Document And Entity Information - shares	3 Months Ended
	Jun. 30, 2018	Aug. 20, 2018
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2018
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
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