Note 2 - Investments - Mortgage Loans by Maturity Date (Details) - USD ($)	Jun. 30, 2020	Dec. 31, 2019
One year or less	$ 962,690

The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio, which are due in one year or less after the period end date.

No definition available.

Name:	usac_MortgageLoansOnRealEstateCommercialAndConsumerNetDueOneYearOrLess
Namespace Prefix:	usac_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant