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Finance Receivables (Details 1) (USD $)
 3 Months Ended 6 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period     $ 35,987,868  
Current period provision 308,340 178,029 318,712 257,444
Balance at end of period 34,631,762   34,631,762  
Finance receivables | Contracts
        
Financing Receivable, Allowance for Credit Losses [Roll Forward]        
Balance at beginning of period 35,645,655 36,534,432 35,495,684 35,895,449
Discounts acquired on new volume 2,843,382 2,966,280 5,944,320 6,076,091
Current period provision 308,340 178,029 318,712 257,444
Losses absorbed (5,295,524) (3,777,929) (8,955,368) (6,794,563)
Recoveries 763,687 542,240 1,552,303 1,105,108
Discounts accreted (150,157) (17,873) (150,678) (34,127)
Balance at end of period $ 34,100,661 $ 36,356,666 $ 34,100,661 $ 36,356,666