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Note 2 - Convertible Notes Payable - Schedule of Detachable Warrants - 10Q (Details) - $ / shares
 3 Months Ended 12 Months Ended
Jun. 30, 2025
Mar. 31, 2025
Balance, outstanding (in shares) 25,003 25,003
Outstanding, weighted average exercise price (in dollars per share) $ 20 $ 20
Granted, outstanding (in shares) 0 0
Granted, weighted average exercise price (in dollars per share) $ 0 $ 0
Exercised, outstanding (in shares) 0 0
Exercised, weighted average exercise price (in dollars per share) $ 0 $ 0
Forfeited/Cancelled, outstanding (in shares) 0 0
Forfeited/Cancelled, weighted average exercise price (in dollars per share) $ 0 $ 0
Expired, outstanding (in shares) 0 0
Expired, weighted average exercise price (in dollars per share) $ 0 $ 0
Balance, outstanding (in shares) 25,003 25,003
Outstanding, weighted average exercise price (in dollars per share) $ 20 $ 20
Exercisable (in shares) 25,003 25,003
Exercisable, weighted average exercise price (in dollars per share) $ 20 $ 20