Note 2 - Acquisitions - Pro Forma Information (Details) - Northern Plains [Member] - USD ($)	9 Months Ended
Sep. 30, 2017	Sep. 30, 2016
Premium income	$ 9,322,648	$ 5,231,372
Net investment income	544,477	396,697
Net realized gain (loss) on sale of securities	483,130	16,031
Other income	11,594	6,987
Total income	10,361,849	5,651,087
Net Loss	$ (745,970)	$ (1,508,555)
Net Loss per share (in dollars per share)	$ (0.10)	$ (0.21)

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

+ Details

Name:	us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

+ Details

Name:	us-gaap_BusinessAcquisitionsProFormaRevenue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The pro forma basic and diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

No definition available.

+ Details

Name:	usac_BusinessAcquisitionProFormaEarningsPerShareBasicAndDiluted
Namespace Prefix:	usac_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

The pro forma net investment income for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

No definition available.

+ Details

Name:	usac_BusinessAcquisitionProFormaNetInvestmentIncome
Namespace Prefix:	usac_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The pro forma net realized gain (loss) on sale of securities for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

No definition available.

+ Details

Name:	usac_BusinessAcquisitionProFormaNetRealizedGainLossOnSaleOfSecurities
Namespace Prefix:	usac_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The pro forma other income for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

No definition available.

+ Details

Name:	usac_BusinessAcquisitionProFormaOtherIncome
Namespace Prefix:	usac_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The pro forma premium income for a period as if the business combination or combinations had been completed at the beginning of the period.

+ References

No definition available.

+ Details

Name:	usac_BusinessAcquisitionProFormaPremiumIncome
Namespace Prefix:	usac_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_BusinessAcquisitionAxis=usac_NorthernPlainsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: