Document And Entity Information - USD ($)	12 Months Ended
	Mar. 31, 2019	Jul. 15, 2019	Sep. 30, 2018
Document Information [Line Items]
Entity Registrant Name	ADM TRONICS UNLIMITED, INC.
Entity Central Index Key	0000849401
Trading Symbol	admt
Current Fiscal Year End Date	--03-31
Entity Filer Category	Non-accelerated Filer
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Entity Emerging Growth Company	false
Entity Small Business	true
Entity Common Stock, Shares Outstanding (in shares)		67,588,492
Entity Public Float			$ 11,490,044
Entity Shell Company	false
Document Type	10-K/A
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Amendment Flag	true
Amendment Description	This Amendment No. 1 on Form 10-K/A ("Amendment No. 1") is being filed to amend our Annual Report on Form 10-K for the fiscal year ended March 31, 2019 ("Original Form 10-K"), filed with the U.S. Securities and Exchange Commission on July 15, 2019 ("Original Filing Date"). The purpose of this Amendment No. 1 is to file the updated XBRL Exhibit that was not ready for filing when the original 10-K was filed. As required by the rules of the SEC, this Amendment No. 1 sets forth an amended "Item 15. Exhibits and Financial Statement Schedules" in its entirety. Except as described above, this Amendment No. 1 does not modify or update in any way the financial position, results of operations, cash flows or other disclosures in, or exhibits to, the Original Form 10-K, nor does it reflect events occurring after the filing of the Original Form 10-K. Accordingly, this Amendment No. 1 should be read in conjunction with the Original Form 10-K.