9. Fair Value Measurements (Details - Level 3 Fair Value Measurements) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Finance receivables measured at fair value	$ 1,158,365	$ 821,066	$ 997,552	$ 412,895	$ 209,847	$ 0
Fair Value [Member] | Level 3 [Member]
Finance receivables measured at fair value	$ 1,158,365	$ 821,066
Fair Value [Member] | Level 3 [Member] | Discount Rate [Member]
Unobservable Inputs	8.9% - 11.12%	8.9% - 9.9%
Fair Value [Member] | Level 3 [Member] | Cumulative Net Losses [Member]
Unobservable Inputs	15% - 16.10%	15% - 16%