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Property and Equipment, net (Details Narrative) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Oct. 31, 2020
Oct. 31, 2019
Oct. 31, 2020
Oct. 31, 2019
Property, Plant and Equipment [Abstract]        
Depreciation expense $ 36 $ 39 $ 73 $ 77