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Revenue Recognition (Detail Textuals)	3 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Deferred Revenue Disclosure [Abstract]
Average dealer discount associated with new volume	8.19%	8.35%

X

- Definition

This element represents the percentage of finance receivable interest discount.

+ References

No definition available.

+ Details

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

X

- Details

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