Finance Receivables (Details 1) (USD $)	3 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	$ 35,987,868
Current period provision	10,372	79,415
Balance at end of period	36,207,458
Finance receivables | Contracts
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	35,495,684	35,895,449
Discounts acquired on new volume	3,100,938	3,109,811
Current period provision	(79,218)	(808)
Losses absorbed	(3,659,844)	(3,016,634)
Recoveries	788,616	562,868
Discounts accreted	(521)	(16,254)
Balance at end of period	$ 35,645,655	$ 36,534,432