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Stockholders' Equity (Tables)
 9 Months Ended
Jan. 31, 2022
Stockholders' Equity Note [Abstract]  
Schedule of Restricted Stock Unit Activity
A summary of the Company’s RSU activity during the nine months ended January 31, 2022 is presented below:
Restricted Stock UnitsNumber of SharesWeighted Average Grant Price
Unvested balance outstanding, April 30, 2021549,972 $6.58 
Granted514,142 5.62 
Forfeits(36,353)9.67 
Vested(75,124)(1)4.54 
Expired— — 
Unvested balance outstanding, January 31, 2022952,637 $4.84 
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(1) Includes 1,416 RSUs that will be issued in the fourth quarter of fiscal year 2022.
Summary of Warrant Activity A summary of the Company’s warrant activity during the nine months ended January 31, 2022 is presented below:
WarrantsNumber of
Shares		Weighted
Average
Exercise
Price		Weighted
Average
Remaining
Contractual
Term		Aggregate
Intrinsic
Value
Balance Outstanding, April 30, 2021374,174 $6.37 1.90$— 
Granted75,000 $6.23 4.55— 
Exercised— $— — — 
Surrendered— $— — — 
Expired— $— — — 
Balance Outstanding, January 31, 2022449,174 $6.35 1.71$— 
Exercisable, January 31, 2022424,174 $6.31 1.55$— 
Share-based Payment Arrangement, Option, Exercise Price Range
OUTSTANDING WARRANTSEXERCISABLE WARRANTS
Exercise
Price		Weighted
Average
Exercise
Price		Outstanding
No. of
Warrants		Weighted
Average
Exercise
Price		Weighted
Average
Remaining Life
In Years		Exercisable
No. of
Warrants
$4.89 $4.89 50,000 $4.89 2.1950,000 
$5.85 $5.85 50,000 $5.85 4.5850,000 
$6.00 $6.00 100,000 $6.00 2.09100,000 
$6.87 $6.87 224,174 $6.87 0.48224,174 
$6.99 $6.99 25,000 
 449,174   424,174 
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
$4.14 115,890 $4.15 0.94103,389 
$4.50 to $5.20
$4.99 153,944 $5.03 1.77137,394 
$5.95 to $6.28
$5.95 28,000 $5.95 0.5528,000 
$7.17 to $7.55
$7.45 473,092 $7.46 1.57465,092 
$8.57 to $9.07
$8.98 157,749 $8.98 0.93157,749 
928,675 891,624 
Summary of Stock Option Activity A summary of the Company’s stock option activity for employees and directors during the nine months ended January 31, 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(4,586)4.59 — — 
Expired(22,793)3.21 — — 
Balance Outstanding, January 31, 2022
928,675 $6.84 1.41$— 
Exercisable, January 31, 2022
891,264 $6.92 1.38$—