Note 10 - Loans Payable - Related Parties - Loans Payable to Related Parties (Details) - Loans Payable to Related Party [Member] - USD ($)	Dec. 31, 2018	Dec. 31, 2017
Long-term Debt	$ 1,360,806	$ 1,138,923
Less: current portion	1,360,806	838,923
Long-term portion loans payable - related party		300,000
Bill Chaaban, President of Cen Biotech [Member]
Long-term Debt	234,306	237,423
Creative Edge [Member]
Long-term Debt	601,500	601,500
R&D Labs Canada, Inc [Member]
Long-term Debt	300,000	300,000
Spouse of Joseph Byrne, CEO of CEN Biotech [Member]
Long-term Debt	100,000
Director, Alex Tarrabain [Member]
Long-term Debt	75,000
Joseph Byrne [Member]
Long-term Debt	$ 50,000

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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