Note 7 - Variable Interest Entities - Summary of Variable Interest Entities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022
Unrestricted cash and cash equivalents	$ 355,707	$ 384,984
Restricted cash and cash equivalents	44,315	48,208
Loans, interest and fees receivable, at fair value	2,049,993	1,817,976
Total Assets held by VIEs	2,596,901	2,387,814	$ 2,252,331
Notes Payable, net held by VIEs	1,788,098	1,653,306
Maximum exposure to loss due to involvement with VIEs	1,957,100	1,756,000
Variable Interest Entity, Primary Beneficiary [Member]
Unrestricted cash and cash equivalents	162,700	202,200
Restricted cash and cash equivalents	25,600	27,600
Loans, interest and fees receivable, at fair value	2,031,300	1,735,900
Total Assets held by VIEs	2,219,600	1,965,700
Notes Payable, net held by VIEs	$ 1,719,700	$ 1,586,000