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Consolidated Statement of Changes in Stockholders' Equity (USD $)
Series C Preferred Stock [Member]
USD ($)
Series C Preferred Stock [Member]
Common Stock [Member]
USD ($)
Series C Preferred Stock [Member]
Additional Paid-in Capital [Member]
USD ($)
Series C Preferred Stock [Member]
Series D Preferred Stock [Member]
USD ($)
Series D Preferred Stock [Member]
Common Stock [Member]
USD ($)
Series D Preferred Stock [Member]
Additional Paid-in Capital [Member]
USD ($)
Series D Preferred Stock [Member]
Private Placement [Member]
Common Stock [Member]
USD ($)
Private Placement [Member]
Additional Paid-in Capital [Member]
USD ($)
Private Placement [Member]
USD ($)
Series C Preferred Stock [Member]
USD ($)
Series D Preferred Stock [Member]
USD ($)
Common Stock [Member]
Series E Subordinated Note to Common Stock [Member]
USD ($)
Common Stock [Member]
USD ($)
Additional Paid-in Capital [Member]
Series E Subordinated Note to Common Stock [Member]
USD ($)
Additional Paid-in Capital [Member]
USD ($)
Retained Earnings [Member]
USD ($)
Noncontrolling Interest [Member]
USD ($)
Series E Subordinated Note to Common Stock [Member]
USD ($)
Total
USD ($)
BALANCE at Sep. 30, 2012                       $ 2,551,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_SeriesCPreferredStockMember
$ 3,605,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_SeriesDPreferredStockMember
  $ 531,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
  $ 46,184,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ (55,780,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ 18,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
  $ (2,891,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
BALANCE (in Shares) at Sep. 30, 2012                       34,169us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_SeriesCPreferredStockMember
60,000us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_SeriesDPreferredStockMember
  26,555,572us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
           
Issuance of shares of common stock pursuant to the conversion (2,551,000)us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_SeriesCPreferredStockMember
68,000us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
2,483,000us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
  3,605,000us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_SeriesDPreferredStockMember
120,000us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
3,485,000us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
            200,000us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_StatementScenarioAxis
= nhld_SeriesESubordinatedNotetoCommonStockMember
  4,800,000us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
/ us-gaap_StatementScenarioAxis
= nhld_SeriesESubordinatedNotetoCommonStockMember
      5,000,000us-gaap_StockIssuedDuringPeriodValueConversionOfConvertibleSecurities
/ us-gaap_StatementScenarioAxis
= nhld_SeriesESubordinatedNotetoCommonStockMember
 
Issuance of shares of common stock pursuant to the conversion (in Shares) (34,169)us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_SeriesCPreferredStockMember
3,416,691us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
    (60,000)us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_SeriesDPreferredStockMember
6,000,000us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesDPreferredStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
              10,000,000us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_StatementScenarioAxis
= nhld_SeriesESubordinatedNotetoCommonStockMember
             
Issuance of shares of common stock pursuant to the conversion of certain outstanding Warrants                             259,000us-gaap_StockAndWarrantsIssuedDuringPeriodValuePreferredStockAndWarrants
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
  (259,000)us-gaap_StockAndWarrantsIssuedDuringPeriodValuePreferredStockAndWarrants
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
       
Issuance of shares of common stock pursuant to the conversion of certain outstanding Warrants (in Shares)                             12,951,195us-gaap_DebtConversionConvertedInstrumentWarrantsOrOptionsIssued1
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
           
Issuance of shares                 801,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember
10,777,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember
11,578,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember
                   
Issuance of shares (in Shares)                 40,034,928us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember
                       
Issuance of shares of common stock and related stock-based compensation for restricted stock units                             13,000us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
  227,000us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
      240,000us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Issuance of shares of common stock and related stock-based compensation for restricted stock units (in Shares)                             621,817us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
           
Issuance of shares of common stock to satisfy certain liabilities                             20,000us-gaap_StockIssuedDuringPeriodValueOther
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
  293,000us-gaap_StockIssuedDuringPeriodValueOther
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
      313,000us-gaap_StockIssuedDuringPeriodValueOther
Issuance of shares of common stock to satisfy certain liabilities (in Shares)                             1,000,000us-gaap_StockIssuedDuringPeriodSharesOther
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
           
Accrue for distribution of remaining equity to non-controlling equity holder                                 (147,000)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
      (147,000)us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders
Stock-based compensation - stock options                                 139,000us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
      139,000us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition
Net income/loss                                   1,568,000us-gaap_ProfitLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(3,000)us-gaap_ProfitLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
  1,565,000us-gaap_ProfitLoss
BALANCE at Sep. 30, 2013                             2,012,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
  67,982,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
(54,212,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
15,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
  15,797,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
BALANCE (in Shares) at Sep. 30, 2013                             100,580,203us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
           
Issuance of shares                             13,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
  115,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
      128,000us-gaap_StockIssuedDuringPeriodValueNewIssues
Issuance of shares (in Shares)                             630,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
           
Issuance of shares of common stock and related stock-based compensation for restricted stock units                             12,000us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
  241,000us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
      253,000us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised
Issuance of shares of common stock and related stock-based compensation for restricted stock units (in Shares)                             577,895us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
           
Issuance of shares of common stock pursuant to the acquisition of Gilman & Ciocia, Inc.                             453,000us-gaap_StockIssuedDuringPeriodValueAcquisitions
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
  8,387,000us-gaap_StockIssuedDuringPeriodValueAcquisitions
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
      8,840,000us-gaap_StockIssuedDuringPeriodValueAcquisitions
Issuance of shares of common stock pursuant to the acquisition of Gilman & Ciocia, Inc. (in Shares)                             22,666,685us-gaap_StockIssuedDuringPeriodSharesAcquisitions
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
           
Stock-based compensation - stock options                                 871,000us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
      871,000us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition
Net income/loss                                   18,643,000us-gaap_ProfitLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
    18,643,000us-gaap_ProfitLoss
BALANCE at Sep. 30, 2014                             $ 2,490,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
  $ 77,596,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ (35,569,000)us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ 15,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_NoncontrollingInterestMember
  $ 44,532,000us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
BALANCE (in Shares) at Sep. 30, 2014                             124,454,783us-gaap_SharesIssued
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember