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Note 7 - Convertible Notes Payable - Affiliates (Details Textual) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2019
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Convertible Notes Payable, Noncurrent $ 4,523,210   $ 4,523,210   $ 3,801,168      
Interest Expense, Total $ 142,738 $ 97,304 260,340 $ 189,800        
Conversion of Deferred Compensation into Note Payable Affiliate     $ 636,081        
Secured Promissory Note, Consideration for Warrants Expiring on December 31, 2025 [Member]                
Financing Receivable, Interest Rate, Stated Percentage 4.00%   4.00%         4.00%
Warrants Payable With Secured Promissory Notes [Member]                
Class of Warrant or Right, Exercise Price of Warrants or Rights         $ 0.60      
Class of Warrant or Right, Purchase Price of Warrants or Rights, Per Share         $ 0.10      
Chief Executive Officer [Member]                
Deferred Compensation, Transfer to Convertible Notes     $ 436,508          
Chief Executive Officer [Member] | Secured Promissory Note, Consideration for Warrants Expiring on December 31, 2025 [Member]                
Interest Receivable $ 16,964   $ 16,964          
Chief Executive Officer [Member] | Warrants Payable With Secured Promissory Notes [Member]                
Class of Warrant or Right, Number Agreed to Sell         3,000,000      
President [Member]                
Number of Shares Per Unit 1   1          
Number of Warrants Per Unit 1   1          
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 0.75   $ 0.75          
Deferred Compensation, Transfer to Convertible Notes     $ 199,573          
President [Member] | Secured Promissory Note, Consideration for Warrants Expiring on December 31, 2025 [Member]                
Interest Receivable $ 1,696   $ 1,696          
President [Member] | Warrants Payable With Secured Promissory Notes [Member]                
Class of Warrant or Right, Number Agreed to Sell         300,000      
January 2015 Convertible Notes [Member] | Chief Executive Officer [Member] | Warrants Payable With Secured Promissory Notes [Member]                
Secured Promissory Notes Payable with Warrants         $ 300,000      
January 2015 Convertible Notes [Member] | President [Member] | Warrants Payable With Secured Promissory Notes [Member]                
Secured Promissory Notes Payable with Warrants         $ 30,000      
January 2015 Convertible Notes [Member] | Convertible Debt [Member]                
Debt Instrument, Interest Rate, Stated Percentage           4.00%    
Number of Shares Per Unit 1   1          
Number of Warrants Per Unit 0.5   0.5          
Conversion Price Per Unit $ 0.50   $ 0.50          
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 1   $ 1          
Debt Instrument, Convertible, Beneficial Conversion Feature     $ 0          
Interest Expense, Total $ 31,354 26,247 71,870 52,495        
January 2015 Convertible Notes [Member] | Convertible Debt [Member] | Chief Executive Officer [Member]                
Convertible Notes Payable, Noncurrent 2,207,458 1,698,873 2,207,458 1,698,873        
January 2015 Convertible Notes [Member] | Convertible Debt [Member] | President [Member]                
Convertible Notes Payable, Noncurrent 1,118,138 882,202 1,118,138 882,202        
January 2015 Convertible Notes [Member] | Convertible Debt [Member] | Executive Vice Chairman [Member]                
Convertible Notes Payable, Noncurrent 453,886 438,816 453,886 438,816        
September 2015 Convertible Notes [Member] | Convertible Debt [Member]                
Conversion Price Per Unit         $ 0.60      
Debt Instrument, Convertible, Beneficial Conversion Feature         $ 0      
Interest Expense, Total 5,365 5,410 10,731 10,420        
Replacement Note Held as Collateral [Member] | Chief Executive Officer [Member]                
Convertible Notes Payable, Total 162,808 157,141 162,808 157,141     $ 130,000  
Convertible Debt, Amount Sold to a Shareholder By an Officer         $ 300,000      
Replacement Note Held as Collateral [Member] | President [Member]                
Convertible Notes Payable, Total 19,206 18,554 19,206 18,554        
Replacement Note Held as Collateral [Member] | Shareholder [Member]                
Convertible Notes Payable, Total 407,964 392,544 407,964 392,544        
2019 Convertible Notes [Member] | Convertible Debt [Member] | Chief Executive Officer [Member]                
Debt Instrument, Interest Rate, Stated Percentage         4.00%      
Number of Shares Per Unit         1      
Number of Warrants Per Unit         0.5      
Conversion Price Per Unit         $ 0.50      
Class of Warrant or Right, Exercise Price of Warrants or Rights         $ 0.75      
Debt Instrument, Convertible, Beneficial Conversion Feature         $ 0      
Interest Expense, Total 1,482 $ 0 3,359 $ 0        
Convertible Notes Payable, Total $ 153,750   $ 153,750          
Conversion of Deferred Compensation into Note Payable Affiliate         $ 150,000