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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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