Quarterly report pursuant to Section 13 or 15(d)

Note 14 - Stockholders' Equity (Details Textual)

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Note 14 - Stockholders' Equity (Details Textual)
 3 Months Ended
Jun. 06, 2019
USD ($)
$ / shares
May 14, 2019
USD ($)
$ / shares
shares
Apr. 29, 2019
USD ($)
shares
Apr. 01, 2019
Dec. 06, 2018
$ / shares
shares
Jan. 31, 2021
USD ($)
Apr. 30, 2022
$ / shares
shares
Oct. 31, 2021
$ / shares
shares
Common Stock, Shares Authorized (in shares)         500,000,000   500,000,000 500,000,000
Common Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares         $ 0.0001   $ 0.0001 $ 0.0001
Preferred Stock, Shares Authorized (in shares)         10,000,000      
Preferred Stock, Par or Stated Value Per Share (in dollars per share) | $ / shares         $ 0.0001      
Common Stock, Shares, Issued, Total (in shares)         28,847,707   56,667,965 56,564,642
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (in shares)         34,100,000      
Class of Warrant or Right, Number of Securities Called by Each Warrant or Right (in shares)         1      
Class of Warrant or Right, Exercise Price of Warrants or Rights (in dollars per share) | $ / shares         $ 11.50   $ 11.50  
Preferred Stock, Shares Outstanding, Ending Balance (in shares)         2,450,980      
Convertible Preferred Stock, Redemption, Principal Investment | $ $ 25,000,000              
Convertible Preferred Stock, Additional Cumulative Amount, Accrue Annual Rate 7.00%              
Convertible Preferred Stock, Additional Cumulative Amount | $ $ 6,100,000              
Convertible Preferred Stock, Convertible, Stock Price Trigger (in dollars per share) | $ / shares $ 13.00              
Debt Instrument, Consecutive Period (Day) 30 days              
Par Value of Warrant in APIC | $     $ 26,300,000          
Public Offering [Member]                
Stock Issued During Period, Shares, New Issues (in shares)   18,098,166            
Shares Issued, Price Per Share (in dollars per share) | $ / shares   $ 4.50            
Proceeds from Issuance of Common Stock | $   $ 77,400,000            
Public Offering [Member] | Directors, Officers, Stockholders [Member]                
Stock Issued During Period, Shares, New Issues (in shares)   3,980,166            
Shares Issued, Price Per Share (in dollars per share) | $ / shares   $ 4.50            
Percentage of Shares Issued   25.00%            
Public Warrants [Member]                
Number of Shares Issued in Exchange for Warrants (in shares)     2,101,213          
Class of Warrant or Right, Outstanding (in shares)             13,017,677 13,017,777
Warrant Exchange for Common Stock, Exchange Ratio       0.2105        
Class of Warrant or Right, Exchanged During Period (in shares)     9,982,123          
Private Warrants [Member]                
Number of Shares Issued in Exchange for Warrants (in shares)     1,707,175          
Class of Warrant or Right, Outstanding (in shares)             0 0
Warrant Exchange for Common Stock, Exchange Ratio       0.1538        
Class of Warrant or Right, Exchanged During Period (in shares)     11,100,000          
Series A Preferred Stock [Member]                
Preferred Stock, Dividend Rate, Percentage         0.00%      
Dividends, Preferred Stock, Total | $           $ 0    
Preferred Stock, Convertible, Conversion Ratio 1