(2) Finance Receivables (Details - Amortized Cost Basis) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
FinanceReceivablesDelinquencyStatusLineItems [Line Items]
Amortized cost basis	$ 410,623	$ 491,307
Vintage Pool 2012 [Member]
FinanceReceivablesDelinquencyStatusLineItems [Line Items]
Amortized cost basis	427	608
Vintage Pool 2013 [Member]
FinanceReceivablesDelinquencyStatusLineItems [Line Items]
Amortized cost basis	3,102	4,483
Vintage Pool 2014 [Member]
FinanceReceivablesDelinquencyStatusLineItems [Line Items]
Amortized cost basis	17,169	23,115
Vintage Pool 2015 [Member]
FinanceReceivablesDelinquencyStatusLineItems [Line Items]
Amortized cost basis	62,428	78,457
Vintage Pool 2016 [Member]
FinanceReceivablesDelinquencyStatusLineItems [Line Items]
Amortized cost basis	136,699	163,677
Vintage Pool 2017 [Member]
FinanceReceivablesDelinquencyStatusLineItems [Line Items]
Amortized cost basis	$ 190,798	$ 220,967