Finance Receivables - Assessment of credit quality by creditworthiness (Details 3) - Finance receivables - USD ($) $ in Thousands	Sep. 30, 2019	Sep. 30, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 221,876	$ 263,560
Finance receivables	222,320	267,236
Chapter 13 bankruptcy
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables	444	3,676
Direct Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	9,480	7,465
Finance receivables	9,488	7,559
Direct Loans | Chapter 13 bankruptcy
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables	8	94
Performing accounts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	214,767	251,978
Performing accounts | Direct Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	9,309	7,248
Non-performing accounts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	7,109	11,582
Non-performing accounts | Direct Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	171	217
Contract Portfolio
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	212,396	256,095
Finance receivables	212,832	259,677
Contract Portfolio | Chapter 13 bankruptcy
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables	436	3,582
Contract Portfolio | Performing accounts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	205,458	244,730
Contract Portfolio | Non-performing accounts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 6,938	$ 11,365