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Note 15 - Stockholders' Deficit - Option Activity (Details)
 3 Months Ended
Jun. 30, 2025
$ / shares
shares
Outstanding, options (in shares) 2,197,917
The 2016 Equity Incentive Plan [Member] | Share-Based Payment Arrangement, Employee [Member]  
Outstanding, options (in shares) 2,201,667
Outstanding, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 3.72
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) (3,750)
Forfeited or expired, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 5.06
Outstanding, options (in shares) 2,197,917
Outstanding, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 3.72
Exercisable, options (in shares) 2,195,917
Exercisable, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 3.72