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Finance Receivables - Assessment of the credit quality by creditworthiness (Details 4) (USD $)
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total $ 4,132,000 $ 2,572,000 $ 2,035,000
Contracts
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 386,940,093 382,766,667 368,099,418
Contracts | Non-bankrupt accounts
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 386,324,594 382,358,608  
Contracts | Bankrupt accounts
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 615,499 408,059  
Contracts | Performing accounts
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 382,843,130 380,213,503  
Contracts | Non-performing accounts
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 4,096,963 2,553,164  
Direct Loans
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 8,781,637 6,221,688 4,850,865
Direct Loans | Non-bankrupt accounts
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 8,779,270 4,844,683  
Direct Loans | Bankrupt accounts
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 2,367 6,182  
Direct Loans | Performing accounts
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 8,746,338 4,833,310  
Direct Loans | Non-performing accounts
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total $ 35,299 $ 17,555