Note 15 - Fair Value Disclosures - Fair Value of Financial Instruments (Details) - USD ($)	Mar. 31, 2022	Dec. 31, 2020
Reported Value Measurement [Member]
Cash and cash equivalents	$ 135,178	$ 193,198
Note receivable – CEN Biotech Ukraine, LLC – related party	44,859	44,859
Loans payable	1,688,793	1,688,793
Loans payable – related parties	2,701,641	2,701,641
Convertible notes payable	643,330	643,330
Convertible notes payable – related parties	162,639	162,639
Reported Value Measurement [Member] | CEBA, Loan Payable [Member]
Loans payable	47,400	31,552
Reported Value Measurement [Member] | CEN Biotech Ukraine [Member]
Advances to Subsidiary	1,299,328	1,299,328
Estimate of Fair Value Measurement [Member]
Cash and cash equivalents	135,178	193,198
Note receivable – CEN Biotech Ukraine, LLC – related party	44,859	44,859
Loans payable	1,688,793	1,688,793
Loans payable – related parties	0	0
Convertible notes payable	1,890,736	1,890,736
Convertible notes payable – related parties	0	0
Estimate of Fair Value Measurement [Member] | CEBA, Loan Payable [Member]
Loans payable	47,400	31,552
Estimate of Fair Value Measurement [Member] | CEN Biotech Ukraine [Member]
Advances to Subsidiary	1,299,328	1,299,328
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalents	0	0
Note receivable – CEN Biotech Ukraine, LLC – related party	0	0
Loans payable	0	0
Loans payable – related parties	0	0
Convertible notes payable	0	0
Convertible notes payable – related parties	0	0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | CEBA, Loan Payable [Member]
Loans payable	0	0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 1 [Member] | CEN Biotech Ukraine [Member]
Advances to Subsidiary	0	0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Cash and cash equivalents	135,178	193,198
Note receivable – CEN Biotech Ukraine, LLC – related party	0	0
Loans payable	0	0
Loans payable – related parties	0	0
Convertible notes payable	0	0
Convertible notes payable – related parties	0	0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | CEBA, Loan Payable [Member]
Loans payable	0	0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member] | CEN Biotech Ukraine [Member]
Advances to Subsidiary	0	0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Cash and cash equivalents	0	0
Note receivable – CEN Biotech Ukraine, LLC – related party	44,859	44,859
Loans payable	1,688,793	1,688,793
Loans payable – related parties	0	0
Convertible notes payable	1,890,736	1,890,736
Convertible notes payable – related parties	0	0
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | CEBA, Loan Payable [Member]
Loans payable	47,400	31,552
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member] | CEN Biotech Ukraine [Member]
Advances to Subsidiary	$ 1,299,328	$ 1,299,328