Document And Entity Information - USD ($)	12 Months Ended
	Mar. 31, 2022	Jun. 30, 2022	Sep. 30, 2021
Document And Entity Information
Document Type	10-K
Document Annual Report	true
Document Period End Date	Mar. 31, 2022
Document Transition Report	false
Entity File Number	001-31747
Entity Registrant Name	UNIVERSAL SECURITY INSTRUMENTS INC
Entity Incorporation, State or Country Code	MD
Entity Tax Identification Number	52-0898545
Entity Address, Address Line One	11407 Cronhill Drive, Suite A
Entity Address, City or Town	Owings Mills
Entity Address, State or Province	MD
Entity Address, Postal Zip Code	21117
City Area Code	410
Local Phone Number	363-3000
Title of 12(b) Security	Common Stock
Trading Symbol	UUU
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 11,440,560
Entity Common Stock, Shares Outstanding		2,312,887
Auditor Name	Marcum LLP
Auditor Firm ID	688
Auditor Location	Philadelphia, PA
Entity Central Index Key	0000102109
Current Fiscal Year End Date	--03-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Amendment Flag	false