Document and Entity Information - shares	6 Months Ended
	Sep. 30, 2024	Nov. 19, 2024
Document and Entity Information
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2024
Current Fiscal Year End Date	--03-31
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
Entity Address, Address Line Two	Suite A
Entity Address, City or Town	Owings Mills
Entity Address, Country	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 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 Common Stock, Shares Outstanding		2,312,887
Entity Central Index Key	0000102109
Document Fiscal Year Focus	2025
Document Fiscal Period Focus	Q2
Amendment Flag	false