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Background, Basis of Presentation and Liquidity (Details Narrative) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Oct. 31, 2021
Jul. 31, 2021
Dec. 23, 2020
Nov. 20, 2020
Sep. 18, 2020
Oct. 24, 2019
Apr. 08, 2019
Jan. 07, 2019
Oct. 31, 2021
Oct. 31, 2020
Oct. 31, 2021
Oct. 31, 2020
Apr. 30, 2021
Jul. 01, 2019
Product Information [Line Items]                            
Net Income (Loss) Attributable to Parent                 $ 5,171 $ 3,024 $ 8,250 $ 6,409 $ 14,800  
Net Cash Provided by (Used in) Operating Activities                     10,375 $ 5,682 $ 11,700  
Cash $ 72,600               $ 72,600   $ 72,600      
Number of common stock shares sold             1,542,000              
Deferred Offering Costs       $ 100,000                    
A.G.P Alliance Global Partners [Member]                            
Product Information [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] | A.G.P Alliance Global Partners [Member]                            
Product Information [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            
[custom:PaymentOfSalesCommission]               $ 800            
2020 ATM Facility [Member] | A.G.P Alliance Global Partners [Member]                            
Product Information [Line Items]                            
Proceeds from initial public offering       $ 50,000                    
Number of common stock shares sold                     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      
[custom:PaymentOfSalesCommission]                     $ 1,600      
Stock Purchase Agreement [Member] | Aspire Capital Fund, LLC [Member]                            
Product Information [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 $ 1,000 $ 11,800     $ 4,000                  
Combined purchase price per share   $ 3.17     $ 0.63                  
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                      
Stock Purchase Agreement [Member] | Aspire Capital Fund, LLC [Member] | Maximum [Member]                            
Product Information [Line Items]                            
Aggregate purchase of common stock           $ 10,000                
Stock Purchase Agreement One [Member] | Aspire Capital Fund, LLC [Member]                            
Product Information [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