Note 5 - Securitizations and Variable Interest Entities - VIE (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Securitizations and Variable Interest Entities
Total assets	$ 8,538,894	$ 7,948,837	$ 6,096,132
Liabilities	7,652,298	$ 7,176,113
VIE
Securitizations and Variable Interest Entities
Total assets	22,400
Liabilities	0
Maximum exposure to loss	$ 31,800