Finance Receivables - Assessment of credit quality by creditworthiness (Details 3) (Finance receivables, USD $)	Sep. 30, 2013	Mar. 31, 2013	Sep. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 410,717,491	$ 395,721,730
Contracts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	400,093,559	386,940,093	388,783,924
Contracts | Non-bankrupt accounts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	397,098,910	386,324,594
Contracts | Bankrupt accounts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	2,994,649	615,499
Contracts | Performing accounts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	393,086,994	382,843,130
Contracts | Non-performing accounts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	7,006,565	4,096,963
Direct Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	10,623,932	5,721,768	8,075,902
Direct Loans | Non-bankrupt accounts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	10,614,301	5,721,768
Direct Loans | Bankrupt accounts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	9,631
Direct Loans | Performing accounts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	10,555,451	5,685,981
Direct Loans | Non-performing accounts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 68,481	$ 35,787