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Revenue Recognition (Detail Textuals)
 3 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Deferred Revenue Disclosure [Abstract]    
Interest income accrual on finance receivables suspension condition Accrual of interest income on finance receivables is suspended when a loan enters bankruptcy status, is contractually delinquent for 61 days or more or the collateral is repossessed, whichever is earlier. Chapter 13 bankruptcy accounts are accounted for under the cost-recovery method.  
Average dealer discount associated with new volume 7.56% 7.15%