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Fair Value Disclosures - Summary of financial instruments not measured at fair value (Details 1) (USD $)
Jun. 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 126,021,510 125,500,000
Level 3
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Finance receivables 255,257,992 249,825,801
Line of credit      
Fair Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Finance receivables 255,257,992 249,825,801
Line of credit $ 126,021,510 $ 125,500,000