Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2021	Apr. 30, 2021
Cover [Abstract]
Entity Registrant Name	Chembio Diagnostics, Inc.
Entity Central Index Key	0001092662
Current Fiscal Year End Date	--12-31
Document Type	10-Q
Amendment Flag	false
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1
Document Transition Report	false
Entity File Number	000-30379
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 Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		20,244,554