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Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Jun. 30, 2025
Jun. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Nov. 30, 2019
Net Income (Loss) Attributable to Parent $ (2,940,650) $ (3,036,765) $ (2,703,024) $ (2,690,348) $ (2,662,065) $ (2,469,626)     $ (8,680,439) $ (7,822,039)    
Retained Earnings (Accumulated Deficit) (116,147,702)               (116,147,702)   $ (107,467,263)  
Cash and Cash Equivalent $ 8,394,113               $ 8,394,113   $ 15,842,850  
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount             824,760 1,322,819        
Prefunded Warrants [Member]                        
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 0.001               $ 0.001   $ 0.001 $ 0.001