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Finance Receivables (Details Textuals) (USD $)			3 Months Ended						9 Months Ended			9 Months Ended
	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2012 Contracts Maximum	Dec. 31, 2012 Contracts Minimum	Dec. 31, 2012 Direct Loans Maximum	Dec. 31, 2012 Direct Loans Minimum	Dec. 31, 2012 Finance receivables Contracts	Mar. 31, 2012 Finance receivables Contracts	Dec. 31, 2012 Finance receivables Contracts Maximum	Dec. 31, 2012 Finance receivables Contracts Minimum	Dec. 31, 2012 Finance receivables Direct Loans	Dec. 31, 2012 Finance receivables Direct Loans Maximum	Dec. 31, 2012 Finance receivables Direct Loans Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Initial term of the indirect finance receivables			72 months	12 months					72 months	12 months
Initial term of the direct finance receivables					48 months	6 months						48 months	6 months
Weighted average interest rate of receivables							23.45%	23.58%
Finance receivables, net	$ 246,342,674	$ 242,348,521										$ 8,000	$ 1,000
Percentage of Direct loan to the total loan portfolio											2.00%

X

- Definition

This item represents the percentage of the direct loan in the total loan portfolio.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

X

- Definition

Reflects the calculation as of the balance sheet date of the average interest rate weighted by the amount of finance receivables by type or by instrument at that time.

+ References

No definition available.

+ Details

Name:	nick_FinanceReceivablesWeightedAverageInterestRate
Namespace Prefix:	nick_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

This item represents initial term of direct finance receivables.

+ References

No definition available.

+ Details

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

X

- Definition

This item represents initial term of indirect finance receivables.

+ References

No definition available.

+ Details

Name:	nick_InitialTermsOfIndirectFinanceReceivables
Namespace Prefix:	nick_
Data Type:	xbrli:durationItemType
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X

- Details

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

X

- Definition

Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.3)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 3

-Article 5

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant