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Note 15 - Stockholders' Equity - Option Activity (Details)
 9 Months Ended
Dec. 31, 2024
$ / shares
shares
Outstanding, options (in shares) 2,251,667
The 2016 Equity Incentive Plan [Member] | Share-Based Payment Arrangement, Employee [Member]  
Outstanding, options (in shares) 2,266,667
Outstanding, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 3.73
Granted, options (in shares) 0
Granted, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 0
Exercised, options (in shares) 0
Exercised, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 0
Forfeited or expired, options (in shares) (40,000)
Forfeited or expired, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 3.81
Outstanding, options (in shares) 2,226,667
Outstanding, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 3.73
Exercisable, options (in shares) 2,207,917
Exercisable, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 3.72