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STOCK OPTIONS AND WARRANTS (Tables)
 3 Months Ended
Jul. 31, 2022
Share-Based Payment Arrangement [Abstract]  
Assumptions for options
        
   Three Months Ended July 31, 
   2022   2021 
Risk-free interest rate   2.9%    0.87% 
Expected volatility   139%    113% 
Expected lives (years)   2.5    2.5 
Expected dividend yield   0.00%    0.00% 
Schedule of stock option activity
          
Options  Weighted Average Exercise Price per Share   Weighted Average Grant Date Fair Value per Share 
Outstanding, April 30, 2022   40,900   $53.05 
Issued   1,002    2.27 
Forfeited   (3,633)   104.62 
Outstanding, July 31, 2022   38,269   $46.83 
Exercisable, July 31, 2022   35,769   $49.92 
Vested and expected to vest   38,269   $46.83 
Unvested stock option activity
           
    Options     Weighted
Average
Grant Date
Fair Value
per Share		  
             
Unvested, April 30, 2022     4,000     $ –  
Issued     1,002       2.27  
Vested     (2,502 )     –  
Forfeited     –       –  
Unvested, July 31, 2022     2,500     $ 2.50  
Schedule of options by exercise price
                               
Exercise Price     Number of
Options
Outstanding		     Weighted
Average
Remaining
Contractual Life
(Years) of
Outstanding
Options		     Weighted
Average
Exercisable
Price Per Share		     Number of
Options
Exercisable		     Weighted Average
Exercise Price Per Share
of Exercisable
Options		  
                                             
$ 82.95       333       0.10     $ 82.95       333     $ 82.95  
$ 83.70       6,000       0.25     $ 83.70       6,000     $ 83.70  
$ 80.10       800       1.10     $ 80.10       800     $ 80.10  
$ 80.85       667       0.38     $ 80.85       667     $ 80.85  
$ 102.45       333       0.46     $ 102.45       333     $ 102.45  
$ 97.35       333       0.60     $ 97.35       333     $ 97.35  
$ 74.25       6,000       0.98     $ 74.25       6,000     $ 74.25  
$ 57.00       800       2.15     $ 57.00       800     $ 57.00  
$ 60.60       667       0.88     $ 60.60       667     $ 60.60  
$ 55.50       333       0.95     $ 55.50       333     $ 55.50  
$ 51.00       333       1.10     $ 51.00       333     $ 51.00  
$ 61.20       6,000       1.46     $ 61.20       6,000     $ 61.20  
$ 36.00       667       1.38     $ 36.00       667     $ 36.00  
$ 37.05       333       1.46     $ 37.05       333     $ 37.05  
$ 15.75       333       1.60     $ 15.70       333     $ 15.70  
$ 10.05       6,000       2.05     $ 10.05       6,000     $ 10.05  
$ 26.55       667       1.88     $ 26.55       667     $ 26.55  
$ 16.20       334       1.96     $ 16.20       334     $ 16.20  
$ 3.19       334       2.10     $ 3.19       334     $ 3.19  
$ 2.50       6,000       2.65     $ 2.50       3,500     $ 2.50  
$ 2.29       668       2.38     $ 2.29       668     $ 2.29  
$ 2.24       334       2.46     $ 2.24       334     $ 2.24  
  Total       38,269       1.19     $ 46.83       35,769     $ 46.83  
Schedule of warrant activity
           
    Warrants    

Weighted
Average
Exercise Price

Per Share

  
Outstanding, April 30, 2022     10,772,736     $ 4.59  
Issued     -       –  
Exercised     (880,000 )     –  
Expired     (1,889 )     –  
Outstanding, July 31, 2022     9,890,847       –  
Exercisable, July 31, 2022     9,890,847     $ 4.99  
Schedule of warrants outstanding and exercisable
                 
Exercise Prices   Number of
Warrant Shares
Exercisable at
July 31, 2022		     Weighted
Average
Remaining
Contractual
Life Years		     Weighted
Average
Exercise Price Per Share		  
                   
$4.25     1,506,141       4.03          
$5.3125     264,706       4.03          
$5.00     7,000,000       4.07          
$6.25     1,050,000       4.05          
$0.001     70,000       –          
      9,890,847       4.06     $ 4.99