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Note 11 - Related Party Transactions (Details Textual)			1 Months Ended		3 Months Ended		12 Months Ended
Note 11 - Related Party Transactions (Details Textual)	Aug. 01, 2020 USD ($) shares	Oct. 01, 2017 USD ($)	Sep. 30, 2022 USD ($)	Jan. 31, 2017 CAD ($)	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2020 USD ($)	Dec. 14, 2017	Dec. 02, 2017	Jul. 12, 2017
Notes Receivable, Related Parties, Current					$ 17,901			$ 17,901
Operating Lease, Liability, Total					$ 170,169
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
Lessee, Operating Lease, Discount Rate	8.00%
Operating Lease, Right-of-Use Asset	$ 48,110
Operating Lease, Liability, Total	45,118
Gain (Loss) on Termination of Lease	(53,692)
Operating Lease, Expense						$ 8,719
Leases Office Space from R&D Labs Canada, Inc [Member]
Operating Lease, Monthly Rent		$ 2,608
Lessee, Operating Lease, Discount Rate					8.00%
Operating Lease, Liability, Total					$ 170,169			164,997
Operating Lease, Expense					5,172	6,325
Operating Lease, Impairment Loss	$ 146,795
Leases Office Space from R&D Labs Canada, Inc [Member] \| Forecast [Member]
Operating Lease, Monthly Rent			$ 3,390
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%
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%
Emergence Global [Member]
Notes Receivable, Related Parties, Current					$ 17,901			17,901
Joseph Byrne [Member]
Percentage of Related Party's Equity Interest Owned					5.00%
CEN Biotech Ukraine [Member]
Notes Receivable, Related Parties, Current					$ 17,901
Due from Related Parties, Total					1,229,328			1,179,328
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
Board Members and Officers [Member] \| Consulting Fees [Member]
Related Party Transaction, Amounts of Transaction					31,200	$ 31,200
Due to Related Parties, Total					$ 361,400			$ 330,200
R&D Labs Canada, Inc [Member] \| Purchased Equipment in Exchange for Note Payable [Member]
Notes Payable, Related Parties							$ 300,000