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Note 10 - Stockholders' Equity - Summary of Stock Option Activity (Details)
 9 Months Ended
Dec. 31, 2024
$ / shares
shares
Outstanding, option (in shares) | shares 140,000
Outstanding, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 1.87
Granted, units (in shares) | shares 0
Granted, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 0
Exercised, option (in shares) | shares 0
Exercised, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 0
Forfeited or expired, units (in shares) | shares (15,000)
Forfeited or expired, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 4.2
Outstanding, option (in shares) | shares 125,000
Outstanding, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 1.59
Exercisable, option (in shares) | shares 115,000
Exercisable, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 1.31