Revenue Recognition (Detail Textuals)	3 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Revenue Recognition and Deferred Revenue [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 earliest. Chapter 13 bankruptcy accounts are accounted for under the cost-recovery method.
Average dealer discount associated with new volume	8.19%	7.56%