ 0.50 400,000 $ 2.09 $ 0.50 Range of exercise price per share $ 2.09 $ 2.09 $ 2.09

Other Income, Net (Tables)

Other Income, Net (Tables)	12 Months Ended
	Mar. 31, 2024
Other Income, Net [Abstract]
Schedule of Other Income, Net	Other income, net consist of the following: Year ended March 31, 2022 2023 2024 Gain (loss) on disposal of property, plant and equipment, net $ (24 ) $ 18 $ (74 ) Foreign exchange loss, net (352 ) (256 ) (13 ) Reversal of (provision for) credit losses, net 148 229 (76 ) Others 302 1,023 546 Other income, net $ 74 $ 1,014 $ 383

Non-Operating Income (Expense_2

Non-Operating Income (Expenses), Net (Tables)	12 Months Ended
	Mar. 31, 2024
Non-Operating Income (Expenses), Net [Abstract]
Schedule of Non-operating Income (expenses), net	Non -operating Year ended March 31, 2022 2023 2024 Dividend income from marketable securities $ 974 $ 1,093 $ 1,506 Interest income from bank deposits 245 282 669 Unrealized gain (loss) from marketable securities 872 (3,973 ) 952 Realized gain from sales of marketable securities 1,073 581 — Rental income, net of depreciation charges 2,209 1,328 498 Others (65 ) 116 409 Non-operating income (expenses), net $ 5,308 $ (573 ) $ 4,034

Operating Risk (Tables)

Operating Risk (Tables)	12 Months Ended
	Mar. 31, 2024
Sales Revenue, Net [Member]
Operating Risk [Line Items]
Schedule of Operating Risks	Details of customers accounting for 10% or more of total net sales for each of the three years ended March 31, 2022, 2023 and 2024 are as follows: Percentage of net sales 2022 2023 2024 Customer B 20.1 % 21.4 % 14.5 % Customer C 11.6 % * % * % Customer E * % 19.6 % 19.5 % Customer G * % * % 11.4 % *
Accounts Receivable [Member]
Operating Risk [Line Items]
Schedule of Operating Risks	Debtors accounting for 10% or more of total accounts receivable at March 31, 2023 and 2024, respectively, are as follows: Percentage of accounts 2023 2024 Customer E 24.0 % 16.1 % Customer G 15.4 % 19.3 % *

Segment Information (Tables)

Segment Information (Tables)	12 Months Ended
	Mar. 31, 2024
Segment Information [Abstract]
Schedule of Major Activities for Reportable Segments	Contributions of the major activities, profitability information and asset information of the Company’s reportable segments for the years ended March 31, 2022, 2023 and 2024 are as follows: Year ended March 31, 2022 2023 2024 Net sales Intersegment Income Net sales Intersegment Income Net sales Intersegment Income Segment: Injection molded plastic parts $ 23,586 $ (241 ) $ 4,229 $ 15,838 $ (221 ) $ (2,421 ) $ 12,602 $ (211 ) $ 2,309 Electronic products 62,635 — 5,233 61,720 — 6,147 56,977 — 6,772 Segment total $ 86,221 $ (241 ) $ 9,462 $ 77,558 $ (221 ) $ 3,726 $ 69,579 $ (211 ) $ 9,081 Reconciliation to consolidated totals: Sales eliminations (241 ) 241 — (221 ) 221 — (211 ) 211 — Corporate expenses $ (1,395 ) $ (1,412 ) $ (1,262 ) Consolidated totals: Net sales $ 85,980 $ — $ 77,337 $ — $ 69,368 $ — Income before income taxes $ 8,067 $ 2,314 $ 7,819
Schedule of Profitability Information for Reportable Segments	Year ended March 31, 2022 2023 2024 Interest Interest Interest Interest Interest Interest Segment: Injection molded plastic parts $ 221 $ — $ 255 $ — $ 423 $ — Electronic products 24 — 27 — 246 — Consolidated total $ 245 $ — $ 282 $ — $ 669 $ —
Schedule of Asset Information for Reportable Segments	Year ended March 31, 2022 2023 2024 Identifiable Capital Depreciation Identifiable Capital Depreciation Identifiable Capital Depreciation Segment: Injection molded plastic parts $ 74,373 $ 783 $ 1,402 $ 68,025 $ 166 $ 1,279 $ 62,760 $ 26 $ 1,048 Electronic products 41,038 721 334 42,354 626 430 48,316 355 475 Consolidated Totals $ 115,411 $ 1,504 $ 1,736 $ 110,379 $ 792 $ 1,709 $ 111,076 $ 381 $ 1,523
Schedule of Breakdown of Sales by Destination	The breakdown of sales by destination is analyzed as follows: Year ended March 31, 2022 2023 2024 Net sales United States of America $ 10,460 $ 12,169 $ 7,925 PRC 34,448 27,740 22,121 United Kingdom 6,736 9,108 11,985 Hong Kong 11,593 6,470 8,225 Europe 13,421 13,290 10,016 Canada 5,503 4,699 2,988 Others 3,819 3,861 6,108 Total net sales $ 85,980 $ 77,337 $ 69,368
Schedule of Long-Lived Assets	The location of the Company’s long -lived March 31, 2023 2024 Hong Kong and Macao $ 1 $ 4 PRC 26,050 24,599 Total long-lived assets $ 26,051 $ 24,603

