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Note 4 - SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - VIE (Details) $ in Thousands | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2024 USD ($) item | Sep. 30, 2025 USD ($) | Aug. 31, 2025 USD ($) | Sep. 30, 2024 USD ($) | Aug. 31, 2024 USD ($)
Securitizations and Variable Interest Entities |  |  |  |  |
Number of sponsored securitizations completed | item | 4 |  |  |  |
Pledged securities held to maturity, at amortized cost | $ 835,797 | $ 954,115 |  |  |
Total assets | 9,026,030 | 9,568,302 |  | $ 9,088,565 |
Liabilities | 8,028,643 | 8,481,387 |  |  |
Municipal certificates |  |  |  |  |
Securitizations and Variable Interest Entities |  |  |  |  |
Secured borrowing |  |  | $ 200,300 |  |
Class A municipal certificates |  |  |  |  |
Securitizations and Variable Interest Entities |  |  |  |  |
Secured borrowing |  |  | 134,200 |  |
Assets pledged as collateral |  |  |  |  |
Securitizations and Variable Interest Entities |  |  |  |  |
Pledged securities held to maturity, at amortized cost | 0 | 200,283 | 200,300 |  | $ 200,300
Assets pledged as collateral | Class A municipal certificates |  |  |  |  |
Securitizations and Variable Interest Entities |  |  |  |  |
Pledged securities held to maturity, at amortized cost |  |  | 134,200 |  |
Assets pledged as collateral | Class B municipal certificates |  |  |  |  |
Securitizations and Variable Interest Entities |  |  |  |  |
Pledged securities held to maturity, at amortized cost |  |  | $ 66,100 |  |
VIE |  |  |  |  |
Securitizations and Variable Interest Entities |  |  |  |  |
Total assets | 83,500 | 83,200 |  |  |
Liabilities | $ 0 | 0 |  |  |
Maximum exposure to loss |  | $ 85,500 |  |  |

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