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Note 15 - Related Party Transactions (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 14, 2017
Dec. 03, 2017
Dec. 02, 2017
Jul. 12, 2017
Long-term Convertible Notes Payable to Multiple Private Investors [Member]              
Debt Instrument, Interest Rate, Stated Percentage             5.00%
CEN Biotech Ukraine [Member]              
Business Acquisition, Percentage of Voting Interests Acquired       51.00%      
CEN Biotech Ukraine [Member]              
Due from Related Parties, Total $ 1,065,328 $ 875,328          
Percentage of Related Party's Equity Interest Owned by Director         25.50% 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 154,517 150,778          
Due to Related Parties, Total $ 263,900 $ 124,800          
R&D Labs Canada, Inc [Member] | Purchased Equipment in Exchange for Note Payable [Member]              
Notes Payable, Related Parties     $ 300,000