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Finance Receivables (Details Textuals) (USD $)			6 Months Ended
	Sep. 30, 2012	Mar. 31, 2012	Sep. 30, 2012 Maximum	Sep. 30, 2012 Minimum	Sep. 30, 2012 Finance receivables Contracts	Mar. 31, 2012 Finance receivables Contracts	Sep. 30, 2012 Finance receivables Consumer Loan Maximum	Sep. 30, 2012 Finance receivables Consumer Loan Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Initial term of the indirect finance receivables			72 months	12 months
Initial term of the direct finance receivables			48 months	6 months
Weighted average interest rate of receivables					23.54%	23.58%
Percentage of Direct loan to the total loan portfolio	2.00%
Financing Receivable, Net	$ 249,072,304	$ 242,348,521					$ 8,000	$ 1,000

X

- Definition

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

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix:	us-gaap_
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

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