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Background and Liquidity (Details Narrative) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Apr. 30, 2022
Dec. 23, 2020
Nov. 20, 2020
Sep. 18, 2020
Oct. 24, 2019
Apr. 08, 2019
Jan. 07, 2019
Apr. 30, 2022
Apr. 30, 2021
Property, Plant and Equipment [Line Items]                  
Net Income (Loss) Attributable to Parent               $ 18,874 $ 14,760
Net Cash Provided by (Used in) Operating Activities               21,296 11,674
Cash $ 7,900             7,900  
Short-Term Investments $ 49,384             49,384
Proceeds from initial public offering               $ 66,166
Number of common stock shares sold           1,542,000      
Deferred Offering Costs     $ 100,000            
Alliance Global Partners [Member]                  
Property, Plant and Equipment [Line Items]                  
Number of common stock shares sold             12,342,506    
Proceeds from issuance or sale of equity, net of issuance costs             $ 18,700    
Combined purchase price per share             $ 1.51    
2019 ATM Facility [Member] | Alliance Global Partners [Member]                  
Property, Plant and Equipment [Line Items]                  
Proceeds from initial public offering             $ 25,000    
Number of common stock shares sold             17,595,472    
Proceeds from issuance or sale of equity, net of issuance costs             $ 23,400    
Combined purchase price per share             $ 1.33    
Payment of sales commission             $ 800    
2020 ATM Facility [Member]                  
Property, Plant and Equipment [Line Items]                  
Proceeds from issuance or sale of equity, net of issuance costs               75,000  
Payment of sales commission               $ 25,000  
2020 ATM Facility [Member] | Alliance Global Partners [Member]                  
Property, Plant and Equipment [Line Items]                  
Number of common stock shares sold     17,179,883         17,179,883  
Proceeds from issuance or sale of equity, net of issuance costs               $ 50,000  
Combined purchase price per share $ 2.91             $ 2.91 $ 2.91
Payment of sales commission               $ 1,600  
Proceeds from initial public offering     $ 50,000            
2020 ATM Facility [Member] | Alliance Global Partners [Member] | Maximum [Member]                  
Property, Plant and Equipment [Line Items]                  
Aggregate purchase of common stock     $ 100,000            
Stock Purchase Agreement [Member] | Aspire Capital Fund, LLC [Member]                  
Property, Plant and Equipment [Line Items]                  
Number of common stock shares sold 3,722,251     6,424,205          
Proceeds from issuance or sale of equity, net of issuance costs $ 11,800     $ 4,000          
Combined purchase price per share $ 3.17     $ 0.63       $ 3.17  
Aggregate purchase of common stock       $ 12,500          
Percentage of outstanding common stock   19.99%   19.99%          
Shares can be issued based upon outstanding percentage       3,722,251          
Additional sales of common stock shares sold   9,864,706              
Proceeds from issuance or sale of equity, net of issuance costs $ 1,000                
Stock Purchase Agreement [Member] | Aspire Capital Fund, LLC [Member] | Maximum [Member]                  
Property, Plant and Equipment [Line Items]                  
Aggregate purchase of common stock         $ 10,000        
Stock Purchase Agreement One [Member] | Aspire Capital Fund, LLC [Member]                  
Property, Plant and Equipment [Line Items]                  
Number of common stock shares sold               5,025,000  
Proceeds from issuance or sale of equity, net of issuance costs               $ 2,900  
Combined purchase price per share $ 0.57             $ 0.57  
Management [Member]                  
Property, Plant and Equipment [Line Items]                  
Net Income (Loss) Attributable to Parent               $ 18,900 $ 14,800
Net Cash Provided by (Used in) Operating Activities               $ 21,400 $ 11,700