Document And Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2021	Apr. 14, 2022	Jun. 30, 2021
Document Information [Line Items]
Entity Central Index Key	0001653821
Entity Registrant Name	CEN BIOTECH INC
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2021
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2021
Document Transition Report	false
Entity File Number	000-55557
Entity Incorporation, State or Country Code	A6
Entity Address, Address Line One	300-3295 Quality Way
Entity Address, City or Town	Windsor
Entity Address, State or Province	ON
Entity Address, Postal Zip Code	N8T 3R9
City Area Code	519
Local Phone Number	419-4958
Title of 12(g) Security	Common Stock, No Par Value per share
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Shell Company	false
Entity Public Float			$ 13,029,000
Entity Common Stock, Shares Outstanding		56,407,410
Auditor Name	Mazars USA LLP
Auditor Location	New York, New York
Auditor Firm ID	339