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Finance Receivables - Assessment of credit quality by creditworthiness (Details 4) - Finance receivables - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 30, 2017
Contract Portfolio    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total $ 256,095 $ 311,132
Finance receivables, net 259,677 315,033
Contract Portfolio | Performing accounts    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 245,603 293,673
Contract Portfolio | Non-performing accounts    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 10,492 17,459
Contract Portfolio | Chapter 13 bankrupt accounts    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 3,582 3,901
Direct Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 7,465 8,169
Finance receivables, net 7,559 8,204
Direct Loans | Performing accounts    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 7,257 7,953
Direct Loans | Non-performing accounts    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 208 216
Direct Loans | Chapter 13 bankrupt accounts    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total $ 94 $ 35