Condensed Financial Informati_2

Condensed Financial Information of Deswell Industries, Inc. (Tables)	12 Months Ended
	Mar. 31, 2024
Condensed Financial Information of Deswell Industries, Inc. [Abstract]
Schedule of Condensed Balance Sheet	Balance sheets March 31, 2023 2024 Assets Current assets: Cash and cash equivalents $ 918 $ 204 Prepaid expenses and other current assets 45 47 Amounts due from subsidiaries 8,228 7,976 Total current assets 9,191 8,227 Investments in subsidiaries 82,154 87,195 Total assets $ 91,345 $ 95,422 Liabilities and shareholders’ equity Current liabilities: Accrued payroll and employee benefits $ 1,573 $ 1,013 Other accrued liabilities 123 239 Total current liabilities 1,696 1,252 Total shareholders’ equity 89,649 94,170 Total liabilities and shareholders’ equity $ 91,345 $ 95,422
Schedule of Condensed Income Statement	Statements of comprehensive income Year ended March 31, 2022 2023 2024 Equity in earnings of subsidiaries $ 8,661 $ 2,488 $ 8,229 Operating expenses 429 429 520 Income before income taxes 8,232 2,059 7,709 Income taxes — — — Net income 8,232 2,059 7,709 Share of other comprehensive income of subsidiaries — — — Total comprehensive income $ 8,232 $ 2,059 $ 7,709
Schedule of Condensed Cash Flow Statement	Statements of cash flows Year ended March 31, 2022 2023 2024 Cash flows from operating activities Net income $ 8,232 $ 2,059 $ 7,709 Adjustments to reconcile net income to net cash provided by operating activities: Equity in earnings of subsidiaries (8,661 ) (2,488 ) (8,229 ) Changes in operating assets and liabilities: Prepaid expenses and other current assets — — (2 ) Amounts due from subsidiaries (782 ) 4,305 252 Other accrued liabilities 7 3 (444 ) Net cash (used in) provided by operating activities (1,204 ) 3,879 (714 ) Cash flows from investing activities Dividends received from subsidiary — — 3,188 Net cash provided by investing activities — — 3,188 Cash flows from financing activities Dividends paid (3,186 ) (3,188 ) (3,188 ) Proceeds from exercise of stock options 43 — — Net cash used in financing activities (3,143 ) (3,188 ) (3,188 ) Net (decrease) increase in cash and cash equivalents (4,347 ) 691 (714 ) Cash and cash equivalents, beginning of year 4,574 227 918 Cash and cash equivalents, end of year $ 227 $ 918 $ 204

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Details) $ in Thousands	12 Months Ended
	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)
Summary of Significant Accounting Policies [Line Items]
Interest income on investments	$ 100
Shipping and handling costs	537	$ 450	$ 524
Aggregate net foreign currency transaction	$ 13	$ 256	$ 352
Hong Kong, Dollars [Member]
Summary of Significant Accounting Policies [Line Items]
Exchange rate	7.7904	7.7904	7.7904
Chinese Renminbi, Dollars [Member]
Summary of Significant Accounting Policies [Line Items]
Exchange rate	7.1447	6.8806	6.3924

Summary of Significant Accoun_4

Summary of Significant Accounting Policies (Details) - Schedule of Estimated Useful Lives of Property, Plant and Equipment	Mar. 31, 2024
Minimum [Member] | Leasehold land and buildings [Member]
Schedule of Estimated Useful Lives of Property, Plant and Equipment [Line Items]
Estimated useful lives (years)	30 years
Minimum [Member] | Plant and machinery [Member]
Schedule of Estimated Useful Lives of Property, Plant and Equipment [Line Items]
Estimated useful lives (years)	5 years
Minimum [Member] | Furniture, fixtures and equipment [Member]
Schedule of Estimated Useful Lives of Property, Plant and Equipment [Line Items]
Estimated useful lives (years)	4 years
Minimum [Member] | Motor vehicles [Member]
Schedule of Estimated Useful Lives of Property, Plant and Equipment [Line Items]
Estimated useful lives (years)	3 years
Minimum [Member] | Leasehold improvements [Member]
Schedule of Estimated Useful Lives of Property, Plant and Equipment [Line Items]
Estimated useful lives (years)	2 years
Maximum [Member] | Leasehold land and buildings [Member]
Schedule of Estimated Useful Lives of Property, Plant and Equipment [Line Items]
Estimated useful lives (years)	50 years
Maximum [Member] | Plant and machinery [Member]
Schedule of Estimated Useful Lives of Property, Plant and Equipment [Line Items]
Estimated useful lives (years)	15 years
Maximum [Member] | Furniture, fixtures and equipment [Member]
Schedule of Estimated Useful Lives of Property, Plant and Equipment [Line Items]
Estimated useful lives (years)	5 years
Maximum [Member] | Motor vehicles [Member]
Schedule of Estimated Useful Lives of Property, Plant and Equipment [Line Items]
Estimated useful lives (years)	5 years
Maximum [Member] | Leasehold improvements [Member]
Schedule of Estimated Useful Lives of Property, Plant and Equipment [Line Items]
Estimated useful lives (years)	5 years

