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Finance Receivables - Assessment of credit quality by creditworthiness (Details 3) (Finance receivables, USD $)
Jun. 30, 2013
Mar. 31, 2013
Jun. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total $ 403,447,270 $ 395,721,730  
Contracts
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 393,780,400 386,940,093 385,611,683
Contracts | Non-bankrupt accounts
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 391,977,580 386,324,594  
Contracts | Bankrupt accounts
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 1,802,820 615,499  
Contracts | Performing accounts
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 388,159,066 382,843,130  
Contracts | Non-performing accounts
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 5,621,334 4,096,963  
Direct Loans
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 9,666,870 8,781,637 7,095,917
Direct Loans | Non-bankrupt accounts
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 9,654,948 8,779,270  
Direct Loans | Bankrupt accounts
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 11,922 2,367  
Direct Loans | Performing accounts
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total 9,623,370 8,746,338  
Direct Loans | Non-performing accounts
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Total $ 43,500 $ 35,299