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Fair Value Disclosures - Summary of financial instruments not measured at fair value (Details 1) - USD ($)
$ in Thousands
Mar. 31, 2018
Mar. 31, 2017
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash $ 2,626 $ 2,855
Finance receivables 270,404 317,205
Line of credit 165,750 213,000
Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash 2,626 2,855
Finance receivables 269,876 317,205
Line of credit 165,750 213,000
Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash 2,626 2,855
Finance receivables 0 0
Line of credit 0 0
Level 2    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash 0 0
Finance receivables 0 0
Line of credit 165,750 213,000
Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash 0 0
Finance receivables 270,404 317,205
Line of credit $ 0 $ 0