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Stockholders' Equity (Tables)
 9 Months Ended
Jan. 31, 2021
Schedule of Restricted Stock Unit Activity
A summary of the Company’s RSU activity which were granted under the 2012 and 2018 Equity Incentive Plans during the nine months ended January 31, 2021 is presented below:
Restricted Stock UnitsNumber of SharesWeighted Average Grant Price
Unvested balance outstanding, April 30, 2020643,175 $5.64 
Granted251,521 9.82 
Exercised— — 
Forfeits(19,250)8.94 
Vested(206,109)12.46 
Expired— — 
Unvested balance outstanding, January 31, 2021669,337 $6.95 
Summary of Warrant Activity
A summary of the Company’s warrant activity during the nine months ended January 31, 2021 is presented below:
WarrantsNumber of
Shares		Weighted
Average
Exercise
Price		Weighted
Average
Remaining
Contractual
Term		Aggregate
Intrinsic
Value
Balance Outstanding, April 30, 2020566,223 $6.22 3.17$950,100 
Granted— $— — — 
Exercised(192,049)$5.60 — — 
Surrendered— $— — — 
Expired— $— — — 
Balance Outstanding, January 31, 2021374,174 $6.37 2.14$1,151,369 
Exercisable, January 31, 2021374,174 $6.37 2.14$1,151,369 
Warrant  
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 
 374,174   374,174 
Stock Incentive Plan and Stock Option Grants to Employees and Directors  
Share-based Payment Arrangement, Option, Exercise Price Range
OUTSTANDING OPTIONSEXERCISABLE OPTIONS
Exercise
Price		Weighted
Average
Exercise
Price		Outstanding
No. of
Options		Weighted
Average
Exercise
Price		Weighted
Average
Remaining Life
In Years		Exercisable
No. of
Options
$1.57 to $2.10
$1.92 29,167 $1.92 0.4429,167 
$2.28 to $2.76
$2.76 11,415 $2.76 0.6711,415 
$3.24 to $4.38
$3.82 188,639 $3.75 1.32146,804 
$4.50 to $5.20
$4.94 362,818 $4.95 1.82297,714 
$5.95 to $6.28
$6.10 66,000 $6.10 1.4766,000 
$7.17 to $7.55
$7.44 444,425 $7.43 2.62329,175 
$8.57 to $9.07
$8.98 157,749 $8.98 1.93157,749 
Options only1,260,213 1,038,024 
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, 2021, is presented below:
OptionsNumber of
Shares		Weighted
Average
Exercise
Price		Weighted
Average
Remaining
Contractual
Term		Aggregate
Intrinsic
Value
Balance Outstanding, April 30, 20202,740,539 $4.62 1.97$9,146,198 
Granted— $— — — 
Exercised(1,400,832)$10.80 — — 
Forfeited(7,585)$6.23 — — 
Expired(71,909)$3.98 — — 
Balance Outstanding, January 31, 2021
1,260,213 $6.13 2.08$4,184,115 
Exercisable, January 31, 2021
1,038,024 $6.14 1.94$3,432,509