Note 6 - Fair Values of Assets and Liabilities - Quantitative Information about Level 3 Assets and Liabilities Fair Value Measurements (Details) $ in Thousands	Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)
Loans, interest and fees receivable, at fair value	$ 1,616,875	$ 1,026,424
Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Gross Yield [Member]
Loans, interest and fees receivable, at fair value	$ 1,616,875	$ 1,026,424
Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Gross Yield [Member] | Minimum [Member]
Loans and fees receivable, measurement input	0.278	0.227
Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Gross Yield [Member] | Maximum [Member]
Loans and fees receivable, measurement input	0.469	0.565
Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Gross Yield [Member] | Weighted Average [Member]
Loans and fees receivable, measurement input	0.323	0.409
Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Constant Prepayment Rate [Member] | Minimum [Member]
Loans and fees receivable, measurement input	0.054	0.039
Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Constant Prepayment Rate [Member] | Maximum [Member]
Loans and fees receivable, measurement input	0.129	0.114
Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Constant Prepayment Rate [Member] | Weighted Average [Member]
Loans and fees receivable, measurement input	0.110	0.106
Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Default Rate [Member] | Minimum [Member]
Loans and fees receivable, measurement input	0.078	0.069
Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Default Rate [Member] | Maximum [Member]
Loans and fees receivable, measurement input	0.264	0.314
Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Default Rate [Member] | Weighted Average [Member]
Loans and fees receivable, measurement input	0.312	0.235
Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Servicing Rate [Member] | Minimum [Member]
Loans and fees receivable, measurement input	0.034	0.029
Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Servicing Rate [Member] | Maximum [Member]
Loans and fees receivable, measurement input	0.057	0.142
Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Servicing Rate [Member] | Weighted Average [Member]
Loans and fees receivable, measurement input	0.038	0.046
Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member] | Minimum [Member]
Loans and fees receivable, measurement input	0.123	0.128
Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member] | Maximum [Member]
Loans and fees receivable, measurement input	0.135	0.135
Valuation Technique, Discounted Cash Flow [Member] | Measurement Input, Discount Rate [Member] | Weighted Average [Member]
Loans and fees receivable, measurement input	0.101	0.129