Note 7 - Financial Instruments - Other Investments, at Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Other Investments, Fair Value Disclosure	$ 59,533	$ 72,217
Restricted Equity Securities [Member]
Other Investments, Fair Value Disclosure	7,743	2,054
Corporate Bonds and Redeemable Preferred Stock [Member]
Other Investments, Fair Value Disclosure	522	506
CREO JV [Member]
Other Investments, Fair Value Disclosure	5,362	4,783
U.S. Insurance JV [Member]
Other Investments, Fair Value Disclosure	3,111	3,107
Residential Mortgage [Member]
Other Investments, Fair Value Disclosure	131	132
Equity Securities [Member]
Other Investments, Fair Value Disclosure	27,773	38,038
Equity Derivatives [Member]
Other Investments, Fair Value Disclosure	956	1,447
Fair Value Receivables [Member]
Other Investments, Fair Value Disclosure	9,824	9,541
Interest In SPVs [Member]
Other Investments, Fair Value Disclosure	$ 4,111	$ 12,609