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Finance Receivables - Assessment of credit quality by creditworthiness (Details 3) (Finance receivables, USD $)
Dec. 31, 2013
Mar. 31, 2013
Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total $ 411,105,001 $ 395,721,730  
Contracts
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 399,785,114 386,940,093 380,519,395
Contracts | Non-bankrupt accounts
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 395,782,832 386,324,594  
Contracts | Bankrupt accounts
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 4,002,282 615,499  
Contracts | Performing accounts
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 389,390,841 382,843,130  
Contracts | Non-performing accounts
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 10,394,273 4,096,963  
Direct Loans
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 11,319,887 5,721,768 8,861,098
Direct Loans | Non-bankrupt accounts
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 11,301,076 5,721,768  
Direct Loans | Bankrupt accounts
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 18,811     
Direct Loans | Performing accounts
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 11,236,408 5,685,981  
Direct Loans | Non-performing accounts
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total $ 83,479 $ 35,787