Summary of Significant Accoun_5

Summary of Significant Accounting Policies (Details) - Schedule of Disaggregates Product Sales by Business Segment and by Geography - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Summary of Significant Accounting Policies (Details) - Schedule of Disaggregates Product Sales by Business Segment and by Geography [Line Items]
Total net sales	$ 69,368	$ 77,337	$ 85,980
United States of America [Member]
Summary of Significant Accounting Policies (Details) - Schedule of Disaggregates Product Sales by Business Segment and by Geography [Line Items]
Total net sales	7,925	12,169	10,460
PRC [Member]
Summary of Significant Accounting Policies (Details) - Schedule of Disaggregates Product Sales by Business Segment and by Geography [Line Items]
Total net sales	22,121	27,740	34,448
United Kingdom [Member]
Summary of Significant Accounting Policies (Details) - Schedule of Disaggregates Product Sales by Business Segment and by Geography [Line Items]
Total net sales	11,985	9,108	6,736
Hong Kong [Member]
Summary of Significant Accounting Policies (Details) - Schedule of Disaggregates Product Sales by Business Segment and by Geography [Line Items]
Total net sales	8,225	6,470	11,593
Europe [Member]
Summary of Significant Accounting Policies (Details) - Schedule of Disaggregates Product Sales by Business Segment and by Geography [Line Items]
Total net sales	10,016	13,290	13,421
Canada [Member]
Summary of Significant Accounting Policies (Details) - Schedule of Disaggregates Product Sales by Business Segment and by Geography [Line Items]
Total net sales	2,988	4,699	5,503
Others [Member]
Summary of Significant Accounting Policies (Details) - Schedule of Disaggregates Product Sales by Business Segment and by Geography [Line Items]
Total net sales	6,108	3,861	3,819
Injection Molded Plastic Parts [Member]
Summary of Significant Accounting Policies (Details) - Schedule of Disaggregates Product Sales by Business Segment and by Geography [Line Items]
Total net sales	12,392	15,617	23,345
Injection Molded Plastic Parts [Member] | United States of America [Member]
Summary of Significant Accounting Policies (Details) - Schedule of Disaggregates Product Sales by Business Segment and by Geography [Line Items]
Total net sales	1,083	1,006	1,014
Injection Molded Plastic Parts [Member] | PRC [Member]
Summary of Significant Accounting Policies (Details) - Schedule of Disaggregates Product Sales by Business Segment and by Geography [Line Items]
Total net sales	8,202	13,010	20,430
Injection Molded Plastic Parts [Member] | United Kingdom [Member]
Summary of Significant Accounting Policies (Details) - Schedule of Disaggregates Product Sales by Business Segment and by Geography [Line Items]
Total net sales	12	2	26
Injection Molded Plastic Parts [Member] | Hong Kong [Member]
Summary of Significant Accounting Policies (Details) - Schedule of Disaggregates Product Sales by Business Segment and by Geography [Line Items]
Total net sales	3,031	1,468	1,666
Injection Molded Plastic Parts [Member] | Europe [Member]
Summary of Significant Accounting Policies (Details) - Schedule of Disaggregates Product Sales by Business Segment and by Geography [Line Items]
Total net sales	53	131	209
Injection Molded Plastic Parts [Member] | Canada [Member]
Summary of Significant Accounting Policies (Details) - Schedule of Disaggregates Product Sales by Business Segment and by Geography [Line Items]
Total net sales
Injection Molded Plastic Parts [Member] | Others [Member]
Summary of Significant Accounting Policies (Details) - Schedule of Disaggregates Product Sales by Business Segment and by Geography [Line Items]
Total net sales	11
Electronic Products [Member]
Summary of Significant Accounting Policies (Details) - Schedule of Disaggregates Product Sales by Business Segment and by Geography [Line Items]
Total net sales	56,976	61,720	62,635
Electronic Products [Member] | United States of America [Member]
Summary of Significant Accounting Policies (Details) - Schedule of Disaggregates Product Sales by Business Segment and by Geography [Line Items]
Total net sales	6,842	11,163	9,446
Electronic Products [Member] | PRC [Member]
Summary of Significant Accounting Policies (Details) - Schedule of Disaggregates Product Sales by Business Segment and by Geography [Line Items]
Total net sales	13,919	14,730	14,018
Electronic Products [Member] | United Kingdom [Member]
Summary of Significant Accounting Policies (Details) - Schedule of Disaggregates Product Sales by Business Segment and by Geography [Line Items]
Total net sales	11,973	9,106	6,710
Electronic Products [Member] | Hong Kong [Member]
Summary of Significant Accounting Policies (Details) - Schedule of Disaggregates Product Sales by Business Segment and by Geography [Line Items]
Total net sales	5,194	5,002	9,927
Electronic Products [Member] | Europe [Member]
Summary of Significant Accounting Policies (Details) - Schedule of Disaggregates Product Sales by Business Segment and by Geography [Line Items]
Total net sales	9,963	13,159	13,212
Electronic Products [Member] | Canada [Member]
Summary of Significant Accounting Policies (Details) - Schedule of Disaggregates Product Sales by Business Segment and by Geography [Line Items]
Total net sales	2,988	4,699	5,503
Electronic Products [Member] | Others [Member]
Summary of Significant Accounting Policies (Details) - Schedule of Disaggregates Product Sales by Business Segment and by Geography [Line Items]
Total net sales	$ 6,097	$ 3,861	$ 3,819

Summary of Significant Accoun_6

Summary of Significant Accounting Policies (Details) - Schedule of Accounts Receivable, Net - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 31, 2023
Schedule of Accounts Receivable, Net [Abstract]
Accounts receivable	$ 12,084	$ 15,743
Less: Allowance for credit losses	(98)	(39)
Accounts receivable, net	$ 11,986	$ 15,704

Summary of Significant Accoun_7

Summary of Significant Accounting Policies (Details) - Schedule of Allowance for Credit Losses - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Schedule of Allowance for Credit Losses [Abstract]
Balance at beginning of the year	$ 39	$ 268	$ 1,351
(Reversal of) provision for credit losses, net	76	(229)	(148)
Written off	(17)		(935)
Allowance for credit losses	$ 98	$ 39	$ 268

Summary of Significant Accoun_8

Summary of Significant Accounting Policies (Details) - Schedule of Basic Net Income Per Share and Diluted Net Income Per Share - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Schedule of Basic Net Income Per Share and Diluted Net Income Per Share [Abstract]
Net income attributable to Deswell Industries, Inc. (in Dollars)	$ 7,709	$ 2,059	$ 8,232
Basic weighted average common shares outstanding	15,935	15,935	15,929
Effect of dilutive securities – Options	64	137	206
Diluted weighted average common and potential common shares outstanding	15,999	16,072	16,135
Diluted net income per share (in Dollars per share)	$ 0.48	$ 0.13	$ 0.51
Basic net income per share (in Dollars per share)	$ 0.48	$ 0.13	$ 0.52

Marketable Securities (Details)

Marketable Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Marketable Securities [Abstract]
Unrealized gain (loss) on marketable securities	$ 952	$ (3,973)	$ 872
Proceeds from sale of marketable securities		3,854	11,245
Realized gain from sale of marketable securities		$ 581	$ 1,073

Marketable Securities (Detail_2

Marketable Securities (Details) - Schedule of Company Acquired Equity Securities - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 31, 2023
Schedule of Company Acquired Equity Securities [Abstract]
Cost	$ 25,772	$ 24,292
Market value	$ 23,026	$ 20,722

Inventories, net (Details) - Sc

Inventories, net (Details) - Schedule of Inventories, Net of Allowances - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 31, 2023
Schedule of Inventories, Net of Allowances [Abstract]
Raw materials	$ 8,747	$ 12,987
Work-in-progress	2,285	2,723
Finished goods	1,097	1,615
Total inventories	$ 12,129	$ 17,325

Inventories, net (Details) - _2

Inventories, net (Details) - Schedule of Obsolescence Allowance for Inventory - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Schedule of Obsolescence Allowance for Inventory [Abstract]
Balance at beginning of the year	$ 4,398	$ 4,282	$ 4,307
(Written off) additional charges, net	(24)	116	(25)
Balance at the end of the year	$ 4,374	$ 4,398	$ 4,282

Prepaid Expenses and Other Cu_3

Prepaid Expenses and Other Current Assets (Details) - Schedule of Prepaid Expenses and Other Current Assets - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 31, 2023
Schedule of Prepaid Expenses and Other Current Assets [Abstract]
Rental and utility deposit	$ 23	$ 23
Advance to suppliers	5	129
Prepayment	404	429
Dividend receivable	196	164
Others	600	404
Total prepaid expenses and other current assets	$ 1,228	$ 1,149

Property, Plant and Equipment_3

Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Property, Plant and Equipment, net [Line Items]
Net value	$ 24,603	$ 26,051
Amortization expenses	$ 55,078	57,303
Lease terms	50 years
Depreciation of property, plant and equipment	$ 1,523	1,709	$ 1,736
Use Rights [Member]
Property, Plant and Equipment, net [Line Items]
Amortization expenses	87	87	$ 87
Cost of land use rights	28,077	28,077
Dongguan Chang An Xiaobian [Member] | Use Rights [Member]
Property, Plant and Equipment, net [Line Items]
Cost of land use rights	4,156	4,156
Computer Equipment [Member]
Property, Plant and Equipment, net [Line Items]
Net value	$ 17	26
Long Term Leased Land And Buildings [Member]
Property, Plant and Equipment, net [Line Items]
Lease terms	50 years
Property Subject to Operating Lease [Member]
Property, Plant and Equipment, net [Line Items]
Net value	$ 2,576	$ 2,671

Property, Plant and Equipment_4

Property, Plant and Equipment, Net (Details) - Schedule of Property, Plant and Equipment, Net - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 31, 2023
Schedule of Property, Plant and Equipment, Net [Line Items]
Less: accumulated depreciation and amortization	$ (55,078)	$ (57,303)
Net book value	24,603	26,051
Leasehold land and buildings [Member]
Schedule of Property, Plant and Equipment, Net [Line Items]
Cost	32,233	32,233
Plant and machinery [Member]
Schedule of Property, Plant and Equipment, Net [Line Items]
Cost	33,536	37,293
Furniture, fixtures and equipment [Member]
Schedule of Property, Plant and Equipment, Net [Line Items]
Cost	10,328	10,734
Motor vehicles [Member]
Schedule of Property, Plant and Equipment, Net [Line Items]
Cost	1,352	1,431
Leasehold Improvements [Member]
Schedule of Property, Plant and Equipment, Net [Line Items]
Cost	4,540	4,432
Impairment [Member]
Schedule of Property, Plant and Equipment, Net [Line Items]
Impairment	(2,308)	(2,769)
Cost [Member]
Schedule of Property, Plant and Equipment, Net [Line Items]
Cost	$ 79,681	$ 83,354

Property, Plant and Equipment_5

Property, Plant and Equipment, Net (Details) - Schedule of Land Use Rights and Long Term Leased Land - USD ($) $ in Thousands		Mar. 31, 2024	Mar. 31, 2023
Land use rights and long term leased land [Member]
Schedule of Land Use Rights and Long Term Leased Land [Line Items]
Land use right of state-owned land	[1]	$ 2,233	$ 2,233
Long term leased land	[2]	947	947
Land use rights and long term leased land, cost		3,180	3,180
Less: accumulated amortization		(1,795)	(1,708)
Land use rights and long term leased land, net		1,385	1,472
Cost		3,180	3,180
Less: accumulated depreciation and amortization		(1,795)	(1,708)
Net book value		1,385	1,472
Leasehold land and buildings [Member]
Schedule of Land Use Rights and Long Term Leased Land [Line Items]
Land use rights and long term leased land, cost		4,273	4,273
Less: accumulated amortization		(1,697)	(1,602)
Land use rights and long term leased land, net		2,576	2,671
Cost		4,273	4,273
Less: accumulated depreciation and amortization		(1,697)	(1,602)
Net book value		$ 2,576	$ 2,671
[1]The land use rights of state -owned -sum -owned

Other Accrued Liabilities (Deta

Other Accrued Liabilities (Details) - Schedule of Other Accrued Liabilities - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 31, 2023
Schedule of Other Accrued Liabilities [Abstract]
Accrued expenses	$ 806	$ 587
Others	430	1,402
Total other accrued liabilities	$ 1,236	$ 1,989

Income Taxes (Details)

Income Taxes (Details) $ in Thousands		12 Months Ended
	Jan. 01, 2021 MOP (MOP$)	Mar. 31, 2024 USD ($)	Mar. 31, 2023 USD ($)	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)
Income Taxes [Line Items]
Net income (loss) before taxes		$ 7,819	$ 2,314	$ 8,067
Standard income tax rate		10%
Percentage of greater than tax		50%
Unrecognized tax benefits		$ 925	$ 806	$ 1,232	$ 886
Statute of limitiation period		5 years
Macau Patacas [Member]
Income Taxes [Line Items]
Net income (loss) before taxes | MOP$	MOP$ 600
Standard income tax rate	12%
Foreign Tax Jurisdiction [Member]
Income Taxes [Line Items]
Standard income tax rate		25%
Statute of limitiation period		10 years

Income Taxes (Details) - Schedu

Income Taxes (Details) - Schedule of Provision for Income Taxes - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Current tax
Deferred tax	$ (159)	$ (155)	$ (567)
Effective tax	110	255	(165)
PRC [Member]
Current tax
Current tax	143	164	249
Macau [Member]
Current tax
Current tax	$ 126	$ 246	$ 153

Income Taxes (Details) - Sche_2

Income Taxes (Details) - Schedule of Statutory Tax Rate - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Schedule of Statutory Tax Rate [Abstract]
Provision for income taxes at statutory tax rate in the PRC	$ 1,955	$ 578	$ 2,017
Tax rate differential on entities not subject to PRC income tax	(547)	520	(602)
Additional deduction of research and development expenses	(273)	(476)	(227)
Foreign rate differences, net	175	724	(280)
Other non-taxable income	(1,194)	(786)	(1,338)
Unrecognized tax benefits	119	(426)	346
Other non-deductible expenses	24	32	17
Net change in valuation allowances	(49)	90	(62)
Prior year true up	(100)	(1)	(36)
Effective tax	$ 110	$ 255	$ (165)

Income Taxes (Details) - Sche_3

Income Taxes (Details) - Schedule of Net Deferred Income Tax - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 31, 2023
Schedule of Net Deferred Income Tax [Abstract]
Deferred income tax assets	$ 419	$ 262
Deferred income tax liabilities	(476)	(484)
Net deferred income tax liabilities	$ (57)	$ (222)

Income Taxes (Details) - Sche_4

Income Taxes (Details) - Schedule of Components of Net Deferred Income Tax - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 31, 2023
Deferred income tax assets (liabilities):
Net operating loss carry forwards	$ 81	$ 48
Provision of employee benefits	1,271	1,267
Depreciation and amortization	(1,182)	(1,280)
Revenue and cost of sales recognized for financial reporting purpose before being recognized for tax purpose	(107)	(240)
Others	(39)	116
Less: Valuation allowances	(81)	(133)
Net deferred income tax liabilities	$ (57)	$ (222)

Income Taxes (Details) - Sche_5

Income Taxes (Details) - Schedule of Unrecognized Tax Benefits - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Schedule of Unrecognized Tax Benefits [Abstract]
Balance at the beginning of the year	$ 806	$ 1,232	$ 886
Increase (decrease) related to current year tax positions	119	(426)	346
Balance at end of the year	$ 925	$ 806	$ 1,232

Lease (Details)

Lease (Details)	Mar. 31, 2024
Minimum [Member]
Lease [Line Items]
Lease term	1 month
Maximum [Member]
Lease [Line Items]
Lease term	36 months

Lease (Details) - Schedule of M

Lease (Details) - Schedule of Minimum Future Rental Income $ in Thousands	Mar. 31, 2024 USD ($)
Schedule of Minimum Future Rental Income [Abstract]
Year ending March 31, 2025	$ 176
Total minimum future rental income	$ 176

Lease (Details) - Schedule of L

Lease (Details) - Schedule of Lease - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Lessee, Lease, Description [Line Items]
Operating lease income	$ 523	$ 1,450
Operating cash flows from operating leases as lessor	550	1,698
Operating lease costs	79	76	$ 111
Total leases costs	79	76	111
Operating cash paid for operating lease	$ 79	$ 76	$ 111

Commitments and Contingencies (

Commitments and Contingencies (Details) $ in Thousands	Mar. 31, 2024 USD ($)
Purchase Commitment [Member]
Commitments and Contingencies [Line Items]
Plant and machinery, and leasehold improvement totaling	$ 90

Employee Benefits (Details)

Employee Benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Employee Benefits [Abstract]
Pension expense	$ 852	$ 754	$ 784

Stock Option Plan (Details)

Stock Option Plan (Details) - USD ($) $ in Thousands					1 Months Ended				12 Months Ended
	Aug. 07, 2013	Aug. 13, 2010	Jan. 07, 2002	Mar. 15, 1995	Aug. 17, 2007	Sep. 19, 2005	Sep. 30, 2003	Sep. 29, 1997	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Stock Option Plan [Line Items]
Granted									5,669,000
Expiration period of options									10 years
Stock-based compensation expense (in Dollars)
Weighted average remaining contractual life									3 months 18 days
Options available for future grant									1,318,000	1,318,000
Number of vested shares									400,000	400,000
Intrinsic value of options vested (in Dollars)									$ 58	$ 224
The 1995 Stock Option [Member]
Stock Option Plan [Line Items]
Purchase shares of Common Stock				1,012,500
Increased shares of common stock								549,000
Total shares of common stock								1,561,500
The 2001 Stock Option [Member]
Stock Option Plan [Line Items]
Purchase shares of Common Stock			1,125,000
The 2003 Stock Option [Member]
Stock Option Plan [Line Items]
Purchase shares of Common Stock							900,000
Increased shares of common stock		800,000			400,000	500,000
Total shares of common stock		2,600,000			1,800,000	1,400,000
Common Stock [Member]
Stock Option Plan [Line Items]
Number of vested shares									400,000	400,000
Intrinsic value of options outstanding (in Dollars)									$ 58	$ 224
Stock Option Plan Three [Member]
Stock Option Plan [Line Items]
Stock option plan, additional shares authorized	900,000
Stock option plan, shares authorized	3,500,000

