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Fair Value Disclosures (Details 2) (USD $)
Jun. 30, 2012
Mar. 31, 2012
Level 1
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash $ 5,049,384,000 $ 2,803,054
Finance receivables      
Line of credit      
Level 2
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash      
Finance receivables      
Line of credit 109,000,000 112,000,000
Level 3
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash      
Finance receivables 244,600,000 242,350,000
Line of credit      
Fair Value
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash 5,049,384 2,803,054
Finance receivables 244,600,000 242,350,000
Line of credit $ 109,000,000 $ 112,000,000