ORGANIZATION AND DESCRIPTION OF BUSINESS	6 Months Ended
Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
ORGANIZATION AND DESCRIPTION OF BUSINESS	ORGANIZATION AND DESCRIPTION OF BUSINESS National Holdings Corporation (“National” or the “Company”), a Delaware corporation organized in 1996, operates through its wholly owned subsidiaries which principally provide financial services. Through its broker-dealer and investment advisory subsidiaries, the Company (1) offers full service retail brokerage and investment advisory services to individual, corporate and institutional clients, (2) provides investment banking, merger, acquisition and advisory services to micro, small and mid-cap high growth companies and (3) engages in trading securities, including making markets in micro and small-cap, NASDAQ and other exchange listed stocks. The Company's broker-dealer subsidiary is National Securities Corporation, a Washington corporation (“NSC”). NSC conducts a national securities brokerage business through its main offices in New York City, New York, Boca Raton, Florida, and Seattle, Washington. NSC is an introducing broker and clears all transactions through clearing organizations, on a fully disclosed basis. NSC is registered with the Securities and Exchange Commission ("SEC") and is a member of the Financial Industry Regulatory Authority ("FINRA") and the Securities Investor Protection Corporation (the “SIPC”). Our wholly-owned subsidiary, National Asset Management, Inc., a Washington corporation ("NAM"), is a federally-registered investment adviser providing asset management advisory services to retail clients for a fee based upon a percentage of assets managed. Our wholly-owned subsidiaries, National Insurance Corporation, a Washington corporation ("National Insurance") and Prime Financial Services, a Delaware corporation (“Prime Financial”), provide fixed insurance products to their clients, including life insurance, disability insurance, long term care insurance and fixed annuities. Our wholly-owned subsidiary, Gilman Ciocia, Inc. (“Gilman”), provides tax preparation and accounting services to individuals and small to midsize companies. In December 2018, Gilman changed its name to National Tax and Financial Services, Inc. (“National Tax”). Our wholly-owned subsidiary, GC Capital Corporation ("GC"), provides licensed mortgage brokerage services in New York and Florida.

ORGANIZATION AND DESCRIPTION OF BUSINESS

National Holdings Corporation (“National” or the “Company”), a Delaware corporation organized in 1996, operates through its wholly owned subsidiaries which principally provide financial services. Through its broker-dealer and investment advisory subsidiaries, the Company (1) offers full service retail brokerage and investment advisory services to individual, corporate and institutional clients, (2) provides investment banking, merger, acquisition and advisory services to micro, small and mid-cap high growth companies and (3) engages in trading securities, including making markets in micro and small-cap, NASDAQ and other exchange listed stocks.

The Company's broker-dealer subsidiary is National Securities Corporation, a Washington corporation (“NSC”). NSC conducts a national securities brokerage business through its main offices in New York City, New York, Boca Raton, Florida, and Seattle, Washington. NSC is an introducing broker and clears all transactions through clearing organizations, on a fully disclosed basis. NSC is registered with the Securities and Exchange Commission ("SEC") and is a member of the Financial Industry Regulatory Authority ("FINRA") and the Securities Investor Protection Corporation (the “SIPC”).

Our wholly-owned subsidiary, National Asset Management, Inc., a Washington corporation ("NAM"), is a federally-registered investment adviser providing asset management advisory services to retail clients for a fee based upon a percentage of assets managed.

Our wholly-owned subsidiaries, National Insurance Corporation, a Washington corporation ("National Insurance") and Prime Financial Services, a Delaware corporation (“Prime Financial”), provide fixed insurance products to their clients, including life insurance, disability insurance, long term care insurance and fixed annuities.

Our wholly-owned subsidiary, Gilman Ciocia, Inc. (“Gilman”), provides tax preparation and accounting services to individuals and small to midsize companies. In December 2018, Gilman changed its name to National Tax and Financial Services, Inc. (“National Tax”).

Our wholly-owned subsidiary, GC Capital Corporation ("GC"), provides licensed mortgage brokerage services in New York and Florida.