Document And Entity Information (USD $)	12 Months Ended
	Sep. 30, 2012	Dec. 21, 2012	Mar. 31, 2012
Document and Entity Information [Abstract]
Entity Registrant Name	NEAH POWER SYSTEMS, INC.
Document Type	10-K
Current Fiscal Year End Date	--09-30
Entity Common Stock, Shares Outstanding		529,681,022
Entity Public Float			$ 2,097,953
Amendment Flag	false
Entity Central Index Key	0001162816
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Smaller Reporting Company
Entity Well-known Seasoned Issuer	No
Document Period End Date	Sep. 30, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	FY