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Note 16 - Stockholders' Equity (Details) (USD $)
12 Months Ended 1 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Jan. 31, 2013
Sep. 30, 2003
Jul. 12, 2010
Sep. 29, 2010
Sep. 19, 2013
Sep. 30, 2011
Aug. 31, 2013
Feb. 27, 2013
Note 16 - Stockholders' Equity (Details) [Line Items]                    
Common Stock, Shares Authorized 150,000,000us-gaap_CommonStockSharesAuthorized 150,000,000us-gaap_CommonStockSharesAuthorized                
Preferred Stock, Shares Authorized 10,000,000us-gaap_PreferredStockSharesAuthorized 10,000,000us-gaap_PreferredStockSharesAuthorized           10,000,000us-gaap_PreferredStockSharesAuthorized    
Common Stock, Shares, Issued 124,454,783us-gaap_CommonStockSharesIssued 100,580,203us-gaap_CommonStockSharesIssued                
Common Stock, Value, Issued (in Dollars) $ 2,490,000us-gaap_CommonStockValue $ 2,012,000us-gaap_CommonStockValue                
Stock Issued During Period, Value, New Issues (in Dollars) 128,000us-gaap_StockIssuedDuringPeriodValueNewIssues                  
Preferred Stock, Par or Stated Value Per Share (in Dollars per share) $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare                
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Fair Value (in Dollars) 414,000nhld_SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsGrantsinPeriodGrantDateFairValue 838,000nhld_SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsGrantsinPeriodGrantDateFairValue                
Class of Warrant or Right, Outstanding 896,755us-gaap_ClassOfWarrantOrRightOutstanding                  
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per share) $ 0.50us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 $ 0.50us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1                
Warrants and Rights Outstanding (in Dollars) 0us-gaap_WarrantsAndRightsOutstanding                  
Other Receivables (in Dollars) 3,998,000us-gaap_OtherReceivables 1,424,000us-gaap_OtherReceivables                
Expires June 2015 [Member]                    
Note 16 - Stockholders' Equity (Details) [Line Items]                    
Class of Warrant or Right, Outstanding 250,000us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_ClassOfWarrantOrRightAxis
= nhld_ExpiresJune2015Member
                 
Expires July 2015 [Member]                    
Note 16 - Stockholders' Equity (Details) [Line Items]                    
Class of Warrant or Right, Outstanding 646,755us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_ClassOfWarrantOrRightAxis
= nhld_ExpiresJuly2015Member
                 
Convertible Notes Into Series E Preferred Stock [Member] | Series E Holder [Member]                    
Note 16 - Stockholders' Equity (Details) [Line Items]                    
Debt Conversion, Original Debt, Amount (in Dollars)     5,000,000us-gaap_DebtConversionOriginalDebtAmount1
/ us-gaap_CounterpartyNameAxis
= nhld_SeriesEHolderMember
/ us-gaap_DebtConversionByUniqueDescriptionAxis
= nhld_ConvertibleNotesIntoSeriesEPreferredStockMember
             
Preferred Stock, Par or Stated Value Per Share (in Dollars per share)     $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_CounterpartyNameAxis
= nhld_SeriesEHolderMember
/ us-gaap_DebtConversionByUniqueDescriptionAxis
= nhld_ConvertibleNotesIntoSeriesEPreferredStockMember
             
Issuance of Shares of Common Stock Pursuant to Private Placement [Member]                    
Note 16 - Stockholders' Equity (Details) [Line Items]                    
Common Stock, Shares, Issued     29,451,596us-gaap_CommonStockSharesIssued
/ us-gaap_StatementEquityComponentsAxis
= nhld_IssuanceOfSharesOfCommonStockPursuantToPrivatePlacementMember
          10,583,330us-gaap_CommonStockSharesIssued
/ us-gaap_StatementEquityComponentsAxis
= nhld_IssuanceOfSharesOfCommonStockPursuantToPrivatePlacementMember
 
Common Stock, Value, Issued (in Dollars)     8,562,000us-gaap_CommonStockValue
/ us-gaap_StatementEquityComponentsAxis
= nhld_IssuanceOfSharesOfCommonStockPursuantToPrivatePlacementMember
          3,016,000us-gaap_CommonStockValue
/ us-gaap_StatementEquityComponentsAxis
= nhld_IssuanceOfSharesOfCommonStockPursuantToPrivatePlacementMember
 
Liabilities for Customer Settlements [Member]                    
Note 16 - Stockholders' Equity (Details) [Line Items]                    
Stock Issued During Period, Shares, New Issues   1,000,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= nhld_LiabilitiesForCustomerSettlementsMember
               
Stock Issued During Period, Value, New Issues (in Dollars)   313,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= nhld_LiabilitiesForCustomerSettlementsMember
               
Prior to Acquisition [Member] | vFinance Investments [Member]                    
Note 16 - Stockholders' Equity (Details) [Line Items]                    
Escrow Deposit Representing Common Stock       4,500,000nhld_EscrowDepositRepresentingCommonStock
/ dei_LegalEntityAxis
= nhld_vFinanceInvestmentsMember
/ us-gaap_StatementScenarioAxis
= nhld_PriorToAcquisitionMember
           
Escrow Deposit (in Dollars)       250,000us-gaap_EscrowDeposit
/ dei_LegalEntityAxis
= nhld_vFinanceInvestmentsMember
/ us-gaap_StatementScenarioAxis
= nhld_PriorToAcquisitionMember
           
Series A Preferred Stock [Member]                    
Note 16 - Stockholders' Equity (Details) [Line Items]                    
Preferred Stock, Shares Authorized               50,000us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
   
Series C Preferred Stock [Member]                    
Note 16 - Stockholders' Equity (Details) [Line Items]                    
Preferred Stock, Shares Authorized               34,500us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
   
Stock Issued During Period, Shares, New Issues         34,169us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
         
Proceeds from Issuance of Convertible Preferred Stock (in Dollars)         1,700,000us-gaap_ProceedsFromIssuanceOfConvertiblePreferredStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
         
Convertible Preferred Stock, Shares Issued upon Conversion     3,416,691us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
             
Series D Preferred Stock [Member]                    
Note 16 - Stockholders' Equity (Details) [Line Items]                    
Preferred Stock, Shares Authorized               100,000us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
   
Stock Issued During Period, Shares, New Issues           60,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
       
Convertible Preferred Stock, Shares Issued upon Conversion     6,000,000us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
             
Proceeds from Issuance of Preferred Stock and Preference Stock (in Dollars)           3,000,000us-gaap_ProceedsFromIssuanceOfPreferredStockAndPreferenceStock
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
       
Preferred Stock Proceeds Receivable (in Dollars)           1,334,000nhld_PreferredStockProceedsReceivable
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
       
Series E Preferred Stock [Member]                    
Note 16 - Stockholders' Equity (Details) [Line Items]                    
Preferred Stock, Shares Authorized               200,000us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
   
Convertible Preferred Stock, Shares Issued upon Conversion   100,000us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
               
Preferred Stock, Par or Stated Value Per Share (in Dollars per share)                   $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
Escrow Agent [Member]                    
Note 16 - Stockholders' Equity (Details) [Line Items]                    
Other Receivables (in Dollars) 128,000us-gaap_OtherReceivables
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nhld_EscrowAgentMember
                 
Restricted Stock Units (RSUs) [Member] | Represents Fair Market Value of One-Third of the RSU [Member]                    
Note 16 - Stockholders' Equity (Details) [Line Items]                    
Allocated Share-based Compensation Expense (in Dollars) 253,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_NatureOfExpenseAxis
= nhld_RepresentsFairMarketValueOfOneThirdOfTheRSUMember
240,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_NatureOfExpenseAxis
= nhld_RepresentsFairMarketValueOfOneThirdOfTheRSUMember
               
Restricted Stock Units (RSUs) [Member] | Employees [Member]                    
Note 16 - Stockholders' Equity (Details) [Line Items]                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period             1,157,750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_TitleOfIndividualAxis
= nhld_EmployeesMember
     
Restricted Stock Units (RSUs) [Member] | Independent Advisors [Member]                    
Note 16 - Stockholders' Equity (Details) [Line Items]                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period             707,700us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_TitleOfIndividualAxis
= nhld_IndependentAdvisorsMember
     
Restricted Stock Units (RSUs) [Member]                    
Note 16 - Stockholders' Equity (Details) [Line Items]                    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period             1,865,450us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
     
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized (in Dollars) 253,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
                 
Employee Stock Option [Member]                    
Note 16 - Stockholders' Equity (Details) [Line Items]                    
Allocated Share-based Compensation Expense (in Dollars) 871,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
139,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
               
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized (in Dollars) $ 185,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
                 
Series E Preferred Stock Into Common Stock [Member] | Series E Holder [Member]                    
Note 16 - Stockholders' Equity (Details) [Line Items]                    
Conversion of Stock, Shares Issued     10,000,000us-gaap_ConversionOfStockSharesIssued1
/ us-gaap_ConversionOfStockByUniqueDescriptionAxis
= nhld_SeriesEPreferredStockIntoCommonStockMember
/ us-gaap_CounterpartyNameAxis
= nhld_SeriesEHolderMember
             
vFinance Investments [Member]                    
Note 16 - Stockholders' Equity (Details) [Line Items]                    
Post Acquisition Shares of Common Stock       630,000nhld_PostAcquisitionSharesOfCommonStock
/ us-gaap_BusinessAcquisitionAxis
= nhld_vFinanceInvestmentsMember