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Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Summary of Warrant Activity (Details)

v3.20.4
Stockholders' Equity - Summary of Warrant Activity (Details) - Warrant - USD ($)
6 Months Ended
Oct. 31, 2020
Apr. 30, 2020
Oct. 31, 2020
Number of Shares Ìý Ìý Ìý
Balance Outstanding, April 30, 2020 (in shares) Ìý Ìý 566,223
Granted (in shares) Ìý Ìý 0
Warrants exercised (in shares) Ìý Ìý (192,049)
Surrendered (in shares) Ìý Ìý 0
Expired (in shares) Ìý Ìý 0
Balance Outstanding, October 31, 2020 (in shares) 374,174 566,223 374,174
Exercisable, October 31, 2020 (in shares) 374,174 Ìý 374,174
Weighted Average Exercise Price Ìý Ìý Ìý
Balance Outstanding, April 30, 2020 (in dollars per share) Ìý Ìý $ 6.22
Granted (in dollars per share) Ìý Ìý 0
Exercised (in dollars per share) Ìý Ìý 5.60
Surrendered (in dollars per share) Ìý Ìý 0
Expired (in dollars per share) Ìý Ìý 0
Balance Outstanding, October 31, 2020 (in dollars per share) $ 6.37 $ 6.22 6.37
Exercisable, October 31, 2020 (in dollars per share) $ 6.37 Ìý $ 6.37
Weighted Average Remaining Contractual Term Ìý Ìý Ìý
Weighted Average Remaining Contractual Term 2 years 4 months 20 days 3 years 2 months 1 day Ìý
Weighted Average Remaining Contractual Term, Exercisable 2 years 4 months 20 days Ìý Ìý
Aggregate Intrinsic Value Ìý Ìý Ìý
Average Intrinsic Value $ 1,125,177 $ 950,100 $ 1,125,177
Aggregate Intrinsic Value, Exercisable $ 1,125,177 Ìý $ 1,125,177