Note 10 - Subsequent Events (Details Textual) - Largest ACH Customer [Member]	12 Months Ended
Dec. 31, 2021
Percentage of Transaction Volume	49.00%
Percentage of Revenue	8.00%

The percentage of transaction volume of total volume.

No definition available.

Name:	usio_PercentageOfTransactionVolume
Namespace Prefix:	usio_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration