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Finance Receivables - Assessment of credit quality by creditworthiness (Details 3) (Finance receivables, USD $)	Dec. 31, 2014	Dec. 31, 2013
Contracts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 431,877,085	$ 395,782,832
Finance receivables, gross contract	435,749,271	399,785,114
Contracts \| Performing accounts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	422,592,527	388,770,979
Contracts \| Non-performing accounts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	9,284,558	7,011,853
Contracts \| Chapter 13 bankrupt accounts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	3,872,186	4,002,282
Direct Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	11,680,909	11,301,076
Finance receivables, gross contract	11,707,683	11,319,887
Direct Loans \| Performing accounts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	11,575,091	11,231,143
Direct Loans \| Non-performing accounts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	105,818	69,933
Direct Loans \| Chapter 13 bankrupt accounts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 26,774	$ 18,811