Organization and Description of Business (Details)	Nov. 22, 2013 entity
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of entities involved in transfer of brokers and customer accounts	2

Number of Entities Involved in Transfer of Brokers and Customer Accounts

No definition available.

Name:	nhld_NumberofEntitiesInvolvedinTransferofBrokersandCustomerAccounts
Namespace Prefix:	nhld_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant