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Property, Plant and Equipment and Leases (Details) - Schedule of Property, Plant and Equipment - USD ($)
$ in Thousands
Apr. 30, 2020
Apr. 30, 2019
Schedule of Property, Plant and Equipment [Abstract]    
Buildings and building improvements $ 2,692 $ 2,692
Machinery, equipment and furniture 57,916 57,157
60,608 59,849
Less, accumulated depreciation and amortization (49,341) (46,811)
$ 11,267 $ 13,038