Note 6 - Fair Values of Assets and Liabilities - Summary of Other Relevant Data (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Loans, interest and fees receivable, at fair value	$ 5,394	$ 6,306
Loans and Fees Receivable at Fair Value [Member]
Aggregate unpaid principal balance within loans, interest and fees receivable that are reported at fair value	1,016	1,160
Loans, interest and fees receivable, at fair value	618	655
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	3
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	28	35
Structured Financing Notes Payable [Member]
Aggregate unpaid principal balance within loans, interest and fees receivable that are reported at fair value	101,314	101,314
Aggregate fair value of notes payable	4,776	5,651
Loans and Fees Receivable Pledged as Collateral, Fair Value [Member]
Aggregate unpaid principal balance within loans, interest and fees receivable that are reported at fair value	7,009	7,708
Loans, interest and fees receivable, at fair value	4,776	5,651
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)	8	7
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	$ 252	$ 224