Note 14 - Variable Interest Entities - Consolidated VIEs (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024	Dec. 31, 2023
Cash and cash equivalents	$ 54,688	$ 19,590
Other receivables	8,454	6,526
Other investments, at fair value	64,361	35,262
Investment in equity method affiliates	11,752	23,430	$ 14,241
Accounts payable and other liabilities	(10,371)	(10,913)
Variable Interest Entity, Primary Beneficiary [Member]
Cash and cash equivalents	9	59
Other receivables	0	19
Receivables from brokers, dealers, and clearing agencies	0	2,154
Other investments, at fair value	1,157	5,680
Investment in equity method affiliates	5,707	15,881
Accounts payable and other liabilities	0	(4)
Other investments sold, not yet purchased, at fair value	0	(1,591)
Non-controlling interest	(3,910)	(11,460)
Investment in consolidated VIEs	$ 2,963	$ 10,738