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

No definition available.

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

- 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

- 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

- 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

- Details

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

- 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

Finance Receivables (Detail Textuals) (USD $)								6 Months Ended				6 Months Ended
Finance Receivables (Detail Textuals) (USD $)	Sep. 30, 2013	Mar. 31, 2013	Sep. 30, 2012	Sep. 30, 2013 Finance receivables	Mar. 31, 2013 Finance receivables	Sep. 30, 2013 Finance receivables Contracts	Mar. 31, 2013 Finance receivables Contracts	Sep. 30, 2013 Finance receivables Contracts Minimum	Sep. 30, 2013 Finance receivables Contracts Maximum	Sep. 30, 2013 Finance receivables Direct Loans	Mar. 31, 2013 Finance receivables Direct Loans	Sep. 30, 2013 Finance receivables Direct Loans Minimum	Sep. 30, 2013 Finance receivables Direct Loans Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Initial term of the indirect finance receivables								12 months	72 months
Initial term of the direct finance receivables												6 months	48 months
Weighted average interest rate of receivables						23.17%	23.31%			26.05%	25.84%
Finance receivables, net	$ 260,494,081	$ 249,825,801	$ 248,013,051	$ 260,494,081	$ 249,825,801							$ 1,000	$ 8,000
Percentage of direct loan to the total loan portfolio										3.00%