Finance Receivables - Assessment of credit quality by creditworthiness (Details 4) (Finance receivables, USD $)	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Contracts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 443,083,009	$ 410,532,221	$ 386,324,595
Finance receivables, gross contract	447,042,854	413,613,292
Contracts | Performing accounts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	438,317,584	405,691,402
Contracts | Non-performing accounts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	4,765,425	4,840,819
Contracts | Chapter 13 bankrupt accounts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	3,959,845	3,081,071
Direct Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	10,911,845	10,704,545	8,781,637
Finance receivables, gross contract	10,931,904	10,730,901
Direct Loans | Performing accounts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	10,855,209	10,656,685
Direct Loans | Non-performing accounts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	56,636	47,860
Direct Loans | Chapter 13 bankrupt accounts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 20,059	$ 26,356