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Summary of Significant Accounting Policies (Detail Textuals) - USD ($)
 3 Months Ended 12 Months Ended
Jun. 30, 2018
Mar. 31, 2019
Mar. 31, 2018
Accounting Policies [Abstract]      
Increase in marketing expenses   $ 1,000,000  
Allowance for credit losses and provision expense $ 151,000    
Period for maintaining historical write off information with respect to static pool   10 years  
Percentage of liquidation level assist in determining allowance for credit losses for 1st snapshot   20.00%  
Percentage of liquidation level assist in determining allowance for credit losses for 2nd snapshot   40.00%  
Percentage of liquidation level assist in determining allowance for credit losses for 3rd snapshot   60.00%  
Percentage of liquidation level assist in determining allowance for credit losses in 4th snapshot   80.00%  
Percentage of liquidation level assist in determining allowance for credit losses in 5th snapshot   100.00%  
Uncertain tax positions   $ 0 $ 0
Interest income accrual on finance receivables suspension condition   Accrual of interest income on finance receivables is suspended when a loan is contractually delinquent for 61 days or more or the collateral is repossessed, whichever is earlier. As of February 2019, Chapter 13 bankruptcy accounts are charged-off. Prior to February 2019, Chapter 13 bankruptcy accounts were accounted for under the cost-recovery method.  
Average dealer discount associated with new volume   8.20% 7.40%
Monthly servicing fee percent of outstanding financed receivables   2.50%