Document And Entity Information - shares	Jun. 30, 2021	Aug. 12, 2021
Document Information [Line Items]
Entity, Registrant Name	CEN BIOTECH, INC.
Document, Type	10-Q/A
Document, Quarterly Report	true
Document, Period End Date	Jun. 30, 2021
Current Fiscal Year End Date	--12-31
Document, Fiscal Period Focus	Q2
Document, Fiscal Year Focus	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, Country	CA
Entity, Address, Postal Zip Code	N8T 3R9
City Area Code	519
Local Phone Number	419-4958
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, Common Stock Shares, Outstanding		47,673,933
Amendment Description	Form 10-Q/A, Amendment No. 1 period ended 06-30-21
Amendment Flag	true
Entity, Central Index Key	0001653821