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Variable Interest Entity (Detail Textuals)	6 Months Ended
	Sep. 30, 2021 USD ($)
Variable Interest Entity [Abstract]
Monthly servicing fee percent of outstanding financed receivables	2.50%
Recourse to assets	$ 0

X

- Definition

Variable interest entity.

+ References

No definition available.

+ Details

Name:	nick_VariableInterestEntityAbstract
Namespace Prefix:	nick_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Variable interest entity monthly servicing fee percent of outstanding financed receivables.

+ References

No definition available.

+ Details

Name:	nick_VariableInterestEntityMonthlyServicingFeePercentOfOutstandingFinancedReceivables
Namespace Prefix:	nick_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Variable interest entity recourse to assets.

+ References

No definition available.

+ Details

Name:	nick_VariableInterestEntityRecourseToAssets
Namespace Prefix:	nick_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant