Note 9 - Derivative Financial Instruments - Share Forward Arrangements (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Share forward arrangements, fair value	$ 3,279	$ 9,159
Equity Securities [Member]
Share forward arrangements, fair value	16,186	26,079
Equity Derivatives [Member]
Share forward arrangements, fair value	883	1,447
Fair Value Receivables [Member]
Share forward arrangements, fair value	3,056	6,278
Share Forward Liabilities [Member]
Share forward arrangements, fair value	$ (16,846)	$ (24,645)