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Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity - Share-based Payment Arrangement, Option, Exercise Price Range (Details)

v3.20.4
Stockholders' Equity - Share-based Payment Arrangement, Option, Exercise Price Range (Details) - $ / shares
9 Months Ended
Jan. 31, 2021
Jan. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding (in shares) 1,260,213 2,776,778
Exercisable (in shares) 1,038,024
Warrant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding (in shares) 374,174 566,223
Warrant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exercisable (in shares) 374,174
Warrant | $4.89
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum exercise price (in dollars per share) $ 4.89
Maximum exercise price (in dollars per share) 4.89
Weighted average exercise price (in dollars per share) $ 4.89
Outstanding (in shares) 50,000
Weighted average exercise price (in dollars per share) $ 4.89
Weighted average remaining life in years 3 years 5 months 8 days
Exercisable (in shares) 50,000
Warrant | $6.00
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum exercise price (in dollars per share) $ 6.00
Maximum exercise price (in dollars per share) 6.00
Weighted average exercise price (in dollars per share) $ 6.00
Outstanding (in shares) 100,000
Weighted average exercise price (in dollars per share) $ 6.00
Weighted average remaining life in years 3 years 1 month 2 days
Exercisable (in shares) 100,000
Warrant | $6.87
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Minimum exercise price (in dollars per share) $ 6.87
Maximum exercise price (in dollars per share) 6.87
Weighted average exercise price (in dollars per share) $ 6.87
Outstanding (in shares) 224,174
Weighted average exercise price (in dollars per share) $ 6.87
Weighted average remaining life in years 1 year 5 months 23 days
Exercisable (in shares) 224,174