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Note 11 - Changes in Stockholders' Equity (Details Textual) - USD ($)
 9 Months Ended 12 Months Ended
Aug. 30, 2023
Jun. 01, 2023
Jul. 07, 2021
Feb. 05, 2021
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Preferred Stock, Shares Authorized (in shares)         20,000,000   20,000,000 20,000,000
Preferred Stock, Par or Stated Value Per Share (in dollars per share)         $ 0.001   $ 0.001 $ 0.001
Preferred Stock, Shares Issued (in shares)         0   0 0
Common Stock, Shares Authorized (in shares)         500,000,000   500,000,000 500,000,000
Common Stock, Par or Stated Value Per Share (in dollars per share)         $ 0.001   $ 0.001 $ 0.001
Common Stock, Shares, Issued (in shares)         5,603,083   4,847,384 4,809,070
Proceeds from Issuance of Common Stock         $ 3,675,000 $ 0 $ 0 $ 5,562,511
Private Placement [Member]                
Proceeds from Issuance of Common Stock $ 3,675,000              
Stock Issued During Period, Shares, New Issues (in shares) 735,000   714,701 631,250        
Shares Issued, Price Per Share (in dollars per share) $ 5              
Five Nonemployee Directors [Member]                
Stock Issued During Period, Shares, Issued for Services (in shares)   20,699            
Stock Issued During Period, Value, Issued for Services   $ 125,229