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Stockholders' Equity (Tables)
 12 Months Ended
Apr. 30, 2022
Stockholders' Equity Note [Abstract]  
Schedule of Restricted Stock Unit Activity
A summary of the Company’s RSU activity which were granted under the 2021 and 2018 Equity Incentive Plans during the year ended April 30, 2022 is presented below:
Restricted Stock UnitsNumber of SharesWeighted Average Grant Date Fair Value
Unvested balance outstanding, April 30, 2021549,972 $6.58 
Granted520,142 5.58 
Forfeits(54,610)8.49 
Vested(85,576)4.27 
Expired— — 
Unvested balance outstanding, April 30, 2022929,928 $6.12 
Summary of Warrant Activity A summary of the Company’s warrant activity during the year ended April 30, 2022 is presented below:
WarrantsNumber of SharesWeighted
Average
Exercise
Price		Weighted
Average
Remaining
Contractual
Term		Aggregate
Intrinsic
Value
Balance Outstanding, April 30, 2021374,174 $6.37 1.9— 
Granted275,000 2.43 4.80— 
Exercised— — — — 
Surrendered— — — — 
Expired— — — — 
Balance Outstanding, April 30, 2022649,174 $4.70 1.96$— 
Exercisable, April 30, 2022624,174 $4.61 2.48$— 
Share-based Payment Arrangement, Option, Exercise Price Range
OUTSTANDING WARRANTSEXERCISABLE WARRANTS
Exercise
Price		Weighted
Average
Exercise
Price		Outstanding
Number of
Warrants		Weighted
Average
Exercise
Price		Weighted
Average
Remaining Life
In Years		Exercisable
Number of
Warrants
$1.00$1.00 200,000 $1.004.99200,000 
$4.89$4.89 50,000 $4.891.9550,000 
$5.85$5.85 50,000 $5.854.3450,000 
$6.00$6.00 100,000 $6.001.85100,000 
$6.87$6.87 224,174 $6.870.24224,174 
$6.99$6.99 25,000 $0.00— — 
649,174 624,174 
OUTSTANDING OPTIONSEXERCISABLE OPTIONS
Exercise
Price		Weighted
Average
Exercise
Price		Outstanding
Number of
Options		Weighted
Average
Exercise
Price		Weighted
Average
Remaining Life
In Years		Exercisable
Number of
Options
$3.24 to $4.38
$3.82 63,165 $4.50 1.4451,998 
$4.50 to $5.20
$4.94 138,176 $4.98 1.74137,543 
$5.95 to $6.28
$5.95 28,000 $5.95 0.3128,000 
$7.17 to $7.55
$7.45 473,092 $7.46 1.32465,095 
$8.57 to $9.07
$8.98 157,749 $8.98 0.69157,749 
860,182 840,385 
Summary of Stock Option Activity A summary of the Company’s stock option activity for employees and directors during the year ended April 30, 2022, is presented below:
OptionsNumber of
Shares		Weighted
Average
Exercise
Price		Weighted
Average
Remaining
Contractual
Term		Aggregate
Intrinsic
Value
Balance Outstanding, April 30, 20211,214,473 $6.24 1.88$204,719 
Granted— — — — 
Exercised(258,419)5.60 — — 
Forfeited(7,297)2.89 — — 
Expired(88,575)0.83 — — 
Balance Outstanding, April 30, 2022860,182 $7.03 1.25$— 
Exercisable, April 30, 2022840,385 $7.08 1.24$— 
Schedule of Share-Based Compensation
A summary of the Company’s stock-based compensation expense, which is included in "general and administrative" expense in the consolidated statement of operations is presented below:

Years Ended April 30,
20222021
RSUs$2,095,533 $3,335,250 
Restricted Stock307,283 62,007 
Stock options131,849 560,828 
   Total stock-based compensation expense$2,534,665 $3,958,085