Note 7 - Financial Instruments - Other Investments, at Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Other Investments, Fair Value Disclosure	$ 80,205	$ 57,258
Cohen & Company Capital Markets (CCM) [Member]
Other Investments, Fair Value Disclosure	63,162	34,208
Non CCM [Member]
Other Investments, Fair Value Disclosure	17,043	23,050
Non CCM [Member] \| CREO JV [Member]
Other Investments, Fair Value Disclosure	7,684	8,940
Non CCM [Member] \| U.S. Insurance JV [Member]
Other Investments, Fair Value Disclosure	1,624	2,375
Placement Unit and Warrants [Member] \| Cohen & Company Capital Markets (CCM) [Member]
Other Investments, Fair Value Disclosure	56,990	18,492
Other Long-Term Investments [Member] \| Cohen & Company Capital Markets (CCM) [Member]
Other Investments, Fair Value Disclosure	331	1,333
Other Long-Term Investments [Member] \| Non CCM [Member]
Other Investments, Fair Value Disclosure	1,007	2,969
CK Capital Value Fund [Member] \| Non CCM [Member]
Other Investments, Fair Value Disclosure	$ 1,417	$ 1,171