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Note 8 - Related Party Transactions (Details Textual) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Angry Pug Sportswear [Member] |  |  |
Related Party Transaction, Purchases from Related Party |  | $ 4,756 | $ 4,402
Louis Hoch [Member] | 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_AngryPugSportswearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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: |