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Finance Receivables - Assessment of credit quality by creditworthiness (Details 3) - Finance receivables - USD ($)
Sep. 30, 2015
Sep. 30, 2014
Contracts    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total $ 475,089,306 $ 427,196,623
Finance receivables, gross contract 479,357,943 430,782,264
Contracts | Performing accounts    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 466,911,165 419,111,304
Contracts | Non-performing accounts    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 8,178,141 8,085,319
Contracts | Chapter 13 bankrupt accounts    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 4,268,637 3,585,641
Direct Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 11,673,195 11,369,476
Finance receivables, gross contract 11,706,343 11,401,831
Direct Loans | Performing accounts    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 11,619,304 11,268,405
Direct Loans | Non-performing accounts    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 53,891 101,071
Direct Loans | Chapter 13 bankrupt accounts    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total $ 33,148 $ 32,355