Note 17 - Fair Value Disclosures - Fair Value of Financial Instruments (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Reported Value Measurement [Member]
Cash and cash equivalents	$ 427,013	$ 84,978
Other receivables	368,580	222,562
Note receivable - related party	44,859	44,859
Advances to CEN Biotech Ukraine, LLC – related party	775,328	775,328
Loans payable	10,023,606	9,981,883
Loans payable – related parties	1,362,877	1,138,923
Convertible notes payable	4,242,221	3,670,172
Convertible notes payable – related parties	2,710,313	2,710,313
Estimate of Fair Value Measurement [Member]
Cash and cash equivalents	427,013	84,978
Other receivables	368,580	222,562
Note receivable - related party	44,859	44,859
Advances to CEN Biotech Ukraine, LLC – related party	775,328	775,328
Loans payable	10,023,606	9,981,883
Loans payable – related parties
Convertible notes payable	4,456,326	3,831,760
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	427,013	84,978
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	368,580	222,562
Note receivable - related party	44,859	44,859
Advances to CEN Biotech Ukraine, LLC – related party	775,328	775,328
Loans payable	10,023,606	9,981,883
Loans payable – related parties
Convertible notes payable	4,456,326	3,831,760
Convertible notes payable – related parties