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Finance Receivables - Information regarding delinquency rates with respect to contracts and direct loans (Details 4) (Finance receivables, USD $)
Sep. 30, 2014
Sep. 30, 2013
Contracts
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross Balance Outstanding $ 427,196,623 $ 397,098,910
31 - 60 days 19,923,081 15,504,636
31 - 60 days (in percentage) 4.66% 3.91%
61 - 90 days 5,241,042 2,855,032
61 - 90 days (in percentage) 1.23% 0.72%
Over 90 days 2,844,277 1,841,390
Over 90 days (in percentage) 0.67% 0.46%
Total 28,008,400 20,201,058
Total (in percentage) 6.56% 5.09%
Direct Loans
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Gross Balance Outstanding 11,369,476 10,614,301
31 - 60 days 215,570 104,983
31 - 60 days (in percentage) 1.90% 0.99%
61 - 90 days 77,219 37,604
61 - 90 days (in percentage) 0.68% 0.35%
Over 90 days 23,852 21,246
Over 90 days (in percentage) 0.21% 0.20%
Total $ 316,641 $ 163,833
Total (in percentage) 2.79% 1.54%