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Note 4 - Business Combination (Details) - Intangible Assets Estimated Future Amortization Expense (USD $)
Sep. 30, 2014
Note 4 - Business Combination (Details) - Intangible Assets Estimated Future Amortization Expense [Line Items]  
$ 7,595,000us-gaap_FiniteLivedIntangibleAssetsNet
Gilman Ciocia Inc [Member]  
Note 4 - Business Combination (Details) - Intangible Assets Estimated Future Amortization Expense [Line Items]  
2015 788,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths
/ us-gaap_BusinessAcquisitionAxis
= nhld_GilmanCiociaIncMember
2016 646,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo
/ us-gaap_BusinessAcquisitionAxis
= nhld_GilmanCiociaIncMember
2017 640,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree
/ us-gaap_BusinessAcquisitionAxis
= nhld_GilmanCiociaIncMember
2018 640,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour
/ us-gaap_BusinessAcquisitionAxis
= nhld_GilmanCiociaIncMember
2019 640,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive
/ us-gaap_BusinessAcquisitionAxis
= nhld_GilmanCiociaIncMember
Thereafter 2,587,000us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive
/ us-gaap_BusinessAcquisitionAxis
= nhld_GilmanCiociaIncMember
$ 5,941,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_BusinessAcquisitionAxis
= nhld_GilmanCiociaIncMember