| Document and Entity Information | Dec. 03, 2020 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Dec. 3, 2020 |
| Entity Registrant Name | CHEMBIO DIAGNOSTICS, INC. |
| Entity Incorporation, State or Country Code | NV |
| Entity File Number | 0-30379 |
| Entity Tax Identification Number | 88-0425691 |
| Entity Address, Address Line One | 555 Wireless Blvd |
| Entity Address, City or Town | Hauppauge |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 11788 |
| City Area Code | 631 |
| Local Phone Number | 924-1135 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001092662 |
| Title of 12(b) Security | Common Stock, $0.01 par value |
| Trading Symbol | CEMI |
| Security Exchange Name | NASDAQ |
