5. Interest Income and Interest Expense (Details - Interest expense) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Total interest expense	$ 27,290	$ 24,062
Securitization Trust Debt [Member]
Total interest expense	23,988	21,829
Warehouse Lines of Credit [Member]
Total interest expense	2,020	1,887
Residual interest financing [Member]
Total interest expense	956	0
Subordinated renewable notes [Member]
Total interest expense	$ 326	$ 346