Note 9 - Derivative Financial Instruments (Details Textual) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Other Extended Settlement Trade [Member] | Long [Member]
Derivative, Notional Amount	$ 0		$ 0
Equity Derivatives [Member] | Short [Member]
Derivative Asset	72		1,447
TBA and Other Forward MBS [Member] | Long [Member]
Derivative, Notional Amount	1,143,600		592,000
TBA and Other Forward MBS [Member] | Short [Member]
Derivative, Notional Amount	1,165,260		618,425
Foreign Exchange Forward [Member]
Derivative, Notional Amount	0		$ 0
Share Forward Liabilities [Member]
Gain (Loss) on Investments	$ (20,038)	$ (32,229)