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Note 12 - Related Party Transactions (Details Textual)			1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended	13 Months Ended
Note 12 - Related Party Transactions (Details Textual)	Aug. 01, 2020 USD ($) shares	Oct. 01, 2017 CAD ($)	Sep. 30, 2022 CAD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2017 USD ($)	Jan. 31, 2018 CAD ($)	Mar. 31, 2020 a	Dec. 31, 2019 USD ($)	Dec. 14, 2017	Dec. 02, 2017	Jul. 12, 2017
Area of Land (Acre) \| a										10.4
Stock Issued During Period, Value, Issued for Settlement of Lease Termination						$ 50,700
Operating Lease, Right-of-Use Asset											$ 229,284
Operating Lease, Liability, Total				154,504		154,504
Gain (Loss) on Termination of Lease				(53,692)		(53,692)
Operating Lease, Impairment Loss						(146,795)
Lease Arrangement, 20 North Rear Road [Member]
Operating Lease, Monthly Rent									$ 4,000
Lessee, Operating Lease, Term of Contract (Year)									5 years
Stock Issued During Period, Shares, Issued for Settlement of Lease Termination (in shares) \| shares	36,500
Stock Issued During Period, Value, Issued for Settlement of Lease Termination	$ 50,700
Operating Lease, Right-of-Use Asset	48,110										68,547
Operating Lease, Liability, Total	45,118										$ 65,467
Gain (Loss) on Termination of Lease	(53,692)
Lessee, Operating Lease, Discount Rate											8.00%
Operating Lease, Expense				2,982	9,098	20,391	24,190
Leases Office Space from R&D Labs Canada, Inc [Member]
Operating Lease, Monthly Rent		$ 2,608	$ 3,390
Operating Lease, Right-of-Use Asset											$ 160,737
Operating Lease, Liability, Total				$ 154,504		$ 154,504					$ 163,157
Lessee, Operating Lease, Discount Rate				8.00%		8.00%					8.00%
Operating Lease, Expense				$ 5,248	5,945	$ 18,501	17,983
Operating Lease, Impairment Loss	$ 146,795
Former CEO [Member]
Ownership Percentage				5.00%		5.00%
Long-term Convertible Notes Payable to Multiple Private Investors [Member]
Debt Instrument, Interest Rate, Stated Percentage														5.00%
CEN Biotech Ukraine [Member] \| XN Pharma [Member]
Ownership Percentage				49.00%		49.00%						49.00%
CEN Biotech Ukraine [Member]
Percentage of Related Party's Equity Interest Owned by Director												25.50%
Business Acquisition, Percentage of Voting Interests Acquired												51.00%
CEN Biotech Ukraine [Member]
Due from Related Parties, Total				$ 1,170,328		$ 1,170,328					$ 1,065,328
Percentage of Related Party's Equity Interest Owned by Director													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
Joseph Byrne [Member]
Related Party Transaction, Due from (to) Related Party, Current, Total				(8,347)		(8,347)
Board Members and Officers [Member] \| Consulting Fees [Member]
Related Party Transaction, Amounts of Transaction				$ 31,200	39,000	$ 93,600	104,000
Due to Related Parties, Total					$ 299,000		$ 299,000				$ 263,900
R&D Labs Canada, Inc [Member] \| Purchased Equipment in Exchange for Note Payable [Member]
Notes Payable, Related Parties								$ 300,000