Cover Page - shares	6 Months Ended
	Mar. 31, 2021	May 12, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2021
Document Transition Report	false
Entity File Number	1-10799
Entity Registrant Name	ADDvantage Technologies Group, Inc.
Entity Incorporation, State or Country Code	OK
Entity Tax Identification Number	73-1351610
Entity Address, Address Line One	1430 Bradley Lane, Suite 196
Entity Address, City or Town	Carrollton
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	75007
City Area Code	(918)
Local Phone Number	251-9121
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
Entity Common Stock, Shares Outstanding		12,413,372
Current Fiscal Year End Date	--09-30
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2
Entity Central Index Key	0000874292
Amendment Flag	false