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Note 5 - Stockholders' Equity (Details Textual) - USD ($)
 1 Months Ended 2 Months Ended 9 Months Ended 12 Months Ended
May 27, 2022
Jan. 19, 2022
Feb. 11, 2021
Sep. 30, 2023
Aug. 31, 2023
Mar. 31, 2023
Aug. 31, 2022
Jul. 31, 2022
Sep. 30, 2023
Dec. 31, 2022
Dec. 31, 2021
Nov. 09, 2022
Jun. 01, 2021
Sep. 29, 2020
Stock Issued During Period, Shares, New Issues     1,644,000                      
Proceeds from Issuance of Common Stock     $ 9,400,000                      
Proceeds from Warrant Exercises                 $ 0 $ 7,626,134 $ 3,404,156      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights                   10,567,484        
Class of Warrant or Right, Exercise Price of Warrants or Rights                   $ 0.414        
Stock Issued During Period, Shares, Issued for Services       73,385 178,253 108,696       143,500 13,707      
Common Stock, Capital Shares Reserved for Future Issuance                   15,459,615        
Share-Based Compensation Arrangement by Share-Based Payment Award, Purchase Price of Common Stock, Percent                   110.00%        
Share-Based Compensation Arrangement by Share-Based Payment Award, Expiration Period                   10 years        
Stock Incentive Plan 2020 [Member]                            
Common Stock, Capital Shares Reserved for Future Issuance       5,018,800         5,018,800 2,250,000        
Private Placement [Member]                            
Stock Issued During Period, Shares, New Issues 1,050,000 707,484                        
Proceeds from Issuance or Sale of Equity $ 18,500,000 $ 9,200,000                        
Unit Warrant [Member]                            
Class of Warrant or Right, Exercised During Period                     740,034      
Proceeds from Warrant Exercises, Gross                     $ 3,400,000      
Proceeds from Warrant Exercises                     $ 3,400,000      
Class of Warrant or Right, Exercise Price of Warrants or Rights                   $ 1.65       $ 5
Stock Purchase Warrants [Member]                            
Class of Warrant or Right, Exercised During Period                     149,705      
Stock Issued During Period, Shares, Warrants Exercised                     215,672      
Pre-Funded Warrants [Member]                            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 11,071,214 2,360,000                        
Class of Warrant or Right, Exercised               9,090,910            
Common Warrant [Member]                            
Class of Warrant or Right, Number of Securities Called by Warrants or Rights   3,067,484                        
Class of Warrant or Right, Exercise Price of Warrants or Rights   $ 3.26                   $ 3.26    
Preferred Investment Options [Member]                            
Proceeds from Warrant Exercises             $ 7,626,000              
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 12,121,214                          
Class of Warrant or Right, Exercise Price of Warrants or Rights $ 1.65                          
Class of Warrant or Right, Exercised             4,621,214              
Series B Convertible Preferred Stock [Member]                            
Preferred Stock, Shares Outstanding                   0     100  
Preferred Stock, Par or Stated Value Per Share                         $ 1,000