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Background and Liquidity (Details Narrative) - USD ($)
 3 Months Ended 12 Months Ended
May 05, 2020
Oct. 24, 2019
Apr. 08, 2019
Jan. 07, 2019
Aug. 13, 2018
Apr. 30, 2020
Apr. 30, 2020
Apr. 30, 2019
Accumulated deficit           $ (220,136,000) $ (220,136,000) $ (209,784,000)
Cash, cash equivalents and restricted cash, at carrying value           $ 10,930,000 10,930,000 17,159,000
Revenues             $ 1,700,000 $ 600,000
Number of common stock shares sold     1,542,000          
Aggregate offering price     $ 15,700,000          
Pre-funded Warrants [Member]                
Warrant to purchase shares common stock     3,385,680          
Over-Allotment Option [Member]                
Number of common stock shares sold     642,000          
Stock Purchase Agreement [Member] | Aspire Capital Fund, LLC [Member]                
Aggregate purchase of common stock   $ 10,000,000     $ 10,000,000      
Percentage of outstanding common stock limit for shareholder approval         19.99%      
Number of shares can be issued based upon outstanding percentage         183,591      
Common stock issued for commitment fee         21,429      
Number of common stock shares sold   162,162            
Proceeds from issuance or sale of equity, net of issuance costs   $ 949,259            
Combined purchase price per share   $ 5.85            
Stock Purchase Agreement [Member] | Aspire Capital Fund, LLC [Member] | December 20, 2019 [Member]                
Stock issued for new issue, shares   5,400,000            
Stock Purchase Agreement [Member] | Aspire Capital Fund, LLC [Member] | Maximum [Member]                
Percentage of outstanding common stock limit for shareholder approval   19.99%            
Number of shares can be issued based upon outstanding percentage   1,219,010            
Common stock issued for commitment fee   194,805            
Combined purchase price per share           $ 0.82 $ 0.82  
Stock issued for new issue, shares           1,399,205 1,399,205  
Stock issued for new issue, value           $ 1,100,000 $ 1,100,000  
Securities Purchase Agreement [Member]                
Warrant to purchase shares common stock     4,927,680          
2019 ATM Facility [Member] | A.G.P./ Alliance Global Partners [Member]                
Number of common stock shares sold             5,101,405  
Proceeds from issuance or sale of equity, net of issuance costs             $ 3,800,000  
Combined purchase price per share           $ 0.74 $ 0.74  
Aggregate offering price       $ 25,000,000        
Payment of sales commission             $ 122,530  
Subsequent Event [Member] | Paycheck Protection Program [Member]                
Proceeds from loan $ 900,000