Note A - Organization, Consolidation, and Basis of Presentation (Details Textual)	3 Months Ended
Apr. 02, 2022
Number of Geographic Regions	2
Number of Sub Geographical Regions	3

The number of sub-geogaphical regions the company operates in.

No definition available.

Name:	usna_NumberOfSubGeographicalRegions
Namespace Prefix:	usna_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration