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Fair Value Disclosures - Summary of financial instruments not measured at fair value (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Mar. 31, 2018
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash $ 2,787 $ 2,626
Finance receivables 236,241 267,401
Line of credit 134,200 165,750
Carrying Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash 2,787 2,626
Finance receivables 236,241 266,573
Line of credit 134,200 165,750
Level 1    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash 2,787 2,626
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 134,200 165,750
Level 3    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash 0 0
Finance receivables 236,241 267,401
Line of credit $ 0 $ 0