Document And Entity Information - shares
 9 Months Ended
Dec. 31, 2018
Jan. 18, 2019
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 Emerging Growth Company false  
Entity Small Business true  
Entity Common Stock, Shares Outstanding (in shares)   4,846,010
Document Type 10-Q  
Document Period End Date Dec. 31, 2018  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q3  
Amendment Flag false