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Note 6 - Convertible Notes Payable - Affiliates (Details Textual) - USD ($)
12 Months Ended
Jan. 01, 2020
Jun. 30, 2021
Jun. 30, 2020
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)   $ 0.75  
Convertible Notes Payable, Noncurrent   $ 4,793,097 $ 4,595,841
Interest Expense, Total   $ 657,945 466,891
Secured Promissory Note, Consideration for Warrants Expiring on December 31, 2025 [Member]      
Financing Receivable, Interest Rate, Stated Percentage   4.00%  
Chief Executive Officer [Member]      
Deferred Compensation, Transfer to Convertible Notes     $ 436,508
President [Member]      
Number of Shares Per Unit (in shares)     1
Number of Warrants Per Unit (in shares)   1 1
Deferred Compensation, Transfer to Convertible Notes     $ 199,573
Minimum [Member]      
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)   $ 0.60  
Maximum [Member]      
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)   $ 1.50  
The 2020 Convertible Obligations [Member] | Convertible Debt [Member]      
Debt Instrument, Interest Rate, Stated Percentage 4.00%    
Debt Instrument, Interest Rate, Stated Percentage, Quarterly 4.00%    
Number of Shares Per Unit (in shares) 1    
Conversion Price Per Unit (in dollars per share) $ 0.50    
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 1   $ 0.75
Debt Instrument, Convertible, Beneficial Conversion Feature $ 0    
Interest Expense, Total   $ 175,794 $ 137,130
The 2020 Convertible Obligations [Member] | Convertible Debt [Member] | Chief Executive Officer [Member]      
Convertible Notes Payable, Noncurrent   2,502,880 2,408,432
The 2020 Convertible Obligations [Member] | Convertible Debt [Member] | President [Member]      
Convertible Notes Payable, Noncurrent   1,186,926 1,123,736
The 2020 Convertible Obligations [Member] | Convertible Debt [Member] | Executive Vice Chairman [Member]      
Convertible Notes Payable, Noncurrent   $ 481,119 462,963
The 2020 Convertible Obligations [Member] | Convertible Debt [Member] | Minimum [Member]      
Number of Warrants Per Unit (in shares) 0.5    
The 2020 Convertible Obligations [Member] | Convertible Debt [Member] | Maximum [Member]      
Number of Warrants Per Unit (in shares) 1    
September 2015 Convertible Notes [Member] | Convertible Debt [Member]      
Conversion Price Per Unit (in dollars per share)   $ 0.60  
Debt Instrument, Convertible, Beneficial Conversion Feature   $ 0  
Interest Expense, Total   21,462 21,462
September 2015 Convertible Notes [Member] | Convertible Debt [Member] | Chief Executive Officer [Member]      
Convertible Notes Payable, Noncurrent   171,343 165,653
September 2015 Convertible Notes [Member] | Convertible Debt [Member] | President [Member]      
Convertible Notes Payable, Noncurrent   20,190 19,535
September 2015 Convertible Notes [Member] | Convertible Debt [Member] | Executive Vice Chairman [Member]      
Convertible Notes Payable, Noncurrent   $ 430,639 $ 415,522