Document and Entity Information	3 Months Ended
	Jun. 30, 2011	Jul. 22, 2011
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2011
Entity Registrant Name	NEAH POWER SYSTEMS, INC.
Entity Central Index Key	0001162816
Current Fiscal Year End Date	--09-30
Entity Filer Category	Smaller Reporting Company
Entity Common Stock, Shares Outstanding		124,030,594
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well Known Seasoned Issuer	No
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	Q3