Note 4 - CMBS Trusts - Schedule of Recognized Trusts Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Mortgage loans held in variable interest entities, at fair value	$ 283,866	$ 241,517
Bonds payable held in variable interest entities, at fair value	1,273,519
Variable Interest Entity, Primary Beneficiary [Member]
Mortgage loans held in variable interest entities, at fair value	6,980,129	7,192,547
Accrued interest receivable	2,898	2,212
Bonds payable held in variable interest entities, at fair value	6,488,498	6,726,272
Accrued interest payable	$ (2,168)	$ (1,500)