Stock Option Plan (Details) - S

Stock Option Plan (Details) - Schedule of Option Activity - $ / shares	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Number of stock options [Member]
Number of Stock Options [Line Items]
Outstanding at beginning of the year (in Shares)	400,000	400,000	470,000
Exercised during the year (in Shares)			(20,000)
Cancelled during the year (in Shares)			(50,000)
Outstanding and exercisable at the end of the year (in Shares)	400,000	400,000	400,000
Weighted Average Exercise price [Member]
Number of Stock Options [Line Items]
Outstanding at beginning of the year	$ 2.09	$ 2.09	$ 2.1
Exercised during the year			2.14
Cancelled during the year			2.14
Outstanding and exercisable at the end of the year	2.09	2.09	2.09
Range of exercise price per share	2.09	2.09	2.09
Weighted Average Grant Date Fair Value [Member]
Number of Stock Options [Line Items]
Outstanding at beginning of the year	0.5	0.5	0.51
Exercised during the year			0.549
Cancelled during the year			0.549
Outstanding and exercisable at the end of the year	$ 0.5	$ 0.5	$ 0.5

Other Income, Net (Details) - S

Other Income, Net (Details) - Schedule of Other Income, Net - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Other Income, Net [Abstract]
Gain (loss) on disposal of property, plant and equipment, net	$ (74)	$ 18	$ (24)
Foreign exchange loss, net	(13)	(256)	(352)
Reversal of (provision for) credit losses, net	(76)	229	148
Others	546	1,023	302
Other income, net	$ 383	$ 1,014	$ 74

Non-Operating Income (Expense_3

Non-Operating Income (Expenses), Net (Details) - Schedule of Non-operating Income (expenses), Net - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Schedule of Non-operating Income (expenses), Net [Abstract]
Dividend income from marketable securities	$ 1,506	$ 1,093	$ 974
Interest income from bank deposits	669	282	245
Unrealized gain (loss) from marketable securities	952	(3,973)	872
Realized gain from sales of marketable securities		581	1,073
Rental income, net of depreciation charges	498	1,328	2,209
Others	409	116	(65)
Non-operating income (expenses), net	$ 4,034	$ (573)	$ 5,308

Operating Risk (Details)

Operating Risk (Details) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Operating Risk [Line Items]
Accounts receivable written off	$ 17		$ 935
Net provision for credit losses	76	(229)	$ (148)
Allowances for credit losses	$ 98	$ 39

Operating Risk (Details) - Sche

Operating Risk (Details) - Schedule of Operating Risks - Customer Concentration Risk [Member] - Sales Revenue, Net	12 Months Ended
	Mar. 31, 2024		Mar. 31, 2023		Mar. 31, 2022
Customer B [Member]
Schedule of Operating Risks [Line Items]
Concentration risk, percentage	14.50%		21.40%		20.10%
Customer C [Member]
Schedule of Operating Risks [Line Items]
Concentration risk, percentage		[1]		[1]	11.60%
Customer E [Member]
Schedule of Operating Risks [Line Items]
Concentration risk, percentage	19.50%		19.60%			[1]
Customer F [Member]
Schedule of Operating Risks [Line Items]
Concentration risk, percentage	11.40%			[1]		[1]
[1]Less than 10%

Operating Risk (Details) - Sc_2

Operating Risk (Details) - Schedule of Operating Risks - Customer Concentration Risk [Member] - Accounts Receivable [Member]	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Customer E [Member]
Schedule of Operating Risks [Line Items]
Concentration risk, percentage	16.10%	24%
Customer G [Member]
Schedule of Operating Risks [Line Items]
Concentration risk, percentage	19.30%	15.40%

Segment Information (Details) -

Segment Information (Details) - Schedule of Major Activities for Reportable Segments - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Segment:
Income before income tax	$ 7,819	$ 2,314	$ 8,067
Injection Molded Plastic Parts [Member]
Segment:
Net sales	12,602	15,838	23,586
Income before income tax	2,309	(2,421)	4,229
Injection Molded Plastic Parts [Member] | Intersegment sales [Member]
Segment:
Intersegment sales	(211)	(221)	(241)
Electronic Products [Member]
Segment:
Net sales	56,977	61,720	62,635
Income before income tax	6,772	6,147	5,233
Electronic Products [Member] | Intersegment sales [Member]
Segment:
Intersegment sales
Segment Total [Member]
Segment:
Net sales	69,579	77,558	86,221
Income before income tax	9,081	3,726	9,462
Segment Total [Member] | Intersegment sales [Member]
Segment:
Intersegment sales	(211)	(221)	(241)
Sales Eliminations [Member]
Segment:
Net sales	(211)	(221)	(241)
Income before income tax
Sales Eliminations [Member] | Intersegment sales [Member]
Segment:
Intersegment sales	211	221	241
Corporate Expenses [Member]
Segment:
Income before income tax	(1,262)	(1,412)	(1,395)
Net Sales [Member]
Segment:
Net sales	69,368	77,337	85,980
Net Sales [Member] | Intersegment sales [Member]
Segment:
Intersegment sales

Segment Information (Details)_2

Segment Information (Details) - Schedule of Profitability Information for Reportable Segments - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Segment:
Interest income from bank deposits	$ 669	$ 282	$ 245
Interest expenses
Injection Molded Plastic Parts [Member]
Segment:
Interest income from bank deposits	423	255	221
Interest expenses
Electronic Products [Member]
Segment:
Interest income from bank deposits	246	27	24
Interest expenses

