Loss Per Unit (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 28, 2026	Mar. 29, 2025
Class A Units [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Income attributable to USPB available to unitholders (numerator)	$ (699)	$ (1,058)
Weighted average outstanding units, Basic	735,385	735,385
Weighted average outstanding units, Diluted	735,385	735,385
Income per unit, Basic	$ (0.95)	$ (1.44)
Income per unit, Diluted	$ (0.95)	$ (1.44)
Class B Units [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Income attributable to USPB available to unitholders (numerator)	$ (6,294)	$ (9,525)
Weighted average outstanding units, Basic	755,385	755,385
Weighted average outstanding units, Diluted	755,385	755,385
Income per unit, Basic	$ (8.33)	$ (12.61)
Income per unit, Diluted	$ (8.33)	$ (12.61)

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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