Document And Entity Information - shares
 3 Months Ended
Jun. 30, 2021
Jul. 16, 2021
Document Information [Line Items]    
Entity Central Index Key 0000724910  
Entity Registrant Name NVE CORP /NEW/  
Amendment Flag false  
Current Fiscal Year End Date --03-31  
Document Fiscal Period Focus Q1  
Document Fiscal Year Focus 2022  
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2021  
Document Transition Report false  
Entity File Number 000-12196  
Entity Incorporation, State or Country Code MN  
Entity Tax Identification Number 41-1424202  
Entity Address, Address Line One 11409 Valley View Road  
Entity Address, City or Town Eden Prairie  
Entity Address, State or Province MN  
Entity Address, Postal Zip Code 55344  
City Area Code 952  
Local Phone Number 829-9217  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Title of 12(b) Security Common Stock, $0.01 par value  
Trading Symbol NVEC  
Security Exchange Name NASDAQ  
Entity Common Stock, Shares Outstanding   4,833,232