Note 2 - Summary of Significant Accounting Policies (Details) (USD $)	12 Months Ended
Sep. 30, 2014	Sep. 30, 2013
Accounting Policies [Abstract]
Noncontrolling Interest, Ownership Percentage by Parent	24.90%
Deferred Clearing Rebate	$ 134,000nhld_DeferredClearingRebate	$ 113,000nhld_DeferredClearingRebate
Other Payables to Broker-Dealers and Clearing Organizations	$ 971,000	$ 138,000

Amount of other payables due to broker-dealers or clearing organizations.

No definition available.

Name:	us-gaap_OtherPayablesToBrokerDealersAndClearingOrganizations
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant