| Cover | Aug. 20, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Sep. 2, 2021 |
| Entity Registrant Name | ADDVANTAGE TECHNOLOGIES GROUP, INC. |
| Entity Incorporation, State or Country Code | OK |
| Entity File Number | 1-10799 |
| Entity Tax Identification Number | 73-1351610 |
| Entity Address, Address Line One | 1430 Bradley Lane |
| Entity Address, Address Line Two | 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Central Index Key | 0000874292 |
| Amendment Flag | false |
| Title of 12(b) Security | Common stock, par value $0.01 |
| Trading Symbol | AEY |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
