Document And Entity Information - shares	6 Months Ended
	Sep. 30, 2014	Nov. 14, 2014
Document Information [Line Items]
Entity Registrant Name	UNIVERSAL SECURITY INSTRUMENTS INC
Entity Central Index Key	0000102109
Current Fiscal Year End Date	--03-31
Entity Filer Category	Smaller Reporting Company
Trading Symbol	UUU
Entity Common Stock, Shares Outstanding		2,312,887
Document Type	10-Q
Amendment Flag	true
Document Period End Date	Sep. 30, 2014
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2015
Amendment Description	The Registrant hereby amends Part 1 Items 1, 2 and 4 of its Quarterly Report on Form 10-Q for the fiscal quarter ended September 30, 2014, which was filed with the Commission on November 19, 2014. The purpose of the amendment is to correct our reported results of operations and those of the Registrant’s 50%-owned Hong Kong Joint Venture (HKJV) as shown in the Registrant’s financial statements and notes thereto, and Management’s Discussion and Analysis included in the Report. The Company increased its equity in the loss of the HKJV for the three month and six month periods ended September 30, 2014 by $158,052 and reduced its investment in the HKJV by $158,052 at September 30, 2014. The net loss per share for the three and six month periods ended September 30, 2014 increased from $0.41 to $0.48 and from $0.73 to $0.80, respectively. Except as described above, no other amendments are being made to the Company’s Quarterly Report on Form 10-Q filed on November 19, 2014. This Form 10-Q/A does not reflect events occurring after the November 19, 2014 filing of our Quarterly Report on Form 10-Q or modify or update the disclosures contained in the Quarterly Report in any way other than required to include such conformed information as described above.