Note 23 - Fair Value Disclosures - Fair Value of Financial Instruments (Details) - USD ($)	Dec. 31, 2017	Dec. 31, 2016
Reported Value Measurement [Member]
Cash and cash equivalents	$ 84,978	$ 62,381
Other receivables	222,562
Note receivable - related party	44,859
Advances to CEN Biotech Ukraine, LLC - related party	775,328	425,328
Loans payable	9,981,883	9,962,287
Loans payable – related parties	1,138,923	846,448
Convertible notes payable	3,670,172	569,412
Convertible notes payable - related parties	2,710,313	2,210,313
Estimate of Fair Value Measurement [Member]
Cash and cash equivalents	84,978	62,381
Other receivables	222,562
Note receivable - related party	44,859
Advances to CEN Biotech Ukraine, LLC - related party	775,328	425,328
Loans payable	9,981,883	9,962,287
Loans payable – related parties
Convertible notes payable	3,831,760	587,184
Convertible notes payable - related parties
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents
Other receivables
Note receivable - related party
Advances to CEN Biotech Ukraine, LLC - related party
Loans payable
Loans payable – related parties
Convertible notes payable
Convertible notes payable - related parties
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Cash and cash equivalents	84,978	62,381
Other receivables
Note receivable - related party
Advances to CEN Biotech Ukraine, LLC - related party
Loans payable
Loans payable – related parties
Convertible notes payable
Convertible notes payable - related parties
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Cash and cash equivalents
Other receivables	222,562
Note receivable - related party	44,859
Advances to CEN Biotech Ukraine, LLC - related party	775,328	425,328
Loans payable	9,981,883	9,962,287
Loans payable – related parties
Convertible notes payable	3,831,760	587,184
Convertible notes payable - related parties