Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical)

v3.22.0.1
Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares
Jan. 31, 2022
Apr. 30, 2021
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 7,096,723 7,065,621
Common stock, shares outstanding 7,096,723 7,065,621
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 0 0
Preferred stock, shares outstanding 0 0
Convertible Series G Preferred Stock [Member]    
Preferred stock, par value $ 0.001 $ 0.001
Preferred stock, shares authorized 127 127
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Convertible Series H Preferred Stock [Member]    
Preferred stock, par value $ 0.001 $ 0.001
Preferred stock, shares authorized 106,894 106,894
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0
Convertible Series I Preferred Stock [Member]    
Preferred stock, par value $ 0.001 $ 0.001
Preferred stock, shares authorized 921,666 921,666
Preferred stock, shares issued 0 0
Preferred stock, shares outstanding 0 0