| Cover | Feb. 14, 2025 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Feb. 14, 2025 |
| Entity File Number | 001-31747 |
| Entity Registrant Name | Universal Security Instruments, Inc. |
| Entity Central Index Key | 0000102109 |
| Entity Tax Identification Number | 52-0898545 |
| Entity Incorporation, State or Country Code | MD |
| Entity Address, Address Line One | 11407 Cronhill Drive |
| Entity Address, Address Line Two | 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 |
| Written Communications | false |
| Soliciting Material | true |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock |
| Trading Symbol | UUU |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
