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Finance Receivables - Assessment of credit quality by creditworthiness (Details 4) (USD $)
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total $ 4,390,000    
Finance receivables | Contracts
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 413,613,292 386,940,093 382,766,667
Finance receivables | Contracts | Performing accounts
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 408,772,473 383,120,316  
Finance receivables | Contracts | Non-performing accounts
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 4,840,819 3,819,777  
Finance receivables | Direct Loans
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 10,730,901 8,781,637 6,221,688
Finance receivables | Direct Loans | Performing accounts
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 10,683,041 8,746,338  
Finance receivables | Direct Loans | Non-performing accounts
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total $ 47,860 $ 35,299