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Finance Receivables (Details Textuals 2)	9 Months Ended
	Dec. 31, 2012
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
Criteria for receivable to be delinquent account	120 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

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

- Details

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