Note 5 - Investment in Equity-method Investee - Summary of Equity-method Investee (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Total assets	$ 1,943,863	$ 1,207,214
Total liabilities	1,516,714	991,354
Members’ capital	287,499	76,510	$ 335
Net margin	748,056	563,410
Net income	177,789	93,917
Net income attributable to investee	16	456
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]
Loans, interest and fees receivables, at fair value	0	1,994
Total assets	0	2,105
Total liabilities	0	10
Members’ capital	0	2,095
Net margin	94	819
Net income	$ 23	$ 684