Quarterly report pursuant to Section 13 or 15(d)

Note 10 - Sales of Shares Under Common Stock Purchase Agreement (Details Textual)

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Note 10 - Sales of Shares Under Common Stock Purchase Agreement (Details Textual) - USD ($)
 3 Months Ended 9 Months Ended
Aug. 02, 2023
Nov. 10, 2022
Aug. 11, 2022
Sep. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Jul. 08, 2022
Common Stock, Par or Stated Value Per Share (in dollars per share)       $ 0.001     $ 0.001   $ 0.001  
Stock Issued During Period, Value, New Issues       $ 290,842 $ 56,266 $ 1,999,500        
Registration Rights Agreement [Member]                    
Common Stock, Maximum Shares Sold (in shares)                   450,000
Common Stock Purchase Agreement [Member]                    
Stock Issued During Period, Shares, New Issues (in shares) 20,000                  
B. Riley Principal Capital II, LLC (the “Selling Stockholder”) [Member]                    
Common Stock, Par or Stated Value Per Share (in dollars per share)                   $ 0.001
Amortization of Commitment Fee       $ 54,692     $ 150,000      
B. Riley Principal Capital II, LLC (the “Selling Stockholder”) [Member] | Prepaid Expenses and Other Current Assets [Member]                    
Commitment Fee, Fair Value Disclosure                 $ 150,000  
B. Riley Principal Capital II, LLC (the “Selling Stockholder”) [Member] | Commitment Fee [Member]                    
Stock Issued During Period, Shares, New Issues (in shares)   2,995 8,984              
B. Riley Principal Capital II, LLC (the “Selling Stockholder”) [Member] | Common Stock Purchase Agreement [Member]                    
Stock Issued During Period, Shares, New Issues (in shares)       20,000   0 27,429      
Shares Issued, Average Price Per Share (in dollars per share)       $ 5.9     $ 6.3      
Shares Issued, Fees Per Share (in dollars per share)       $ 0.3     $ 0.3      
Stock Issued During Period, Value, New Issues       $ 118,655     $ 172,108 $ 0