Finance Receivables (Detail Textuals 1) - USD ($)	3 Months Ended
Jun. 30, 2018	Jun. 30, 2017
Receivables [Abstract]
Maximum criteria for receivable to be a performing account	61 days
Minimum criteria for receivable to be a non-performing account	61 days
Percentage of more than payment contractually for delinquent	25.00%
Criteria for receivable to be delinquent account	180 days
Troubled debt restructuring allowance for credit losses	$ 750,000	$ 0

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

No definition available.

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

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

No definition available.

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

Represents percentage of payment contractually for delinquent.

No definition available.

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

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

No definition available.

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

Represents information about Troubled Debt Restructuring Allowance For Credit Losses.

No definition available.

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

No definition available.

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