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Note 5 - Stockholders' Equity (Details Textual) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
May 27, 2022
Jan. 19, 2022
Aug. 31, 2022
Jul. 31, 2022
May 31, 2022
Mar. 31, 2021
Sep. 30, 2022
May 29, 2028
Stock Issued During Period, Value, New Issues           $ 9,408,920    
Stock Incentive Plan 2020 [Member]                
Common Stock, Capital Shares Reserved for Future Issuance (in shares)             1,500,000  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares)             0  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares)             962,300  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price, Ending Balance (in dollars per share)             $ 3.18  
Restricted Stock [Member]                
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares)       75,000 68,500      
Pre-Funded Warrants [Member]                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) 11,071,214 2,360,000            
Class of Warrant or Right, Exercised (in shares) 1,980,304              
Common Warrant [Member]                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)   3,067,484            
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share)   $ 3.26            
Preferred Investment Options [Member]                
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) 12,121,214              
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 1.65              
Proceeds from Issuance or Sale of Equity, Total     $ 7,626,000          
Class of Warrant or Right, Exercised (in shares)     4,621,214          
Preferred Investment Options [Member] | Forecast [Member]                
Class Of Warrant Or Rights, Amount Of Shares To Expire (in shares)               9,090,910
Stock Purchase Warrants [Member]                
Warrants and Rights Outstanding, Term (Year)             8 years 7 months 6 days  
Private Placement [Member]                
Stock Issued During Period, Value, New Issues $ 1,050,000 $ 707,484            
Proceeds from Issuance or Sale of Equity, Total $ 18,500,000 $ 9,200,000