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Fair Value Disclosures - Summary of financial instruments not measured at fair value (Details 1) - USD ($)
$ in Thousands
Mar. 31, 2017
Mar. 31, 2016
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash $ 2,855 $ 1,849
Finance receivables 317,205 311,837
Line of credit 213,000 211,000
Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash 2,855 1,849
Finance receivables 317,205 311,837
Line of credit 213,000 211,000
Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash 2,855 1,849
Finance receivables
Line of credit
Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash
Finance receivables
Line of credit 213,000 211,000
Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash
Finance receivables 317,205 311,837
Line of credit