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Note 8 - Equity Transactions (Details Textual)
1 Months Ended 3 Months Ended 4 Months Ended 9 Months Ended 12 Months Ended
Aug. 27, 2020
USD ($)
$ / shares
shares
Apr. 24, 2020
USD ($)
$ / shares
May 31, 2019
USD ($)
$ / shares
shares
May 23, 2018
shares
Jan. 30, 2019
USD ($)
Apr. 30, 2018
USD ($)
$ / shares
shares
Apr. 30, 2014
Sep. 30, 2020
USD ($)
$ / shares
shares
Sep. 30, 2019
USD ($)
Mar. 30, 2018
USD ($)
Apr. 30, 2018
$ / shares
shares
Sep. 30, 2020
USD ($)
$ / shares
shares
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
shares
May 22, 2018
shares
Oct. 31, 2017
shares
Share-based Payment Arrangement, Expense | $               $ 5,320 $ 97,250     $ 19,380 $ 159,380 $ 168,120 $ 83,420      
Shares Issued, Shares, Share-based Payment Arrangement, before Forfeiture (in shares)                             0      
Proceeds from Issuance of Private Placement | $ $ 2,831,114                 $ 74,983                
Common Stock, Shares Authorized (in shares)       500,000,000       500,000,000       500,000,000   500,000,000 500,000,000   100,000,000  
Conversion of Preferred Stock to Common Stock, Number of Shares Issued Per Share Converted (in shares)       400                            
Increase (Decrease) in Number of Common Shares Outstanding (in shares)       14,240,000                            
Equity Units, Number of Common Shares in Each Unit (in shares)                             1      
Proceeds from Issuance or Sale of Equity, Net of Issuance Costs | $                           $ 7,120,000        
Series B Preferred Stock [Member]                                    
Convertible Preferred Stock, Shares Issued upon Conversion (in shares)                                   400
Scarsdale Agreement Warrants [Member]                                    
Term of Warrant (Year)                     7 years              
Class of Warrant or Right, Percentage of Securities Issued Called by Warrants or Rights             6.00%                      
Class of Warrant or Right, Exercise Price, Percentage of Offering Price             100.00%                      
Warrants Issued with Units [Member]                                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)           400         400              
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares     $ 0.30     $ 0.25         $ 0.25              
Warrants To Purchase Common Stock [Member]                                    
Term of Warrant (Year)                             7 years      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)               91,854,716       91,854,716            
Warrants Issued to Placement Agent in Connection with Private Placement [Member]                                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)     1,359,000                              
Warrants to Purchase Units Sold in May 2016 Private Placement [Member]                                    
Term of Warrant (Year)                           7 years        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)               480,000       480,000   480,000        
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares               $ 0.25       $ 0.25   $ 0.25        
Warrants to Purchase Units Sold in February 2017 Private Placement [Member]                                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)               164,074       164,074   164,074        
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares               $ 0.35       $ 0.35   $ 0.35        
Warrants to Purchase Units Sold in October 2017 Private Placement [Member]                                    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)               600       600   600        
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares               $ 100       $ 100   $ 100        
Financial Advisory and Exclusive Placement Agent Agreement [Member] | Scarsdale [Member]                                    
Private Placement Fee, Percentage of Proceeds             6.00%                      
Private Placement [Member]                                    
Equity Units, Number of Series B Convertible Preferred Stock in Each Unit (in shares)           1         1              
Term of Warrant (Year)                     7 years              
Equity Units Issued During Period, Shares, New Issues (in shares) 28,311,140   29,770,000     20,100                 3,519,963      
Share Price (in dollars per share) | $ / shares           $ 100         $ 100       $ 0.65      
Proceeds from Issuance of Private Placement | $   $ 2,000,000 $ 7,442,500   $ 130,063 $ 2,010,000                 $ 2,342,034      
Payment for Cash Fee | $                             $ 50,000      
Equity Units, Number of Common Shares in Each Unit (in shares) 1   1                              
Shares Issued, Price Per Share (in dollars per share) | $ / shares $ 0.10 $ 0.10 $ 0.25                              
Equity Units, Number of Warrants in Each Unit     1                              
Payments of Stock Issuance Costs | $     $ 452,900                              
Proceeds from Issuance or Sale of Equity, Net of Issuance Costs | $     $ 6,989,600                              
Private Placement [Member] | Series B Preferred Stock [Member]                                    
Convertible Preferred Stock, Shares Issued upon Conversion (in shares)           400         400              
Employees [Member]                                    
Shares Issued, Shares, Share-based Payment Arrangement, before Forfeiture (in shares)                           450,000        
Shares Issued, Value, Share-based Payment Arrangement, before Forfeiture | $                           $ 87,750        
Director [Member]                                    
Shares Issued, Shares, Share-based Payment Arrangement, before Forfeiture (in shares)                           241,666        
Shares Issued, Value, Share-based Payment Arrangement, before Forfeiture | $                           $ 109,908        
Board Members and Officers [Member]                                    
Shares Issued, Shares, Share-based Payment Arrangement, before Forfeiture (in shares)                           344,000        
Shares Issued, Value, Share-based Payment Arrangement, before Forfeiture | $                           $ 158,670        
Share Based Payment Arrangement By Share Based Compensation Arrangement, Deferred Compensation, Shares Acrrued (in shares)                             172,000 172,000