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Inventories (Details) - USD ($)
$ in Thousands
Jul. 31, 2020
Apr. 30, 2020
Inventories [Abstract]    
Finished Goods $ 34,975 $ 36,014
Work-in-Process 1,688 1,398
Paper and Other Materials 312 331
Total Inventories Before Estimated Sales Returns and LIFO Reserve 36,975 37,743
Inventory Value of Estimated Sales Returns 10,967 8,686
LIFO Reserve (2,891) (2,815)
Total Inventories $ 45,051 $ 43,614