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Note 10 - Stock Based Compensation - Activities Within the Stock Option Plan (Details)
6 Months Ended
Jul. 14, 2023
shares
Sep. 30, 2023
$ / shares
shares
Granted, number of options (in shares) | shares 446,502  
Stock Option Plan [Member]    
Outstanding, weighted average exercise price   $ 13.6
Outstanding, Weighted average grant date fair value beginning period   11.23
Outstanding, Weighted average grant date fair value period end   2.08
Exercised, weighted average fair value   2.27
Forfeited, weighted average fair value   1.61
Granted, weighted average exercise price   $ 2.64
Outstanding, number of options (in shares) | shares   740,957
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 2.27
Granted, number of options (in shares) | shares   446,502
Exercised, weighted average exercise price   $ 1.27
Exercised, number of options (in shares) | shares   (12,500)
Forfeited, weighted average exercise price   $ 13.68
Forfeited, number of options (in shares) | shares   (613,594)
Outstanding, weighted average exercise price   $ 4.14
Outstanding, number of options (in shares) | shares   561,365
Exercisable, weighted average fair value   $ 1.56
Exercisable, weighted average exercise price   $ 6.7
Exercisable, number of options (in shares) | shares   141,455