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Stockholders’ Equity (Details Narrative) - Series E Preferred Stock [Member] - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Apr. 30, 2021
Jan. 31, 2021
Jan. 31, 2021
Jan. 31, 2022
Class of Stock [Line Items]        
Loss on redemption $ 3,400      
Redemption price       $ 25.00
Liquidation preference price per share       $ 2.625
Dividends paid   $ 1,100 $ 3,200