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Note 4 - Business Combination (Details) - Pro Forma Consolidated Results of Operations (USD $)
12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Note 4 - Business Combination (Details) - Pro Forma Consolidated Results of Operations [Line Items]    
Weighted number of shares outstanding - diluted 123,888,863us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 74,887,749us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Gilman Ciocia Inc [Member]    
Note 4 - Business Combination (Details) - Pro Forma Consolidated Results of Operations [Line Items]    
Revenues 185,896,000us-gaap_BusinessAcquisitionsProFormaRevenue
/ us-gaap_BusinessAcquisitionAxis
= nhld_GilmanCiociaIncMember
165,014,000us-gaap_BusinessAcquisitionsProFormaRevenue
/ us-gaap_BusinessAcquisitionAxis
= nhld_GilmanCiociaIncMember
Net Income attributable to common stockholders 18,005,000us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= nhld_GilmanCiociaIncMember
1,120,000us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
/ us-gaap_BusinessAcquisitionAxis
= nhld_GilmanCiociaIncMember
Basic earnings per share 0.15us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic
/ us-gaap_BusinessAcquisitionAxis
= nhld_GilmanCiociaIncMember
0.01us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic
/ us-gaap_BusinessAcquisitionAxis
= nhld_GilmanCiociaIncMember
Diluted earnings per share 0.14us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted
/ us-gaap_BusinessAcquisitionAxis
= nhld_GilmanCiociaIncMember
0.01us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted
/ us-gaap_BusinessAcquisitionAxis
= nhld_GilmanCiociaIncMember
Weighted number of shares outstanding - basic 123,957,988us-gaap_WeightedAverageBasicSharesOutstandingProForma
/ us-gaap_BusinessAcquisitionAxis
= nhld_GilmanCiociaIncMember
102,161,679us-gaap_WeightedAverageBasicSharesOutstandingProForma
/ us-gaap_BusinessAcquisitionAxis
= nhld_GilmanCiociaIncMember
Weighted number of shares outstanding - diluted 124,820,372us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
/ us-gaap_BusinessAcquisitionAxis
= nhld_GilmanCiociaIncMember
106,520,061us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
/ us-gaap_BusinessAcquisitionAxis
= nhld_GilmanCiociaIncMember