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Note 8 - Related Party Transactions (Details Textual) - Louis Hoch [Member] - USD ($)	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024
Related Party Transaction, Purchases from Related Party	$ 4,841	$ 9,747
Angry Pug Sportswear [Member]
Ownership Percentage	50.00%

X

- Definition

Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

+ References

No definition available.

+ Details

Name:	us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents the percentage of ownership.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=usio_LouisHochMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_OwnershipAxis=usio_AngryPugSportswearMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: