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Note 12 - Subsequent Events (Details Textual) - Chief Executive Officer [Member] - Subsequent Event [Member] - USD ($)	Apr. 18, 2021	Apr. 17, 2021
Annual Base Salary	$ 566,000	$ 350,000
Annual Bonus Cancelled	$ 216,000

X

- Definition

The amount of annual base salary.

+ References

No definition available.

+ Details

Name:	usio_AnnualBaseSalary
Namespace Prefix:	usio_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of annual bonus cancelled.

+ References

No definition available.

+ Details

Name:	usio_AnnualBonusCancelled
Namespace Prefix:	usio_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	srt_TitleOfIndividualAxis=srt_ChiefExecutiveOfficerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: