Earnings per Common Share (Details) - shares	6 Months Ended
Sep. 30, 2021	Sep. 30, 2020
Earnings per Common Share
Number of potentially dilutive common stock equivalents outstanding	0	0

The number of potentially dilutive common stock equivalents outstanding.

No definition available.

Name:	uuu_NumberOfPotentiallyDilutiveCommonStockEquivalents
Namespace Prefix:	uuu_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration