Finance Receivables (Detail Textuals 2)	12 Months Ended
Mar. 31, 2013
Receivables [Abstract]
Maximum criteria for receivable to be a performing account	60 days
Minimum criteria for receivable to be a non-performing account	60 days
Criteria for receivable to be delinquent account	120 days

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