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Note 3 - Equity - Schedule of Stock Option Activity - 10Q (Details) - $ / shares
 3 Months Ended 12 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Outstanding, options (in shares) 243,483 100,180
Outstanding, options, weighted average exercise price (in dollars per share) $ 32.72 $ 46.59
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
Outstanding, options, weighted average exercise price (in dollars per share) $ 32.1 $ 32.72
Exercisable, options (in shares) [1] 69,916 37,923
Exercisable, options, weighted average exercise price (in dollars per share) [1] $ 37.24 $ 44.35
[1] Aggregate Intrinsic Value = Excess of market value over the exercise price of all in-the-money stock.