Note 9 - Derivative Financial Instruments - Balance Sheet Information (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Derivative financial instruments, fair value, net	$ (1,824)	$ 3,492
TBA and Other Forward MBS [Member] | Long [Member] | Investments -Trading [Member]
Derivative financial instruments, fair value, net	4,369	4,669
TBA and Other Forward MBS [Member] | Short [Member] | Trading Securities Sold, Not Yet Purchased [Member]
Derivative financial instruments, fair value, net	$ (6,193)	$ (1,177)