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Note 17 - Related Party Transactions (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2017	Dec. 14, 2017	Dec. 02, 2017
Notes Receivable, Related Parties, Current	$ 0	$ 17,901
Accounts Payable, Related Parties, Current	$ 101,422	8,347
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
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	$ 1,299,328	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	188,718	124,800
Due to Related Parties, Total	518,918	330,200
Chief Technology Officer [Member] \| Payoll Expenses [Member]
Related Party, General and Administrative Expenses	94,553
R&D Labs Canada, Inc [Member] \| Purchased Equipment in Exchange for Note Payable [Member]
Notes Payable, Related Parties			$ 300,000
Director, Joe Byrne [Member] \| Advances Made to the Company [Member]
Accounts Payable, Related Parties, Current	8,347	$ 8,347
The Chief Financial Officer, Alex Tarrabain [Member]
Accounting Advisory Services, Fees	13,320
The Chief Financial Officer, Alex Tarrabain [Member] \| Reimbursable Expenses [Member]
Accounts Payable, Related Parties, Current	30,795
The Chief Technology Officer, Lawrence Lehoux [Member] \| Reimbursable Expenses [Member]
Accounts Payable, Related Parties, Current	$ 48,960