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Note 11 - Convertible Notes Payable (Details) (USD $)
12 Months Ended 1 Months Ended
Sep. 30, 2013
Jan. 31, 2013
Sep. 30, 2014
Sep. 30, 2012
Apr. 30, 2012
Mar. 31, 2012
Note 11 - Convertible Notes Payable (Details) [Line Items]            
Debt Instrument, Interest Rate, Stated Percentage       6.00%us-gaap_DebtInstrumentInterestRateStatedPercentage    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in Shares) 10,000,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in Dollars per share) $ 0.50us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1   $ 0.50us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1      
Interest Expense, Debt $ 248,000us-gaap_InterestExpenseDebt          
Series E Preferred Stock [Member]            
Note 11 - Convertible Notes Payable (Details) [Line Items]            
Convertible Preferred Stock, Shares Issued upon Conversion (in Shares) 100,000us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember
         
Issuance [Member]            
Note 11 - Convertible Notes Payable (Details) [Line Items]            
Convertible Notes Payable, Noncurrent       1,000,000us-gaap_ConvertibleLongTermNotesPayable
/ us-gaap_DebtConversionByUniqueDescriptionAxis
= nhld_IssuanceMember
700,000us-gaap_ConvertibleLongTermNotesPayable
/ us-gaap_DebtConversionByUniqueDescriptionAxis
= nhld_IssuanceMember
3,300,000us-gaap_ConvertibleLongTermNotesPayable
/ us-gaap_DebtConversionByUniqueDescriptionAxis
= nhld_IssuanceMember
Convertible Notes 6 Percent to Common Stock [Member]            
Note 11 - Convertible Notes Payable (Details) [Line Items]            
Debt Conversion, Converted Instrument, Shares Issued (in Shares)   10,000,000us-gaap_DebtConversionConvertedInstrumentSharesIssued1
/ us-gaap_DebtConversionByUniqueDescriptionAxis
= nhld_ConvertibleNotes6PercentToCommonStockMember
       
Common Shares [Member]            
Note 11 - Convertible Notes Payable (Details) [Line Items]            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in Shares)   6,700,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_DebtConversionByUniqueDescriptionAxis
= nhld_CommonSharesMember
       
Convertible Debt [Member]            
Note 11 - Convertible Notes Payable (Details) [Line Items]            
Debt Instrument, Interest Rate, Stated Percentage   10.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_ShortTermDebtTypeAxis
= us-gaap_ConvertibleDebtMember
       
Six Percent [Member]            
Note 11 - Convertible Notes Payable (Details) [Line Items]            
Debt Instrument, Face Amount   5,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_StatementScenarioAxis
= nhld_SixPercentMember
       
Ten Percent [Member]            
Note 11 - Convertible Notes Payable (Details) [Line Items]            
Debt Instrument, Face Amount   1,800,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= nhld_TenPercentMember