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Fair Value Disclosures - Summary of financial instruments not measured at fair value (Details 1) - USD ($)
$ in Thousands
Jun. 30, 2017
Mar. 31, 2017
Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash $ 7,717 $ 2,855
Finance receivables
Line of credit
Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash
Finance receivables
Line of credit 204,000 213,000
Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash
Finance receivables 303,531 317,205
Line of credit
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash 7,717 2,855
Finance receivables 303,531 317,205
Line of credit 204,000 213,000
Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash 7,717 2,855
Finance receivables 303,531 317,205
Line of credit $ 204,000 $ 213,000