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Finance Receivables - Assessment of credit quality by creditworthiness (Details 3) - Finance receivables - USD ($)
$ in Thousands
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Accounts Notes And Loans Receivable [Line Items]      
Total $ 188,397   $ 211,515
Finance receivables 188,626   211,813
Chapter 13 bankruptcy      
Accounts Notes And Loans Receivable [Line Items]      
Finance receivables 229   298
Direct Loans      
Accounts Notes And Loans Receivable [Line Items]      
Total 14,227 $ 11,844 11,423
Finance receivables 14,238   11,432
Direct Loans | Chapter 13 bankruptcy      
Accounts Notes And Loans Receivable [Line Items]      
Finance receivables 11   9
Performing accounts      
Accounts Notes And Loans Receivable [Line Items]      
Total 180,996   203,002
Performing accounts | Direct Loans      
Accounts Notes And Loans Receivable [Line Items]      
Total 13,925   11,229
Non-performing accounts      
Accounts Notes And Loans Receivable [Line Items]      
Total 7,401   8,513
Non-performing accounts | Direct Loans      
Accounts Notes And Loans Receivable [Line Items]      
Total 302   194
Contract Portfolio      
Accounts Notes And Loans Receivable [Line Items]      
Total 174,170 $ 207,247 200,092
Finance receivables 174,388   200,381
Contract Portfolio | Chapter 13 bankruptcy      
Accounts Notes And Loans Receivable [Line Items]      
Finance receivables 218   289
Contract Portfolio | Performing accounts      
Accounts Notes And Loans Receivable [Line Items]      
Total 167,071   191,773
Contract Portfolio | Non-performing accounts      
Accounts Notes And Loans Receivable [Line Items]      
Total $ 7,099   $ 8,319