| Cover | Mar. 10, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Mar. 10, 2021 |
| Entity File Number | 0-04041 |
| Entity Registrant Name | ALLIED MOTION TECHNOLOGIES INC. |
| Entity Central Index Key | 0000046129 |
| Entity Tax Identification Number | 84-0518115 |
| Entity Incorporation, State or Country Code | CO |
| Entity Address, Address Line One | 495 Commerce Drive |
| Entity Address, City or Town | Amherst |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 14228 |
| City Area Code | 716 |
| Local Phone Number | 242-8634 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common stock |
| Trading Symbol | AMOT |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
