Finance Receivables - Reconciliation of changes in allowance for credit losses on direct loans (Details 2) (USD $)	3 Months Ended		6 Months Ended				3 Months Ended		6 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Finance receivables	Mar. 31, 2013 Finance receivables	Sep. 30, 2013 Finance receivables Direct Loans	Sep. 30, 2012 Finance receivables Direct Loans	Sep. 30, 2013 Finance receivables Direct Loans	Sep. 30, 2012 Finance receivables Direct Loans
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period					$ 14,138,637	$ 16,558,569	$ 591,881	$ 561,803	$ 467,917	$ 492,184
Current period provision	3,973,104	3,261,721	6,614,895	6,364,987			99,888	14,723	247,249	104,313
Losses absorbed							(42,987)	(49,103)	(70,573)	(74,195)
Recoveries							10,833	3,678	15,022	8,799
Balance at end of period					$ 14,138,637	$ 16,558,569	$ 659,615	$ 531,101	$ 659,615	$ 531,101