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Schedule of Stock Option Activity (Details)
 12 Months Ended
Apr. 30, 2022
$ / shares
shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]  
Shares underlying options outstanding, beginning | shares 516,827
Weighted average exercise price, beginning balance $ 3.89
Weighted Average Remaining Contractual Term (In Years), Beginning 9 years
Shares underlying options outstanding, granted | shares 793,850
Weighted Average Exercise Price, Granted $ 1.43
Shares Underlying Options Outstanding, Exercised | shares (45,332)
Weighted Average Exercise Price, Exercised $ 1.05
Shares Underlying Options Outstanding, Cancelled/forfeited | shares (153,183)
Weighted Average Exercise Price, Cancelled/forfeited $ 2.86
Shares underlying options outstanding, expired | shares (1,806)
Weighted average exercise price, expired $ 32.62
Shares underlying options outstanding, ending | shares 1,110,356
Weighted average exercise price, ending balance $ 2.34
Weighted Average Remaining Contractual Term (In Years), Ending 9 years 2 months 12 days
Shares Underlying Options Outstanding, Exercisable at Ending | shares 297,504
Weighted average exercise price, exercisable at ending $ 4.65
Weighted average remaining contractual term (in years), exercisable at ending 7 years 9 months 18 days
Weighted Average Exercise Price, Exercisable $ 4.65
Performance Stock Options [Member]  
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]  
Shares underlying options outstanding, beginning | shares 424,790
Weighted average exercise price, beginning balance $ 2.57
Weighted Average Remaining Contractual Term (In Years), Beginning 9 years 6 months
Shares underlying options outstanding, granted | shares 66,667
Weighted Average Exercise Price, Granted $ 0.62
Shares Underlying Options Outstanding, Exercised | shares (40,668)
Weighted Average Exercise Price, Exercised $ 1
Shares Underlying Options Outstanding, Cancelled/forfeited | shares (240,667)
Weighted Average Exercise Price, Cancelled/forfeited $ 2.61
Shares underlying options outstanding, ending | shares 210,122
Weighted average exercise price, ending balance $ 2.20
Weighted Average Remaining Contractual Term (In Years), Ending 8 years 9 months 18 days
Shares Underlying Options Outstanding, Exercisable at Ending | shares
Weighted average exercise price, exercisable at ending
Weighted Average Exercise Price, Exercisable