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Note 5 - Stockholders' Equity - 10Q (Details Textual) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 12 Months Ended
Mar. 25, 2025
Mar. 31, 2025
Dec. 31, 2024
Jun. 30, 2025
Common Stock, Capital Shares Reserved for Future Issuance     8,651,395  
Stock Incentive Plan 2020 [Member]        
Common Stock, Capital Shares Reserved for Future Issuance     2,033,648 2,033,648
March 2025 Pre-funded Warrants [Member]        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) 2,085,115      
March 2025 Common Warrants [Member]        
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) $ 1.31      
March 2025 Common Warrants [Member] | Maximum [Member]        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares) 3,435,115      
Registered Direct Offering [Member]        
Stock Issued During Period, Shares, New Issues (in shares) 1,350,000      
March 2025 Offering [Member[        
Proceeds from Issuance or Sale of Equity $ 4.1      
At-the-Market Program [Member]        
Stock Issued During Period, Shares, New Issues (in shares)   1,952,603 2,012,167  
Proceeds from Issuance of Common Stock   $ 3.8 $ 4.9