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Basis of Presentation - Reconciliation of changes in allowance for credit losses on contracts (Details 3) (USD $)
 3 Months Ended 3 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2012
Reported
Jun. 30, 2012
Correction
Jun. 30, 2013
Finance receivables
Mar. 31, 2013
Finance receivables
Jun. 30, 2013
Finance receivables
Contracts
Jun. 30, 2012
Finance receivables
Contracts
Jun. 30, 2012
Finance receivables
Contracts
Reported
Jun. 30, 2012
Finance receivables
Contracts
Correction
Financing Receivable, Allowance for Credit Losses [Roll Forward]                    
Balance at beginning of period         $ 15,403,054 $ 16,558,569 $ 16,090,652 $ 19,499,208 $ 35,495,684 $ (15,996,476)
Discounts acquired on new volume                  3,100,938 (3,100,938)
Provision for credit losses 2,641,791 3,103,266 10,372 3,092,894     2,494,430 3,013,676 (79,218) 3,092,894
Losses absorbed             (4,648,976) (3,659,844) (3,659,844)   
Recoveries             875,067 788,616 788,616   
Discounts accreted                  (521) 521
Balance at end of period         $ 15,403,054 $ 16,558,569 $ 14,811,173 $ 19,641,656 $ 35,645,655 $ (16,003,999)