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Note 3 - Advances to CEN Biotech Ukraine and Acquisition of Clear Com Media (Details Textual) - USD ($)
6 Months Ended 12 Months Ended
Jul. 09, 2021
Jul. 09, 2021
Dec. 31, 2021
Jun. 30, 2022
Sep. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Dec. 02, 2017
Finite-Lived Intangible Assets, Accumulated Amortization       $ 2,379,370   $ 2,280,315    
Clear Com Media, Inc [Member]                
Stock Issued During Period, Shares, Acquisitions (in shares) 4,000,000              
Stock Issued During Period, Value, Acquisitions $ 2,120,000              
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Accounts Receivable     $ 8,000          
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles     (168,000)          
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Liabilities     23,000          
Goodwill, Purchase Accounting Adjustments     184,000          
Finite-lived Intangible Assets Acquired   $ 456,855            
Clear Com Media, Inc [Member] | General and Administrative Expense [Member]                
Business Combination, Acquisition Related Costs $ 80,000              
Clear Com Media, Inc [Member] | Minimum [Member]                
Finite-Lived Intangible Asset, Useful Life (Year) 3 years              
Clear Com Media, Inc [Member] | Maximum [Member]                
Finite-Lived Intangible Asset, Useful Life (Year) 7 years              
Clear Com Media, Inc [Member] | Scenario, Adjustment [Member]                
Finite-Lived Intangible Assets, Accumulated Amortization         $ 15,000      
CEN Biotech Ukraine [Member]                
Due from Related Parties, Total     $ 1,299,328 $ 1,229,328     $ 1,179,328  
Percentage of Related Party's Equity Interest Owned by Director               51.00%
CEN Biotech Ukraine [Member] | Usamakh Saadikh [Member]                
Percentage of Related Party's Equity Interest Owned by Director       25.50%        
Ownership Percentage       49.00%