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Finance Receivables (Detail Textuals 1) - USD ($)		9 Months Ended
	Feb. 28, 2019	Dec. 31, 2020	Dec. 31, 2019
Accounts Notes And Loans Receivable [Line Items]
Maximum criteria for receivable to be a performing account		61 days
Percentage of more than payment contractually for delinquent		25.00%
Minimum criteria for receivable to be a non-performing account		61 days
Troubled debt restructuring allowance for credit losses		$ 118,000	$ 0
Minimum
Accounts Notes And Loans Receivable [Line Items]
Criteria for receivable to be delinquent account	121 days

X

- Definition

This element represents the number of days after which the receivable account is considered as delinquent account which will be written off.

+ References

No definition available.

+ Details

Name:	nick_DelinquentAccountCriteriaPeriod
Namespace Prefix:	nick_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

This element represents the number of days after which the receivable account is considered as non- performing account.

+ References

No definition available.

+ Details

Name:	nick_NonPerformingAccountCriteriaMinimumPeriod
Namespace Prefix:	nick_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents percentage of payment contractually for delinquent.

+ References

No definition available.

+ Details

Name:	nick_PercentageOfPaymentContractuallyForDelinquent
Namespace Prefix:	nick_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

This element represents the number of days before which the receivable account is considered as performing account.

+ References

No definition available.

+ Details

Name:	nick_PerformingAccountCriteriaMaximumPeriod
Namespace Prefix:	nick_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents information about Troubled Debt Restructuring Allowance For Credit Losses.

+ References

No definition available.

+ Details

Name:	nick_TroubledDebtRestructuringsAllowanceForCreditLosses
Namespace Prefix:	nick_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: