Document and Entity Information (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Mar. 31, 2012	Apr. 27, 2012	Sep. 30, 2011
Document and Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Mar. 31, 2012
Document Fiscal Period Focus	Q4
Document Fiscal Year Focus	2012
Entity Registrant Name	NVE CORP /NEW/
Entity Central Index Key	0000724910
Current Fiscal Year End Date	--03-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		4,824,745
Entity Current Reporting Status	Yes
Entity Public Float			$ 205
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No