Cover - USD ($)	12 Months Ended
	Sep. 30, 2020	Dec. 15, 2020	Mar. 31, 2020
Cover [Abstract]
Entity Registrant Name	ADDVANTAGE TECHNOLOGIES GROUP INC
Entity Central Index Key	0000874292
Entity File Number	1-10799
Entity Tax Identification Number	73-1351610
Trading Symbol	aey
Current Fiscal Year End Date	--09-30
Entity Filer Category	Non-accelerated Filer
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	No
Entity Interactive Data Current	Yes
Entity Emerging Growth Company	false
Entity Small Business	true
Document Transition Report	false
Document Annual Report	true
City Area Code	(918)
Local Phone Number	251-9121
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
Entity Incorporation, State or Country Code	OK
Entity Common Stock, Shares Outstanding		12,031,380
Entity Public Float			$ 9,977,537
Entity Shell Company	false
Document Type	10-K
Document Period End Date	Sep. 30, 2020
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Amendment Flag	false
Title of 12(b) Security	Common Stock, $.01 par value