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Finance Receivables (Details 1) (USD $)
 3 Months Ended 9 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period     $ 35,987,868  
Current period provision 818,903 454,339 1,137,615 711,783
Balance at end of period 32,695,952   32,695,952  
Finance receivables | Contracts
        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 34,100,661 36,356,666 35,495,684 35,895,449
Discounts acquired on new volume 2,485,560 2,729,337 8,469,382 8,805,428
Current period provision 757,347 450,951 971,746 559,659
Losses absorbed (5,571,903) (4,474,500) (14,527,271) (11,269,063)
Recoveries 786,891 559,716 2,339,194 1,664,824
Discounts accreted (404,994) (8,570) (595,173) (42,697)
Balance at end of period $ 32,153,562 $ 35,613,600 $ 32,153,562 $ 35,613,600