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Note 14 - Preferred Stock (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Jul. 12, 2005
Apr. 30, 2021
Apr. 30, 2020
Oct. 31, 2020
Preferred Stock, Shares Issued, Total (in shares)   5,600   5,600
Preferred Class A [Member]        
Preferred Stock, Shares Issued, Total (in shares) 5,600      
Preferred Stock, Dividend Rate, Percentage 7.625%      
Preferred Stock, Liquidation Preference Per Share (in dollars per share) $ 25,000      
Preferred Stock, Depositary Shares, Number of Shares of Preferred Stock in Each Depositary Share (in shares) 0.001      
Payments of Dividends, Total   $ 0 $ 0