Fair Value Disclosures - Summary of financial instruments not measured at fair value (Details 1) (USD $)	Sep. 30, 2013	Mar. 31, 2013
Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Finance receivables
Line of credit
Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Finance receivables
Line of credit	131,000,000	125,500,000
Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Finance receivables	260,494,000	249,826,000
Line of credit
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Finance receivables	260,494,000	249,826,000
Line of credit	$ 131,000,000	$ 125,500,000