Segment Information (Details)_3

Segment Information (Details) - Schedule of Asset Information for Reportable Segments - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Segment:
Identifiable assets	$ 111,076	$ 110,379	$ 115,411
Capital expenditure	381	792	1,504
Depreciation and amortization	1,523	1,709	1,736
Injection Molded Plastic Parts [Member]
Segment:
Identifiable assets	62,760	68,025	74,373
Capital expenditure	26	166	783
Depreciation and amortization	1,048	1,279	1,402
Electronic Products [Member]
Segment:
Identifiable assets	48,316	42,354	41,038
Capital expenditure	355	626	721
Depreciation and amortization	$ 475	$ 430	$ 334

Segment Information (Details)_4

Segment Information (Details) - Schedule of Breakdown of Sales by Destination - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Net sales
Net sales from continuing operations	$ 69,368	$ 77,337	$ 85,980
United States [Member]
Net sales
Net sales from continuing operations	7,925	12,169	10,460
China [Member]
Net sales
Net sales from continuing operations	22,121	27,740	34,448
United Kingdom [Member]
Net sales
Net sales from continuing operations	11,985	9,108	6,736
Hong Kong [Member]
Net sales
Net sales from continuing operations	8,225	6,470	11,593
Europe [Member]
Net sales
Net sales from continuing operations	10,016	13,290	13,421
Canada [Member]
Net sales
Net sales from continuing operations	2,988	4,699	5,503
Others [Member]
Net sales
Net sales from continuing operations	$ 6,108	$ 3,861	$ 3,819

Segment Information (Details)_5

Segment Information (Details) - Schedule of Long-Lived Assets - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 31, 2023
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$ 24,603	$ 26,051
Hong Kong And Macao [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	4	1
PRC [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total long-lived assets	$ 24,599	$ 26,050

Condensed Financial Informati_3

Condensed Financial Information of Deswell Industries, Inc. (Details) $ in Thousands, ¥ in Millions	Mar. 31, 2024 USD ($)	Mar. 31, 2024 CNY (¥)	Mar. 31, 2023 USD ($)	Mar. 31, 2023 CNY (¥)
Condensed Financial Information of Deswell Industries, Inc. [Abstract]
Net assets of subsidiaries restricted amount	$ 52,697	¥ 376	$ 54,722	¥ 376

Condensed Financial Informati_4

Condensed Financial Information of Deswell Industries, Inc. (Details) - Schedule of Condensed Balance Sheet - Parent Company [Member] - USD ($) $ in Thousands	Mar. 31, 2024	Mar. 31, 2023
Current assets:
Cash and cash equivalents	$ 204	$ 918
Prepaid expenses and other current assets	47	45
Amounts due from subsidiaries	7,976	8,228
Total current assets	8,227	9,191
Investments in subsidiaries	87,195	82,154
Total assets	95,422	91,345
Current liabilities:
Accrued payroll and employee benefits	1,013	1,573
Other accrued liabilities	239	123
Total current liabilities	1,252	1,696
Total shareholders’ equity	94,170	89,649
Total liabilities and shareholders’ equity	$ 95,422	$ 91,345

Condensed Financial Informati_5

Condensed Financial Information of Deswell Industries, Inc. (Details) - Schedule of Condensed Income Statement - Parent Company [Member] - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Schedule of Condensed Income Statement [Line Items]
Equity in earnings of subsidiaries	$ 8,229	$ 2,488	$ 8,661
Operating expenses	520	429	429
Income before income taxes	7,709	2,059	8,232
Income taxes
Net income	7,709	2,059	8,232
Share of other comprehensive income of subsidiaries
Total comprehensive income	$ 7,709	$ 2,059	$ 8,232

Condensed Financial Informati_6

Condensed Financial Information of Deswell Industries, Inc. (Details) - Schedule of Condensed Cash Flow Statement - Parent Company [Member] - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2022
Cash flows from operating activities
Net income	$ 7,709	$ 2,059	$ 8,232
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in earnings of subsidiaries	(8,229)	(2,488)	(8,661)
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	(2)
Amounts due from subsidiaries	252	4,305	(782)
Other accrued liabilities	(444)	3	7
Net cash (used in) provided by operating activities	(714)	3,879	(1,204)
Cash flows from investing activities
Dividends received from subsidiary	3,188
Net cash provided by investing activities	3,188
Cash flows from financing activities
Dividends paid	(3,188)	(3,188)	(3,186)
Proceeds from exercise of stock options			43
Net cash used in financing activities	(3,188)	(3,188)	(3,143)
Net (decrease) increase in cash and cash equivalents	(714)	691	(4,347)
Cash and cash equivalents, beginning of year	918	227	4,574
Cash and cash equivalents, end of year	$ 204	$ 918	$ 227