Note 9 - Derivative Financial Instruments - Statement of Operations Information (Details) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
TBA and Other Forward MBS [Member]
Derivative financial instruments	$ 1,191	$ 432
Equity Derivatives Included in Investment Banking and New Issue [Member]
Derivative financial instruments	9,275	0
Equity Derivatives Included in Principal Transactions and Other Income Loss [Member]
Derivative financial instruments	$ (7)	$ 0