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Note 2 - Significant Accounting Policies and Condensed Consolidated Financial Statement Components (Details Textual) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Payment for Acquisition, Loan and Lease, Held-for-Investment | $ 48,900,000 | $ 59,000,000 | $ 161,100,000 | $ 179,300,000 |
Financing Receivable, Deferred Commitment Fee | $ 16,900,000 |  | $ 16,900,000 |  | $ 17,900,000
Weighted Average Remaining Accretion Period of Deferred Revenue (Month) |  |  | 24 months |  | 26 months
Effective Income Tax Rate Reconciliation, Percent | 21.50% | 21.20% | 19.70% | 22.50% |
Unrecognized Tax Benefits, Interest on Income Taxes Expense |  |  | $ 140,000 | $ 1,400,000 |

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