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Inventories (Details) - USD ($)
$ in Thousands
Jan. 31, 2021
Apr. 30, 2020
Inventories [Abstract]    
Finished Goods $ 29,996 $ 36,014
Work-in-Process 1,660 1,398
Paper and Other Materials 269 331
Total Inventories Before Estimated Sales Returns and LIFO Reserve 31,925 37,743
Inventory Value of Estimated Sales Returns 11,800 8,686
LIFO Reserve (3,040) (2,815)
Total Inventories $ 40,685 $ 43,614