Finance Receivables - Information regarding delinquency rates with respect to contracts and direct loans (Details 5) (Finance receivables, USD $)	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Contracts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross Balance Outstanding	$ 443,083,009	$ 410,532,221	$ 386,324,595
30 - 59 days	13,694,370	11,713,021	10,421,500
30 - 59 days (in percentage)	3.09%	2.85%	2.70%
60 - 89 days	3,435,332	2,944,228	2,631,617
60 - 89 days (in percentage)	0.78%	0.72%	0.68%
90 + days	1,330,093	1,896,591	1,188,160
90 + days (in percentage)	0.30%	0.46%	0.31%
Total	18,459,795	16,553,840	14,241,277
Total (in percentage)	4.17%	4.03%	3.69%
Direct Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Gross Balance Outstanding	10,911,845	10,704,545	8,781,637
30 - 59 days	122,718	143,624	72,364
30 - 59 days (in percentage)	1.12%	1.34%	0.82%
60 - 89 days	41,984	25,345	21,509
60 - 89 days (in percentage)	0.39%	0.23%	0.25%
90 + days	14,652	22,515	13,790
90 + days (in percentage)	0.13%	0.21%	0.16%
Total	$ 179,354	$ 191,484	$ 107,663
Total (in percentage)	1.64%	1.78%	1.23%