Note 6 - Contingencies and Commitments (Details Textual) - USD ($)	Jun. 30, 2023	Dec. 31, 2022
Unfunded Commitments for Investment in Limited Partnership Interest	$ 1,738,000	$ 2,000,000

Represents unfunded commitments for investment in limited partnership interest.

No definition available.

Name:	usac_UnfundedCommitmentsForInvestmentInLimitedPartnershipInterest
Namespace Prefix:	usac_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant