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Note 4 - Business Combination (Details) (USD $)
0 Months Ended 12 Months Ended
Oct. 15, 2013
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Note 4 - Business Combination (Details) [Line Items]        
Proceeds from Issuance of Private Placement $ 3,016,000us-gaap_ProceedsFromIssuanceOfPrivatePlacement      
Professional Fees1 [Member] | Gilman Ciocia Inc [Member]        
Note 4 - Business Combination (Details) [Line Items]        
Business Combination, Acquisition Related Costs   131,000us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= nhld_GilmanCiociaIncMember
/ us-gaap_IncomeStatementLocationAxis
= nhld_ProfessionalFees1Member
86,000us-gaap_BusinessCombinationAcquisitionRelatedCosts
/ us-gaap_BusinessAcquisitionAxis
= nhld_GilmanCiociaIncMember
/ us-gaap_IncomeStatementLocationAxis
= nhld_ProfessionalFees1Member
 
Private Placement [Member]        
Note 4 - Business Combination (Details) [Line Items]        
Sale of Stock, Number of Shares Issued in Transaction (in Shares) 10,583,330us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember
     
Gilman Ciocia Inc [Member]        
Note 4 - Business Combination (Details) [Line Items]        
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares (in Shares) 22,666,685us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued
/ us-gaap_BusinessAcquisitionAxis
= nhld_GilmanCiociaIncMember
     
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable 8,840,000us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable
/ us-gaap_BusinessAcquisitionAxis
= nhld_GilmanCiociaIncMember
     
Business Acquisition, Percentage of Voting Interests Acquired 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= nhld_GilmanCiociaIncMember
     
Payments to Acquire Businesses, Gross 5,400,000us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= nhld_GilmanCiociaIncMember
     
Noncash or Part Noncash Acquisition, Noncash Financial or Equity Instrument Consideration, Options Issued (in Shares) 1,750,000us-gaap_NoncashOrPartNoncashAcquisitionNoncashFinancialOrEquityInstrumentConsiderationOptionsIssued1
/ us-gaap_BusinessAcquisitionAxis
= nhld_GilmanCiociaIncMember
     
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual       36,562,000us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual
/ us-gaap_BusinessAcquisitionAxis
= nhld_GilmanCiociaIncMember
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual       2,608,000us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual
/ us-gaap_BusinessAcquisitionAxis
= nhld_GilmanCiociaIncMember
Business Combination, Pro Forma Information, Income Tax Expense (Benefit) of Acquiree Since Acquisition Date, Actual       $ (1,809,000)nhld_BusinessCombinationProFormaInformationIncomeTaxExpenseBenefitOfAcquireeSinceAcquisitionDateActual
/ us-gaap_BusinessAcquisitionAxis
= nhld_GilmanCiociaIncMember