Note 6 - Fair Values of Assets and Liabilities (Tables)
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3 Months Ended |
Mar. 31, 2025 |
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| Notes Tables |
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| Fair Value, Assets Measured on Recurring Basis [Table Text Block] |
| Assets – As of March 31, 2025 (1) | | Quoted Prices in Active Markets for Identical Assets (Level 1) | | | Significant Other Observable Inputs (Level 2) | | | Significant Unobservable Inputs (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 | | $ | — | | | $ | — | | | $ | 93,494 | | | $ | 81,238 | |
| Loans at fair value | | $ | — | | | $ | — | | | $ | 2,668,503 | | | $ | 2,668,503 | |
| Assets – As of December 31, 2024 (1) | | Quoted Prices in Active Markets for Identical Assets (Level 1) | | | Significant Other Observable Inputs (Level 2) | | | Significant Unobservable Inputs (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 | | $ | — | | | $ | — | | | $ | 95,871 | | | $ | 84,332 | |
| Loans at fair value | | $ | — | | | $ | — | | | $ | 2,630,274 | | | $ | 2,630,274 | |
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| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] |
| | | Loans at Fair Value | |
| | | 2025 | | | 2024 | |
| Balance at January 1, | | | | | | $ | 2,630,274 | | | | | | | $ | 2,173,759 | |
| Changes in fair value of loans at fair value, included in earnings | | | 55,164 | | | | | | | | 72,508 | | | | | |
| Changes in fair value due to current period principal charge-offs, net of recoveries (1) | | | (163,533 | ) | | | | | | | (167,956 | ) | | | | |
| Changes in fair value due to current period finance and fee charge-offs (1) | | | (69,976 | ) | | | | | | | (63,723 | ) | | | | |
| Total Changes in fair value of loans (2) | | | | | | | (178,345 | ) | | | | | | | (159,171 | ) |
| Purchases | | | | | | | 612,991 | | | | | | | | 530,095 | |
| Finance and fees, added to the account balance | | | | | | | 288,923 | | | | | | | | 248,075 | |
| Settlements | | | | | | | (685,340 | ) | | | | | | | (642,122 | ) |
| Balance at March 31,(3) | | | | | | $ | 2,668,503 | | | | | | | $ | 2,150,636 | |
| Aggregate unpaid gross balance of loans carried at fair value | | | | | | $ | 2,706,264 | | | | | | | $ | 2,318,104 | |
| Change in unrealized losses for the period included in earnings (or changes in net assets) for assets held at the end of the period | | | | | | $ | 55,164 | | | | | | | $ | 72,508 | |
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| Fair Value, Liabilities Measured on Recurring Basis [Table Text Block] |
| Liabilities – As of March 31, 2025 | | Quoted Prices in Active Markets for Identical Assets (Level 1) | | | Significant Other Observable Inputs (Level 2) | | | Significant Unobservable Inputs (Level 3) | | | Carrying Amount of Liabilities | |
| | | | | | | | | | | | | | | | | |
| Loan purchase commitment | | $ | — | | | $ | — | | | $ | 327 | | | $ | 327 | |
| Bank partner fees carried at fair value | | $ | — | | | $ | — | | | $ | 14,158 | | | $ | 14,158 | |
| Liabilities not carried at fair value | | | | | | | | | | | | | | | | |
| Revolving credit facilities | | $ | — | | | $ | — | | | $ | 2,162,132 | | | $ | 2,169,220 | |
| Amortizing debt facilities | | $ | — | | | $ | — | | | $ | 5,412 | | | $ | 5,412 | |
| Senior notes, net | | $ | 305,120 | | | $ | — | | | $ | — | | | $ | 299,656 | |
| Liabilities – As of December 31, 2024 | | Quoted Prices in Active Markets for Identical Assets (Level 1) | | | Significant Other Observable Inputs (Level 2) | | | Significant Unobservable Inputs (Level 3) | | | Carrying Amount of Liabilities | |
| | | | | | | | | | | | | | | | | |
| Loan purchase commitment | | $ | — | | | $ | — | | | $ | 285 | | | $ | 285 | |
| Bank partner fees carried at fair value | | $ | — | | | $ | — | | | $ | 13,644 | | | $ | 13,644 | |
| Liabilities not carried at fair value | | | | | | | | | | | | | | | | |
| Revolving credit facilities | | $ | — | | | $ | — | | | $ | 2,149,933 | | | $ | 2,193,993 | |
| Amortizing debt facilities | | $ | — | | | $ | — | | | $ | 5,455 | | | $ | 5,455 | |
| Senior notes, net | | $ | 281,703 | | | $ | — | | | $ | — | | | $ | 281,552 | |
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| Fair Value Option, Disclosures [Table Text Block] |
| | | | Loans at Fair Value Pledged as Collateral under Structured Financings | |
| | | As of March 31, 2025 | | | As of December 31, 2024 | |
| Aggregate unpaid gross balance of loans carried at fair value | | $ | 2,706,264 | | | $ | 2,724,782 | |
| Aggregate unpaid principal balance included within loans at fair value | | $ | 2,462,012 | | | $ | 2,472,999 | |
| Aggregate fair value of loans at fair value | | $ | 2,668,503 | | | $ | 2,630,274 | |
| 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) | | $ | 30,102 | | | $ | 32,781 | |
| 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 | | $ | 132,705 | | | $ | 145,099 | |
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