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Significant Accounting Policies, Commissions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Commissions [Abstract]
Address commissions	$ 1,761	$ 1,113	$ 424

X

- Definition

Fee paid by vessel owners to charterers.

+ References

No definition available.

+ Details

Name:	usea_AddressCommissions
Namespace Prefix:	usea_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	usea_CommissionsAbstract
Namespace Prefix:	usea_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration