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Note 7 - Business Combination (Details) - Assets Acquired and Liabilities Assumed (USD $)
Mar. 31, 2015
Sep. 30, 2014
Oct. 15, 2013
Note 7 - Business Combination (Details) - Assets Acquired and Liabilities Assumed [Line Items]      
Goodwill $ 6,531,000us-gaap_Goodwill $ 6,531,000us-gaap_Goodwill  
Gilman Ciocia Inc [Member]      
Note 7 - Business Combination (Details) - Assets Acquired and Liabilities Assumed [Line Items]      
Current assets     4,833,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= nhld_GilmanCiociaIncMember
Fixed assets     482,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= nhld_GilmanCiociaIncMember
Other assets     272,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= nhld_GilmanCiociaIncMember
Intangible assets     8,350,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= nhld_GilmanCiociaIncMember
Goodwill     6,531,000us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= nhld_GilmanCiociaIncMember
Total Assets     20,468,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets
/ us-gaap_BusinessAcquisitionAxis
= nhld_GilmanCiociaIncMember
Current liabilities     6,000,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities
/ us-gaap_BusinessAcquisitionAxis
= nhld_GilmanCiociaIncMember
Long-term liabilities     5,628,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilities
/ us-gaap_BusinessAcquisitionAxis
= nhld_GilmanCiociaIncMember
Total Liabilities     11,628,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= nhld_GilmanCiociaIncMember
Purchase Price     $ 8,840,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= nhld_GilmanCiociaIncMember