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Note 4 - Equity - Schedule of Stock Option Activity (Details) - USD ($)
 3 Months Ended 12 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Mar. 31, 2024
Apr. 01, 2024
Outstanding, options (in shares) 243,483 100,180    
Outstanding, options, weighted average exercise price (in dollars per share) $ 32.72 $ 46.59    
Outstanding, options, Weighted average remaining contractual term (Year)   8 years 11 months 1 day 9 years 4 months 6 days  
Outstanding, aggregate intrinsic value   $ 0   $ 1,680,672
Granted, options (in shares) 5,000 143,303    
Granted, options, weighted average exercise price (in dollars per share) $ 1.85 $ 23.02    
Exercised, options (in shares) 0 0    
Exercised, options, weighted average exercise price (in dollars per share) $ 0 $ 0    
Forfeited/Cancelled, options (in shares) 0 0    
Forfeited/Cancelled, options, weighted average exercise price (in dollars per share) $ 0 $ 0    
Expired, options (in shares) 0 0    
Expired, options, weighted average exercise price (in dollars per share) $ 0 $ 0    
Outstanding, options (in shares) 248,483 243,483 100,180  
Outstanding, options, weighted average exercise price (in dollars per share) $ 32.1 $ 32.72 $ 46.59  
Exercisable, options (in shares) [1] 69,916 37,923    
Exercisable, options, weighted average exercise price (in dollars per share) [1] $ 37.24 $ 44.35    
Exercisable, options, Weighted average remaining contractual term (Year)   8 years 2 months 12 days    
Exercisable, aggregate intrinsic value   $ 0    
[1] Aggregate Intrinsic Value = Excess of market value over the exercise price of all in-the-money stock.