Note 6 - Fair Values of Assets and Liabilities - Summary of Other Relevant Data (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Loans, interest and fees receivable, at fair value	$ 1,616,875	$ 1,026,424
Loans and Fees Receivable at Fair Value [Member]
Aggregate unpaid gross balance of loans, interest and fees receivable that are reported at fair value	977	1,249
Aggregate unpaid principal balance included within loans, interest and fees receivable that are reported at fair value	942	1,204
Loans, interest and fees receivable, at fair value	985	1,215
Aggregate fair value of receivables carried at fair value that are 90 days or more past due (which also coincides with finance charge and fee non-accrual policies)	3	8
Unpaid principal balance of receivables within loans, interest and fees receivable that are reported at fair value and are 90 days or more past due (which also coincides with finance charge and fee non-accrual policies) over the fair value of such loans, interest and fees receivable	19	13
Loans and Fees Receivable Pledged as Collateral, Fair Value [Member]
Aggregate unpaid gross balance of loans, interest and fees receivable that are reported at fair value	1,908,884	1,234,039
Aggregate unpaid principal balance included within loans, interest and fees receivable that are reported at fair value	1,734,918	1,131,895
Loans, interest and fees receivable, at fair value	1,615,890	1,025,209
Aggregate fair value of receivables carried at fair value that are 90 days or more past due (which also coincides with finance charge and fee non-accrual policies)	4,406	4,640
Unpaid principal balance of receivables within loans, interest and fees receivable that are reported at fair value and are 90 days or more past due (which also coincides with finance charge and fee non-accrual policies) over the fair value of such loans, interest and fees receivable	$ 97,588	$ 59,656