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Note 15 - Related Party Transactions (Details Textual) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 03, 2017
Dec. 02, 2017
Jul. 12, 2017
Adjustments to Additional Paid in Capital, Dividends in Excess of Retained Earnings   $ 255,141      
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 $ 875,328 775,328      
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 150,778 767,249      
Due to Related Parties, Total $ 0 11,986      
R&D Labs Canada, Inc [Member] | Purchased Equipment in Exchange for Note Payable [Member]          
Notes Payable, Related Parties   $ 300,000