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Note 13 - Related Party Transactions (Details Textual)		1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
Note 13 - Related Party Transactions (Details Textual)	Sep. 01, 2013 CAD ($)	Jan. 31, 2017 CAD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2018	Dec. 03, 2017	Dec. 02, 2017	Jul. 12, 2017	Jan. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
General and Administrative Expense [Member]
Operating Leases, Rent Expense, Total			$ 23,000	$ 23,000	$ 46,000	$ 46,000
Lease Arrangement, 20 North Rear Road [Member]
Operating Lease Annual Rent	$ 339,000
Accrued Rent													$ 552,934
Operating Lease, Monthly Rent		$ 4,000
Lessee, Operating Lease, Term of Contract												5 years
Long-term Convertible Notes Payable to Multiple Private Investors [Member]
Debt Instrument, Interest Rate, Stated Percentage											5.00%
Convertible Debt Issued to Lessor's Creditor [Member]
Convertible Debt, Total												$ 824,446
CEN Biotech Ukraine [Member] \| Scenario, Forecast [Member]
Business Acquisition, Percentage of Voting Interests Acquired								51.00%
CEN Biotech Ukraine [Member]
Due from Related Parties, Total			775,328		775,328		$ 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			45,839	$ 0	77,039	$ 83,727
Due to Related Parties, Total			$ 62,400		$ 62,400		11,986
R&D Labs Canada, Inc [Member] \| Purchased Equipment in Exchange for Note Payable [Member]
Notes Payable, Related Parties							$ 300,000