Document And Entity Information - USD ($)
 12 Months Ended
Mar. 31, 2022
Jul. 08, 2022
Document Information [Line Items]    
Entity Central Index Key 0000849401  
Amendment Flag false  
Document Fiscal Year Focus 2022  
Document Fiscal Period Focus FY  
Current Fiscal Year End Date --03-31  
Document Type 10-K  
Document Annual Report true  
Document Period End Date Mar. 31, 2022  
Document Transition Report false  
Entity File Number 0-17629  
Entity Registrant Name ADM TRONICS UNLIMITED, INC.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 22-1896032  
Entity Address, Address Line One 224 Pegasus Avenue  
Entity Address, City or Town Northvale  
Entity Address, State or Province NJ  
Entity Address, Postal Zip Code 07647  
City Area Code 201  
Local Phone Number 767-6040  
Title of 12(g) Security COMMON STOCK, $.0005 PAR VALUE  
Entity Well-known Seasoned Issuer No  
Entity Voluntary Filers No  
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  
ICFR Auditor Attestation Flag false  
Entity Shell Company false  
Entity Public Float $ 4,877,458  
Entity Common Stock, Shares Outstanding   67,588,492
Auditor Name Raich Ende Malter & Co. LLP  
Auditor Location Melville, New York  
Auditor Firm ID 50