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Stockholders' Equity (Tables)
 3 Months Ended
Jul. 31, 2021
Stockholders' Equity Note [Abstract]  
Schedule of Restricted Stock Unit Activity
A summary of the Company’s RSU activity during the three months ended July 31, 2021 is presented below:
Restricted Stock UnitsNumber of SharesWeighted Average Grant Price
Unvested balance outstanding, April 30, 2021549,972 $6.58 
Granted127,542 6.97 
Forfeits(7,920)9.37 
Vested(15,657)6.26 
Expired— — 
Unvested balance outstanding, July 31, 2021653,937 $6.07 
Summary of Warrant Activity A summary of the Company’s warrant activity during the three months ended July 31, 2021 is presented below:
WarrantsNumber of
Shares		Weighted
Average
Exercise
Price		Weighted
Average
Remaining
Contractual
Term		Aggregate
Intrinsic
Value
Balance Outstanding, April 30, 2021374,174 $6.37 1.90$— 
Granted25,000 $6.99 4.98— 
Exercised— $— — — 
Surrendered— $— — — 
Expired— $— — — 
Balance Outstanding, July 31, 2021399,174 $6.41 1.85$144,000 
Exercisable, July 31, 2021374,174 $6.37 1.54$144,000 
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 3.4450,000 
$6.00 $6.00 100,000 $6.00 3.09100,000 
$6.87 $6.87 224,174 $6.87 1.48224,174 
$6.99 $6.99 25,000 $— 0.00— 
 399,174   374,174 
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
$2.28 to $2.76
$2.76 10,423 $2.76 0.1710,423 
$3.24 to $4.38
$3.82 183,249 $3.80 1.03168,914 
$4.50 to $5.20
$4.94 354,778 $4.93 1.39310,885 
$5.95 to $6.28
$5.95 28,000 $5.95 1.0628,000 
$7.17 to $7.55
$7.45 473,425 $7.46 2.07465,425 
$8.57 to $9.07
$8.98 157,749 $8.98 1.44157,749 
1,207,624 1,141,396 
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, 2021, 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(5,097)6.16 — — 
Forfeited(1,752)4.68 — — 
Expired— — — — 
Balance Outstanding, July 31, 2021
1,207,624 $6.29 1.65$1,150,849 
Exercisable, July 31, 2021
1,141,396 $6.36 1.60$1,044,364