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Finance Receivables - Assessment of credit quality by creditworthiness (Details 4) (Finance receivables, USD $) | Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
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Contracts |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | $ 443,083,009 nick_NotesReceivableGrossAmountExcludingChapter13BankruptAccounts / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FinanceReceivablesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CustomerContractsMember | $ 410,532,221 nick_NotesReceivableGrossAmountExcludingChapter13BankruptAccounts / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FinanceReceivablesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CustomerContractsMember | $ 386,324,595 nick_NotesReceivableGrossAmountExcludingChapter13BankruptAccounts / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FinanceReceivablesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CustomerContractsMember
Finance receivables, gross contract | 447,042,854 nick_NotesReceivableGrossAmountIncludingChapter13BankruptAccounts / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FinanceReceivablesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CustomerContractsMember | 413,613,292 nick_NotesReceivableGrossAmountIncludingChapter13BankruptAccounts / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FinanceReceivablesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CustomerContractsMember |
Contracts | Performing accounts |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 438,317,584 nick_NotesReceivableGrossAmountExcludingChapter13BankruptAccounts / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FinanceReceivablesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CustomerContractsMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember | 405,691,402 nick_NotesReceivableGrossAmountExcludingChapter13BankruptAccounts / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FinanceReceivablesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CustomerContractsMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember |
Contracts | Non-performing accounts |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 4,765,425 nick_NotesReceivableGrossAmountExcludingChapter13BankruptAccounts / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FinanceReceivablesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CustomerContractsMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember | 4,840,819 nick_NotesReceivableGrossAmountExcludingChapter13BankruptAccounts / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FinanceReceivablesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CustomerContractsMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember |
Contracts | Chapter 13 bankrupt accounts |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 3,959,845 nick_NotesReceivableGrossAmountExcludingChapter13BankruptAccounts / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FinanceReceivablesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CustomerContractsMember / us-gaap_InternalCreditAssessmentAxis = nick_BankruptAccountsFinancingReceivableMember | 3,081,071 nick_NotesReceivableGrossAmountExcludingChapter13BankruptAccounts / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FinanceReceivablesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CustomerContractsMember / us-gaap_InternalCreditAssessmentAxis = nick_BankruptAccountsFinancingReceivableMember |
Direct Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 10,911,845 nick_NotesReceivableGrossAmountExcludingChapter13BankruptAccounts / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FinanceReceivablesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerLoanMember | 10,704,545 nick_NotesReceivableGrossAmountExcludingChapter13BankruptAccounts / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FinanceReceivablesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerLoanMember | 8,781,637 nick_NotesReceivableGrossAmountExcludingChapter13BankruptAccounts / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FinanceReceivablesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerLoanMember
Finance receivables, gross contract | 10,931,904 nick_NotesReceivableGrossAmountIncludingChapter13BankruptAccounts / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FinanceReceivablesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerLoanMember | 10,730,901 nick_NotesReceivableGrossAmountIncludingChapter13BankruptAccounts / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FinanceReceivablesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerLoanMember |
Direct Loans | Performing accounts |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 10,855,209 nick_NotesReceivableGrossAmountExcludingChapter13BankruptAccounts / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FinanceReceivablesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerLoanMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember | 10,656,685 nick_NotesReceivableGrossAmountExcludingChapter13BankruptAccounts / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FinanceReceivablesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerLoanMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_PerformingFinancingReceivableMember |
Direct Loans | Non-performing accounts |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | 56,636 nick_NotesReceivableGrossAmountExcludingChapter13BankruptAccounts / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FinanceReceivablesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerLoanMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember | 47,860 nick_NotesReceivableGrossAmountExcludingChapter13BankruptAccounts / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FinanceReceivablesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerLoanMember / us-gaap_InternalCreditAssessmentAxis = us-gaap_NonperformingFinancingReceivableMember |
Direct Loans | Chapter 13 bankrupt accounts |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total | $ 20,059 nick_NotesReceivableGrossAmountExcludingChapter13BankruptAccounts / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FinanceReceivablesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerLoanMember / us-gaap_InternalCreditAssessmentAxis = nick_BankruptAccountsFinancingReceivableMember | $ 26,356 nick_NotesReceivableGrossAmountExcludingChapter13BankruptAccounts / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FinanceReceivablesMember / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_ConsumerLoanMember / us-gaap_InternalCreditAssessmentAxis = nick_BankruptAccountsFinancingReceivableMember |

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