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Note 4 - Forgivable Loans Receivable (Details) - Forgivable Loan Activity (USD $)
6 Months Ended
Mar. 31, 2015
Sep. 30, 2014
Investments in and Advances to Affiliates [Line Items]    
Balance   $ 3,998,000us-gaap_OtherReceivables
Balance 4,277,000us-gaap_OtherReceivables 3,998,000us-gaap_OtherReceivables
Advances to Registered Representatives [Member]    
Investments in and Advances to Affiliates [Line Items]    
Balance 662,000us-gaap_OtherReceivables
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nhld_AdvancesToRegisteredRepresentativesMember
 
Additions 483,000us-gaap_PaymentsForAdvanceToAffiliate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nhld_AdvancesToRegisteredRepresentativesMember
 
Amortization (149,000)nhld_AmortizationOrRepaymentOfAdvances
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nhld_AdvancesToRegisteredRepresentativesMember
 
Repayments (60,000)us-gaap_ProceedsFromCollectionOfAdvanceToAffiliate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nhld_AdvancesToRegisteredRepresentativesMember
 
Balance $ 936,000us-gaap_OtherReceivables
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= nhld_AdvancesToRegisteredRepresentativesMember