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Finance Receivables - Information regarding delinquency rates with respect to contracts and direct loans (Details 4) (Finance receivables, USD $)
Jun. 30, 2013
Mar. 31, 2013
Jun. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross Balance Outstanding $ 403,447,270 $ 395,721,730  
Contracts
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross Balance Outstanding 393,780,400 386,940,093 385,611,683
31 - 60 days 12,803,342   12,745,275
31 - 60 days (in percentage) 3.25%   3.31%
61 - 90 days 3,540,383   3,216,955
61 - 90 days (in percentage) 0.90%   0.83%
Over 90 days 2,080,951   804,930
Over 90 days (in percentage) 0.53%   0.21%
Total 18,424,676   16,767,160
Total (in percentage) 4.68%   4.35%
Direct Loans
      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gross Balance Outstanding 9,666,870 8,781,637 7,095,917
31 - 60 days 83,885   78,044
31 - 60 days (in percentage) 0.87%   1.10%
61 - 90 days 27,046   19,390
61 - 90 days (in percentage) 0.28%   0.27%
Over 90 days 16,454   4,226
Over 90 days (in percentage) 0.17%   0.06%
Total $ 127,385   $ 101,660
Total (in percentage) 1.32%   1.43%