| Document and Entity Information - USD ($) | Dec. 31, 2020 | Apr. 29, 2021 | Jun. 30, 2020 |
| Cover [Abstract] | |||
| Entity Registrant Name | CHEMBIO DIAGNOSTICS, INC. | ||
| Entity Central Index Key | 0001092662 | ||
| Current Fiscal Year End Date | --12-31 | ||
| Document Type | 10-K/A | ||
| Amendment Flag | true | ||
| Amendment Description | We are filing this Amendment No. 1 on Form 10-K/A, or this Amendment, to amend our Annual Report on Form 10‑K for the fiscal year ended December 31, 2020, or the 2020 Form 10‑K, as filed with the Securities and Exchange Commission, or SEC, on March 11, 2021. The principal purpose of this Amendment is to include in Part III the information that was to be incorporated by reference from the proxy statement for our 2021 Annual Stockholder Meeting. This Amendment amends the cover page, Items 10 through 14 of Part III, and Item 15 of Part IV of the 2020 Form 10‑K. In addition, as required by Rule 12b-15 under the Securities Exchange Act of 1934, as amended, or the Securities Exchange Act, new certifications by our principal executive officer and principal financial officer are filed as exhibits to this Amendment. | ||
| Document Annual Report | true | ||
| Document Period End Date | Dec. 31, 2020 | ||
| Document Fiscal Year Focus | 2020 | ||
| Document Fiscal Period Focus | FY | ||
| Document Transition Report | false | ||
| Entity File Number | 001-35569 | ||
| Entity Incorporation, State or Country Code | NV | ||
| 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 | ||
| Title of 12(b) Security | Common Stock, $0.01 par value | ||
| Trading Symbol | CEMI | ||
| Security Exchange Name | NASDAQ | ||
| Entity Well-known Seasoned Issuer | No | ||
| Entity Voluntary Filers | No | ||
| ICFR Auditor Attestation Flag | true | ||
| Entity Current Reporting Status | Yes | ||
| Entity Interactive Data Current | Yes | ||
| Entity Filer Category | Accelerated Filer | ||
| Entity Small Business | true | ||
| Entity Emerging Growth Company | false | ||
| Entity Shell Company | false | ||
| Entity Public Float | $ 63,619,273 | ||
| Entity Common Stock, Shares Outstanding | 20,244,544 |
