(12) Fair Value Measurements (Details - Level 3 Fair Value Measurements) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Finance receivables measured at fair value	$ 1,523,726	$ 1,444,038	$ 821,066
Portion at Fair Value Measurement [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Finance receivables measured at fair value	1,523,726	1,444,038
Portion at Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Finance receivables measured at fair value	$ 1,523,726	$ 1,444,038
Portion at Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input, Discount Rate [Member] | Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants	10.40%	8.90%
Portion at Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input, Discount Rate [Member] | Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants	11.10%	11.10%
Portion at Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input Cumulative Net Lossese [Member] | Minimum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants	15.30%	15.00%
Portion at Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | Measurement Input Cumulative Net Lossese [Member] | Maximum [Member]
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warrants	18.40%	16.10%