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Note 10 - Subsequent Events - 10Q (Details Textual) - USD ($)
 1 Months Ended 6 Months Ended 12 Months Ended
Jul. 02, 2025
Jul. 28, 2025
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Proceeds from Warrant Exercises     $ 209 $ 1,389,363 $ 2,367,133 $ 4,062,442
Subsequent Event [Member]            
Units Issued During Period, Units, New Issues (in shares) 9,235,000          
Stock Issued During Period, Shares, New Issues (in shares) 9,235,000          
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) 18,470,000          
Shares Issued, Price Per Share (in dollars per share) $ 0.65          
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 0.65          
Warrants and Rights Outstanding, Term (Year) 5 years          
Proceeds from Issuance or Sale of Equity $ 5,600,000          
Proceeds from Warrant Exercises   $ 130,000        
Subsequent Event [Member] | Pre-Funded Warrants [Member]            
Stock Issued During Period, Shares, Warrants Exercised (in shares)   200,000