Net Income (Loss) per Common Share (Details - Antidilutive shares) - shares shares in Thousands	3 Months Ended
	Jul. 31, 2021	Jul. 31, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dilutive effect of shares on diluted shares outstanding	6,888	4,091
Stock Option One [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dilutive effect of shares on diluted shares outstanding	29	2,064
Restricted Stock Units (RSUs) [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dilutive effect of shares on diluted shares outstanding	64	48
Performance Stock Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dilutive effect of shares on diluted shares outstanding	19	0
Convertible Notes [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dilutive effect of shares on diluted shares outstanding	6,776	0
Series E Preferred Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dilutive effect of shares on diluted shares outstanding	0	1,979