Note 6 - Fair Values of Assets and Liabilities (Tables)
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6 Months Ended |
Jun. 30, 2026 |
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| Notes Tables |
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| Fair Value, Assets Measured on Recurring Basis [Table Text Block] |
| Assets – As of June 30, 2026 (1) | | Level 1 | | | Level 2 | | | Level 3 | | | Carrying Amount of Assets | |
| Loans at amortized cost, net for which it is practicable to estimate fair value and which are carried at net amortized cost | | $ | — | | | $ | — | | | $ | 91,190 | | | $ | 77,731 | |
| Loans at fair value | | $ | — | | | $ | — | | | $ | 6,658,748 | | | $ | 6,658,748 | |
| Assets – As of December 31, 2025 (1) | | Level 1 | | | Level 2 | | | Level 3 | | | Carrying Amount of Assets | |
| Loans at amortized cost, net for which it is practicable to estimate fair value and which are carried at net amortized cost | | $ | — | | | $ | — | | | $ | 97,539 | | | $ | 82,884 | |
| Loans at fair value | | $ | — | | | $ | — | | | $ | 6,647,882 | | | $ | 6,647,882 | |
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| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] |
| | | Loans at Fair Value | |
| | | 2026 | | | 2025 | |
| Balance at January 1, | | | | | | $ | 6,647,882 | | | | | | | $ | 2,630,274 | |
| Changes in fair value of loans at fair value, included in earnings | | $ | 77,908 | | | | | | | $ | 50,134 | | | | | |
| Changes in fair value due to current period principal charge-offs, net of recoveries (1) | | | (593,588 | ) | | | | | | | (307,029 | ) | | | | |
| Changes in fair value due to current period finance and fee charge-offs (1) | | | (246,124 | ) | | | | | | | (138,227 | ) | | | | |
| Total Changes in fair value of loans (2) | | | | | | | (761,804 | ) | | | | | | | (395,122 | ) |
| Change in Contingent consideration and other purchase price adjustments (3) | | | | | | | (18,500 | ) | | | | | | | — | |
| Purchases | | | | | | | 3,063,869 | | | | | | | | 1,562,566 | |
| Finance and fees, added to the account balance | | | | | | | 1,190,224 | | | | | | | | 594,944 | |
| Settlements | | | | | | | (3,462,923 | ) | | | | | | | (1,387,938 | ) |
| Balance at June 30,(4) | | | | | | $ | 6,658,748 | | | | | | | $ | 3,004,724 | |
| Aggregate unpaid gross balance of loans carried at fair value | | | | | | $ | 6,891,217 | | | | | | | $ | 3,046,477 | |
| Change in unrealized losses for the period included in earnings (or changes in net assets) for assets held at the end of the period | | | | | | $ | 77,908 | | | | | | | $ | 50,134 | |
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| Fair Value, Liabilities Measured on Recurring Basis [Table Text Block] |
| Liabilities – As of June 30, 2026 | | Level 1 | | | Level 2 | | | Level 3 | | | Carrying Amount of Liabilities | |
| Bank partner fees | | $ | — | | | $ | — | | | $ | 19,882 | | | $ | 19,882 | |
| Contingent consideration | | $ | — | | | $ | — | | | $ | 22,000 | | | $ | 22,000 | |
| Liabilities not carried at fair value | | | | | | | | | | | | | | | | |
| Revolving credit facilities | | $ | — | | | $ | — | | | $ | 5,814,679 | | | $ | 5,573,683 | |
| Amortizing debt facilities | | $ | — | | | $ | — | | | $ | 5,199 | | | $ | 5,199 | |
| Senior notes, net | | $ | 311,285 | | | $ | — | | | $ | 393,322 | | | $ | 692,117 | |
| Liabilities – As of December 31, 2025 | | Level 1 | | | Level 2 | | | Level 3 | | | Carrying Amount of Liabilities | |
| Bank partner fees | | $ | — | | | $ | — | | | $ | 28,668 | | | $ | 28,668 | |
| Contingent consideration | | $ | — | | | $ | — | | | $ | 40,000 | | | $ | 40,000 | |
| Liabilities not carried at fair value | | | | | | | | | | | | | | | | |
| Revolving credit facilities | | $ | — | | | $ | — | | | $ | 5,972,582 | | | $ | 5,813,474 | |
| Amortizing debt facilities | | $ | — | | | $ | — | | | $ | 5,287 | | | $ | 5,287 | |
| Senior notes, net | | $ | 317,364 | | | $ | — | | | $ | 392,000 | | | $ | 698,562 | |
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| Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] |
| | | Fair Value at | | | | | | | Fair Value at | |
| | | December 31, 2025 | | | Changes in fair value of liabilities, included in earnings | | | June 30, 2026 | |
| Bank partner fees | | $ | 28,668 | | | $ | (8,786 | ) | | $ | 19,882 | |
| Contingent consideration | | $ | 40,000 | | | $ | (18,000 | ) | | $ | 22,000 | |
| | | | | | | | | | | | | |
| | | | | | | | | | | | | |
| | | Fair Value at | | | | | | | Fair Value at | |
| | | December 31, 2024 | | | Changes in fair value of liabilities, included in earnings | | | June 30, 2025 | |
| Bank partner fees | | | 13,644 | | | | 2,135 | | | | 15,779 | |
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| Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] |
| | | June 30, 2026 | | | December 31, 2025 | |
| | | Range | | | Weighted Average | | | Range | | | Weighted Average | |
| Bank partner fees | | | | | | | | | | | | | | | | |
| Customer Payment Rate | | 5.4% -10.3% | | | 8.3 | % | | | 5.7% - 10.1% | | | | 8.4 | % |
| Discount Rate | | 8.5% - 12.5% | | | 9.8 | % | | | 8.5% - 12.5% | | | | 9.7 | % |
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| Contingent consideration | | | | | | | | | | | | | | | | |
| Charge-off rate | | 19.7%-27.0% | | | 21.9 | % | | | 16.2%-24.0% | | | | 19.8 | % |
| Charge-off volatility | | 15.0 | % | | 15.0 | % | | | 15.0 | % | | | 15.0 | % |
Other Relevant Data
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| Fair Value Option, Disclosures [Table Text Block] |
| | | | Loans at Fair Value Pledged as Collateral under Structured Financings | |
| | | As of June 30, 2026 | | | As of December 31, 2025 | |
| Aggregate unpaid gross balance of loans carried at fair value | | $ | 6,891,217 | | | $ | 6,940,489 | |
| Aggregate unpaid principal balance included within loans at fair value | | $ | 6,404,420 | | | $ | 6,472,891 | |
| Aggregate fair value of loans at fair value | | $ | 6,658,748 | | | $ | 6,647,882 | |
| Aggregate fair value of loans at fair value that are 90 days or more past due (which also coincides with finance charge and fee non-accrual policies) | | $ | 55,453 | | | $ | 57,624 | |
| Unpaid principal balance of loans at fair value and are 90 days or more past due (which also coincides with finance charge and fee non-accrual policies) over the fair value of such loans, interest and fees receivable | | $ | 290,506 | | | $ | 330,032 | |
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