Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)	Jul. 31, 2019	Apr. 30, 2019
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	50,000,000	50,000,000
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	20,888,550	19,860,625
Common stock, shares outstanding	20,888,550	19,860,625
Convertible Series F Preferred Stock [Member]
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	1,250	1,250
Preferred stock, shares issued	634
Preferred stock, shares outstanding	634
Preferred stock, liquidation preference	$ 1,268,000	$ 1,268,000