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Finance Receivables - Assessment of credit quality by creditworthiness (Details 3) (Finance receivables, USD $)
Sep. 30, 2014
Sep. 30, 2013
Contracts
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total $ 427,196,623 $ 397,098,910
Finance receivables, gross contract 430,782,264 400,093,559
Contracts | Performing accounts
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 419,111,304 392,402,488
Contracts | Non-performing accounts
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 8,085,319 4,696,422
Contracts | Chapter 13 bankrupt accounts
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Finance receivables, gross contract 3,585,641 2,994,649
Direct Loans
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 11,369,476 10,614,301
Finance receivables, gross contract 11,401,831 10,623,932
Direct Loans | Performing accounts
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 11,268,405 10,555,451
Direct Loans | Non-performing accounts
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total 101,071 58,850
Direct Loans | Chapter 13 bankrupt accounts
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Finance receivables, gross contract $ 32,355 $ 9,631