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Stockholders' Equity (Tables)
 3 Months Ended
Jul. 31, 2022
Stockholders' Equity Note [Abstract]  
Schedule of Restricted Stock Unit Activity
A summary of the Company’s RSU activity, granted under the 2012 and 2018 Equity Incentive Plans, during the three months ended July 31, 2022 is presented below:
Restricted Stock UnitsNumber of SharesWeighted Average Grant Date Fair Value
Unvested balance outstanding, April 30, 2022929,928 $6.12 
Granted— — 
Forfeits(172,828)7.65 
Vested(14,345)0.97 
Expired— — 
Unvested balance outstanding, July 31, 2022742,755 $5.86 
Summary of Warrant Activity A summary of the Company’s warrant activity during the three months ended July 31, 2022 is presented below:
WarrantsNumber of
Shares		Weighted
Average
Exercise
Price		Weighted
Average
Remaining
Contractual
Term		Aggregate
Intrinsic
Value
Balance Outstanding, April 30, 2022649,174 $4.70 1.96$— 
Granted— $— — — 
Exercised— $— — — 
Surrendered— $— — — 
Expired(224,174)$6.87 — — 
Balance Outstanding, July 31, 2022425,000 $4.70 1.96$— 
Exercisable, July 31, 2022400,000 $4.89 1.80$— 
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 $1.00 4.74200,000 
$4.89 $4.89 50,000 $4.89 1.7050,000 
$5.85 $5.85 50,000 $5.85 4.0950,000 
$6.00 $6.00 100,000 $6.00 1.60100,000 
$6.99 $6.99 25,000 $0.00 0.00— 
 425,000   400,000 
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 36,331 $4.00 2.0036,331 
$4.50 to $5.20
$4.94 135,510 $4.99 1.52134,877 
$5.95 to $6.28
$5.95 28,000 $5.95 0.0628,000 
$7.17 to $7.55
$7.45 472,592 $7.46 1.07464,592 
$8.57 to $9.07
$8.98 122,749 $8.96 0.44122,749 
795,182 786,549 
Summary of Stock Option Activity A summary of the Company’s stock option activity for employees and directors during the three months ended July 31, 2022, is presented below:
OptionsNumber of
Shares		Weighted
Average
Exercise
Price		Weighted
Average
Remaining
Contractual
Term		Aggregate
Intrinsic
Value
Balance Outstanding, April 30, 2022
860,182 $7.03 1.25$— 
Granted— — — — 
Exercised— — — — 
Forfeited(36,000)8.98 — — 
Expired(29,000)4.19 — — 
Balance Outstanding, July 31, 2022
795,182 $7.05 1.07$— 
Exercisable, July 31, 2022
786,549 $7.05 1.06$— 
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:

Three Months Ended July 31,
20222021
RSUs$41,053 $446,777 
Restricted Stock— 10,527 
Stock options5,277 85,408 
Total stock-based compensation expense$46,330 $542,712