Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Schedule of Stock Warrant Activity (Details)

v3.20.2
Stockholders' Equity - Schedule of Stock Warrant Activity (Details)
 3 Months Ended
Jul. 31, 2020
$ / shares
shares
Number of Warrants Outstanding, End of Period | shares 746,753
Warrants exercisable at end of period | shares 389,611
Weighted Average Exercise Price of Warrants Outstanding, End of Period $ 13.82
Weighted Average Exercise Price, exercisable at end of period 20.07
Weighted average fair value of warrants granted during the period
Weighted Average Remaining Contractual Life in Years, End of Period 3 years 7 months 13 days
Warrants with No Class Designation [Member]  
Number of Warrants Outstanding, Beginning of Period | shares 527,378
Number of Warrants, Granted | shares
Number of Warrants, Exercised | shares
Number of Warrants, Forfeited | shares
Number of Warrants, Canceled | shares
Number of Warrants Outstanding, End of Period | shares 527,378
Weighted Average Exercise Price of Warrants Outstanding, Beginning of Period $ 14.83
Weighted Average Exercise Price, Granted
Weighted Average Exercise Price, Exercised
Weighted Average Exercise Price, Forfeited, with no financial effect
Weighted Average Exercise Price, Canceled
Weighted Average Exercise Price of Warrants Outstanding, End of Period $ 14.83
Weighted Average Remaining Contractual Life in Years, Beginning of Period 3 years 8 months 23 days
Weighted Average Remaining Contractual Life in Years, Granted 0 years
Weighted Average Remaining Contractual Life in Years, End of Period 3 years 5 months 23 days
Class A Warrants [Member]  
Number of Warrants Outstanding, Beginning of Period | shares 219,375
Number of Warrants, Granted | shares
Number of Warrants, Exercised | shares
Number of Warrants, Forfeited | shares
Number of Warrants, Canceled | shares
Number of Warrants Outstanding, End of Period | shares 219,375
Weighted Average Exercise Price of Warrants Outstanding, Beginning of Period $ 11.40
Weighted Average Exercise Price, Granted
Weighted Average Exercise Price, Exercised
Weighted Average Exercise Price, Forfeited, with no financial effect
Weighted Average Exercise Price, Canceled
Weighted Average Exercise Price of Warrants Outstanding, End of Period $ 11.40
Weighted Average Remaining Contractual Life in Years, Beginning of Period 4 years 2 months 19 days
Weighted Average Remaining Contractual Life in Years, Granted 0 years
Weighted Average Remaining Contractual Life in Years, End of Period 3 years 11 months 19 days