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Note 4 - Business Combination (Details) - Intangible Assets Subject to Amortization (USD $)
12 Months Ended
Sep. 30, 2014
Acquired Finite-Lived Intangible Assets [Line Items]  
Preliminary Fair Value $ 8,350,000us-gaap_FiniteLivedIntangibleAssetsFairValueDisclosure
Accumulated Amortization 755,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Carrying Value 7,595,000us-gaap_FiniteLivedIntangibleAssetsNet
Customer Relationships [Member]  
Acquired Finite-Lived Intangible Assets [Line Items]  
Preliminary Fair Value 6,400,000us-gaap_FiniteLivedIntangibleAssetsFairValueDisclosure
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Accumulated Amortization 613,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Carrying Value 5,787,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerRelationshipsMember
Estimated Useful Life (years) 10 years
Non-compete [Member]  
Acquired Finite-Lived Intangible Assets [Line Items]  
Preliminary Fair Value 296,000us-gaap_FiniteLivedIntangibleAssetsFairValueDisclosure
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= nhld_NoncompeteMember
Accumulated Amortization 142,000us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= nhld_NoncompeteMember
Carrying Value 154,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= nhld_NoncompeteMember
Estimated Useful Life (years) 2 years
Brand [Member]  
Acquired Finite-Lived Intangible Assets [Line Items]  
Preliminary Fair Value 1,654,000us-gaap_FiniteLivedIntangibleAssetsFairValueDisclosure
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= nhld_BrandMember
Carrying Value $ 1,654,000us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= nhld_BrandMember
Estimated Useful Life (years)