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Finance Receivables (Detail Textuals) (USD $)	9 Months Ended
	Dec. 31, 2014	Mar. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Finance receivables, net	282,845,253us-gaap_NotesReceivableNet	$ 269,343,595us-gaap_NotesReceivableNet
Finance receivables | Contracts
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted average effective interest rate	22.93%nick_FinanceReceivablesWeightedAverageInterestRate / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FinanceReceivablesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CustomerContractsMember	23.08%nick_FinanceReceivablesWeightedAverageInterestRate / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FinanceReceivablesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CustomerContractsMember
Finance receivables | Contracts | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Initial term of finance receivables	12 months
Finance receivables | Contracts | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Initial term of finance receivables	72 months
Finance receivables | Direct Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted average effective interest rate	26.33%nick_FinanceReceivablesWeightedAverageInterestRate / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FinanceReceivablesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerLoanMember	26.32%nick_FinanceReceivablesWeightedAverageInterestRate / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FinanceReceivablesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerLoanMember
Percentage of direct loan to aggregate principal amount of loan portfolio	3.00%nick_FinanceReceivablesPercentage / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FinanceReceivablesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerLoanMember
Finance receivables | Direct Loans | Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Initial term of finance receivables	6 months
Finance receivables, net	1,000us-gaap_NotesReceivableNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FinanceReceivablesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerLoanMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Finance receivables | Direct Loans | Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Initial term of finance receivables	48 months
Finance receivables, net	8,000us-gaap_NotesReceivableNet / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FinanceReceivablesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerLoanMember / us-gaap_RangeAxis = us-gaap_MaximumMember

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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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

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Period Type:	instant

X

- Definition

This item represents initial term of finance receivables.

+ References

No definition available.

+ Details

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- Details

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Balance Type:	na
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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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Balance Type:	debit
Period Type:	instant

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