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Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Summary of Warrant Activity (Details)

v3.19.3.a.u2
Stockholders' Equity - Summary of Warrant Activity (Details) - Warrant - USD ($)
6 Months Ended
Oct. 31, 2019
Apr. 30, 2019
Oct. 31, 2019
Number of Shares Ìý Ìý Ìý
Balance Outstanding, April 30, 2019 (in shares) Ìý Ìý 731,152
Granted (in shares) Ìý Ìý 0
Exercised (in shares) Ìý Ìý (164,929)
Surrendered (in shares) Ìý Ìý 0
Expired (in shares) Ìý Ìý 0
Balance Outstanding, October 31, 2019 (in shares) 566,223 731,152 566,223
Exercisable, October 31, 2019 (in shares) 516,223 Ìý 516,223
Weighted Average Exercise Price Ìý Ìý Ìý
Balance Outstanding, April 30, 2019 (in dollars per share) Ìý Ìý $ 5.28
Granted (in dollars per share) Ìý Ìý 0
Exercised (in dollars per share) Ìý Ìý 2.05
Surrendered (in dollars per share) Ìý Ìý 0
Expired (in dollars per share) Ìý Ìý 0
Balance Outstanding, October 31, 2019 (in dollars per share) $ 6.22 $ 5.28 6.22
Exercisable, October 31, 2019 (in dollars per share) $ 6.35 Ìý $ 6.35
Weighted Average Remaining Contractual Term Ìý Ìý Ìý
Weighted Average Remaining Contractual Term 3 years 7 months 28 days 3 years 3 months 14 days Ìý
Weighted Average Remaining Contractual Term, Exercisable 3 years 7 months 2 days Ìý Ìý
Aggregate Intrinsic Value Ìý Ìý Ìý
Average Intrinsic Value $ 154,820 $ 413,296 $ 154,820
Aggregate Intrinsic Value, Exercisable $ 86,820 Ìý $ 86,820