Document And Entity Information - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2018	Apr. 27, 2018	Sep. 29, 2017
Document Information [Line Items]
Entity Registrant Name	NVE CORP /NEW/
Entity Central Index Key	0000724910
Trading Symbol	nvec
Current Fiscal Year End Date	--03-31
Entity Filer Category	Accelerated Filer
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Entity Common Stock, Shares Outstanding (in shares)		4,842,010
Entity Public Float			$ 214
Document Type	10-K
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY
Amendment Flag	false