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Fair Value Disclosures - Summary of financial instruments not measured at fair value (Details 1) - USD ($)
$ in Thousands
Dec. 31, 2017
Mar. 31, 2017
Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash $ 3,082 $ 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 178,000 213,000
Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash 0 0
Finance receivables 281,358 317,205
Line of credit 0 0
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash 3,082 2,855
Finance receivables 281,358 317,205
Line of credit 178,000 213,000
Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash 3,082 2,855
Finance receivables 281,358 317,205
Line of credit $ 178,000 $ 213,000