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Credit Card Revenue [Member] Information pertaining to credit card revenue. Prepaid Card Services Revenue [Member] Information pertaining to prepaid card services revenue. Internal Use Software, Policy [Policy Text Block] Depreciation us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) Equipment loan, current portion Legal Costs, Policy [Policy Text Block] us-gaap_SharesIssuedPricePerShare Shares Issued, Price Per Share (in dollars per share) us-gaap_AssetsCurrent Total current assets Treasury stock, shares (in shares) Louis Hoch [Member] Information pertaining to Louis Hoch. Common stock, $0.001 par value, 200,000,000 shares authorized; 28,779,206 and 28,661,406 issued, and 26,412,259 and 26,332,523 outstanding at March 31, 2024 (unaudited) and December 31, 2023, respectively Adjustments to reconcile net income (loss) to net cash (used in) operating activities: Common stock, authorized (in shares) Common stock, issued (in shares) Common stock, par value (in dollars per share) Angry Pug Sportswear [Member] Information pertaining to Angry Pug Sportswear. usio_OwnershipPercentage Ownership Percentage Represents the percentage of ownership. 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Entity Address, Address Line One Statement of Financial Position [Abstract] Diluted income (loss) per common share: (in dollars per share) Weighted average shares used to compute basic earnings per share (in shares) us-gaap_TreasuryStockValueAcquiredCostMethod Treasury Stock, Value, Acquired, Cost Method Purchase of treasury stock costs ecd_NonRule10b51ArrTrmntdFlag Non-Rule 10b5-1 Arrangement Terminated [Flag] Amortization Entity Address, City or Town ecd_Rule10b51ArrTrmntdFlag Rule 10b5-1 Arrangement Terminated [Flag] ecd_Rule10b51ArrAdoptedFlag Rule 10b5-1 Arrangement Adopted [Flag] Entity Address, Postal Zip Code us-gaap_TreasuryStockCommonValue Treasury stock, at cost; 2,366,947 and 2,339,083 shares at March 31, 2024 (unaudited) and December 31, 2023, respectively Basic income (loss) per common share: (in dollars per share) Entity Address, State or Province ecd_NonRule10b51ArrAdoptedFlag Non-Rule 10b5-1 Arrangement Adopted [Flag] Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Material Terms of Trading Arrangement [Text Block] Statement of Cash Flows [Abstract] Entity Common Stock, Shares Outstanding Statement of Stockholders' Equity [Abstract] Income Statement [Abstract] us-gaap_IncreaseDecreaseInOtherCurrentAssets Other assets us-gaap_IncreaseDecreaseInInventories Inventory Trading Symbol Schedule of Accounts Payable and Accrued Liabilities [Table Text Block] Other SG&A Local Phone Number Output Solutions [Member] Represents output solutions. us-gaap_TableTextBlock Notes Tables Customer Deposits [Policy Text Block] Disclosure of accounting policy for customer deposits. Related and Nonrelated Parties [Axis] Related and Nonrelated Parties [Domain] Employee Awards [Member] Related to employee awards. Issuance of common stock under equity incentive plan (in shares) Debit Arrangement to Finance Purchase of Output Solutions Sorter [Member] Represents the debit arrangement to finance the purchase of the Output Solutions sorter. us-gaap_SellingGeneralAndAdministrativeExpense Total selling, general and administrative usio_CustomerDepositsAssetsCurrent Customer deposits Customer deposits Carrying value as of the balance sheet date of customer deposit assets, classified as current. Issuance of common stock under equity incentive plan Financing activities: us-gaap_WarrantsAndRightsOutstandingMeasurementInput Warrants and Rights Outstanding, Measurement Input Warrants Issued to Acquire Information Management Solutions, LLC [Member] Represents information regarding warrants issued as part of the consideration for the acquisition of Information Management Solutions, LLC. Director Six [Member] Represents director six. Director Five [Member] Represents director five. Selling, general and administrative expenses: usio_ClassOfWarrantOrRightIssuedDuringPeriod Class of Warrant or Right, Issued During Period (in shares) The number of warrants or rights issued during period. us-gaap_LiabilitiesAndStockholdersEquity Total liabilities and stockholders’ equity Contingent Liability Reserve Estimate, Policy [Policy Text Block] Accumulated deficit Settlement processing assets Carrying amount as of the balance sheet date of the settlement processing assets that are expected to be liquidated within one year or the normal operating cycle, if longer. Measurement Input, Share Price [Member] Debt Disclosure [Text Block] Merchant reserves Merchant reserves Merchant reserves Carrying amount as of the balance sheet date of the merchant reserves, classified as current. usio_AssetsNoncurrentExcludingPropertyPlantAndEquipmentNet Total other assets Sum of the carrying amounts as of the balance sheet date of assets, excluding property, plant and equipment that are expected to be realized in cash, sold or consumed after one year or beyond the normal operating cycle, if longer. us-gaap_InterestExpense Interest expense Settlement processing obligations Carrying amount as of the balance sheet date of the settlement processing liabilities that are expected to be liquidated within one year or the normal operating cycle, if longer. 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Operating lease right-of-use assets Measurement Input Type [Axis] Measurement Input Type [Domain] Prepaid card load obligations Represents the amount of prepaid card load liabilities, classified as current.