v3.26.1
Note 10 - Stockholders' Equity - Summary of Stock Option Activity (Details) - $ / shares
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Outstanding, option (in shares) 14,000 14,000
Outstanding, Weighted Average Exercise Price (in dollars per share) $ 15.1 $ 18.7
Number of options granted (in shares) 0 1,500
Granted, Weighted Average Exercise Price (in dollars per share) $ 0 $ 8.1
Exercised, option (in shares) 0 0
Exercised, Weighted Average Exercise Price (in dollars per share) $ 0 $ 0
Forfeited or expired, option (in shares) (1,500) (1,500)
Forfeited or expired, Weighted Average Exercise Price (in dollars per share) $ 50.6 $ 42
Granted, option (in shares) 0 (1,500)
Weighted-average exercise price per share (in dollars per share) $ 0 $ 8.1
Exercised, option (in shares) 0 (0)
Outstanding, option (in shares) 12,500 14,000
Outstanding, Weighted Average Exercise Price (in dollars per share) $ 10.8 $ 15.1
Exercisable, option (in shares) 12,500  
Exercisable, Weighted Average Exercise Price (in dollars per share) $ 10.8