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Note 16 - Stockholders' Deficit - Option Activity (Details)
 6 Months Ended
Sep. 30, 2025
$ / shares
shares
Outstanding, options (in shares) 209,916
The 2016 Equity Incentive Plan [Member] | Share-Based Payment Arrangement, Employee [Member]  
Outstanding, options (in shares) 220,167
Outstanding, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 37.2
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) (10,001)
Forfeited or expired, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 50.6
Outstanding, options (in shares) 210,166
Outstanding, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 37.36
Exercisable, options (in shares) 209,916
Exercisable, Weighted Average Exercise Price (in dollars per share) | $ / shares $ 37.34