Note 6 - Loans Payable - Related Party - Loans Payable to Related Parties (Details) - Loans Payable to Related Party [Member] - USD ($)	Jun. 30, 2022	Dec. 31, 2021
Long-term Debt	$ 2,701,641	$ 2,701,641
Mr. Chaaban [Member]
Long-term Debt	1,388,122	1,388,122
Creative Edge [Member]
Long-term Debt	601,500	601,500
R&D Labs Canada, Inc [Member]
Long-term Debt	300,000	300,000
Bill Chaaban, President of Cen Biotech [Member]
Long-term Debt	237,019	237,019
Spouse of Joseph Byrne, CEO of CEN Biotech [Member]
Long-term Debt	100,000	100,000
Director, Alex Tarrabain [Member]
Long-term Debt	75,000	75,000
Joseph Byrne [Member]
Long-term Debt	$ 0	$ 0