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Note 13 - Income Taxes (Details) (USD $)
3 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Note 13 - Income Taxes (Details) [Line Items]    
Operating Loss Carryforwards   $ 34,000,000us-gaap_OperatingLossCarryforwards
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount (11,925,000)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount (843,000)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Domestic Tax Authority [Member]    
Note 13 - Income Taxes (Details) [Line Items]    
Operating Loss Carryforwards 32,000,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
 
State and Local Jurisdiction [Member]    
Note 13 - Income Taxes (Details) [Line Items]    
Operating Loss Carryforwards 7,000,000us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_StateAndLocalJurisdictionMember
 
Gilman Ciocia Inc [Member]    
Note 13 - Income Taxes (Details) [Line Items]    
Operating Loss Carryforwards 7,000,000us-gaap_OperatingLossCarryforwards
/ us-gaap_BusinessAcquisitionAxis
= nhld_GilmanCiociaIncMember
 
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount $ (1,809,000)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
/ us-gaap_BusinessAcquisitionAxis
= nhld_GilmanCiociaIncMember