Note 14 - Variable Interest Entities - Consolidated VIEs (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Cash and cash equivalents	$ 11,829	$ 10,650
Other investments, at fair value	59,533	72,217
Investment in equity method affiliates	43,281	14,241
Variable Interest Entity, Primary Beneficiary [Member]
Cash and cash equivalents	529	27
Due from broker	6,094	461
Other investments, at fair value	20,522	34,129
Investment in equity method affiliates	33,514	2,638
Other investments sold, not yet purchased, at fair value	(16,846)	(24,396)
Non-controlling interest	(25,874)	(9,604)
Investment in consolidated VIEs	$ 17,939	$ 3,255