Note 12 - Commitments (Details Textual)	Dec. 31, 2022 USD ($)
Mutual Capital Investment Fund, LP [Member]
Subscription Agreement, Capital Commitment	$ 2,000,000

The amount of capital commitment under subscription agreement.

No definition available.

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