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Note 13 - Related Party Transactions (Details Textual)				1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
Note 13 - Related Party Transactions (Details Textual)	Sep. 01, 2022 CAD ($)	Oct. 01, 2017 CAD ($)	Sep. 01, 2013 CAD ($)	Jan. 31, 2017 CAD ($)	Sep. 30, 2019 USD ($) a	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) a	Sep. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 03, 2019	Jun. 30, 2019	May 20, 2019	Dec. 31, 2018 USD ($)	Dec. 03, 2017	Dec. 02, 2017	Jul. 12, 2017	Jan. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Operating Lease, Right-of-Use Asset					$ 236,307		$ 236,307
Operating Lease, Weighted Average Remaining Lease Term					6 years 182 days		6 years 182 days
Operating Lease, Weighted Average Discount Rate, Percent					8.00%		8.00%
Lease Arrangement, 20 North Rear Road [Member]
Area of Land \| a					10.4		10.4
Operating Lease Annual Rent			$ 339,000
Accrued Rent																		$ 552,934
Operating Lease, Monthly Rent				$ 4,000
Lessee, Operating Lease, Term of Contract																	5 years
Operating Lease, Right-of-Use Asset					$ 74,902		$ 74,902
Operating Lease, Liability, Total					71,882		71,882
Lessee, Operating Lease, Discount Rate											8.00%
Lease Arrangement, 20 North Rear Road [Member] \| General and Administrative Expense [Member]
Operating Lease, Expense					9,098	$ 22,846	24,190	$ 68,417
Leases Office Space from R&D Labs Canada, Inc [Member]
Operating Lease, Monthly Rent	$ 3,390	$ 2,608
Operating Lease, Right-of-Use Asset					161,405		161,405
Operating Lease, Liability, Total					162,692		162,692
Lessee, Operating Lease, Discount Rate										8.00%
Leases Office Space from R&D Labs Canada, Inc [Member] \| General and Administrative Expense [Member]
Operating Lease, Expense					5,945	6,044	17,983	18,054
Long-term Convertible Notes Payable to Multiple Private Investors [Member]
Debt Instrument, Interest Rate, Stated Percentage																5.00%
Convertible Debt Issued to Lessor's Creditor [Member]
Convertible Debt, Total																	$ 824,446
CEN Biotech Ukraine [Member]
Business Acquisition, Percentage of Voting Interests Acquired												51.00%
CEN Biotech Ukraine [Member]
Due from Related Parties, Total					1,035,328		1,035,328						875,328
Percentage of Related Party's Equity Interest Owned by Director														25.50%	51.00%
CEN Biotech Ukraine [Member] \| Equipment Sold to Related Party in Exchange for Note Receivable [Member]
Adjustments to Additional Paid in Capital, Dividends in Excess of Retained Earnings									$ 255,141
Notes Receivable, Related Parties									44,859
Board Members and Officers [Member] \| Consulting Fees [Member]
Related Party Transaction, Amounts of Transaction					39,000	$ 35,014	104,000	$ 112,053
Due to Related Parties, Total					$ 228,800		$ 228,800						$ 124,800
R&D Labs Canada, Inc [Member] \| Purchased Equipment in Exchange for Note Payable [Member]
Notes Payable, Related Parties									$ 300,000