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Product Warranties (Tables)
12 Months Ended
Apr. 30, 2024
Product Warranties Disclosures [Abstract]  
Schedule of Product Warranty Liability [Table Text Block] As of April 30, 2024 and 2023, respectively, changes in the carrying amount of accrued product warranty costs, reported in accrued expenses on the consolidated balance sheets, were as follows (in thousands):
   

2024

   

2023

 

Balance at beginning of year

  $ 529     $ 519  

Warranty costs incurred

    (390 )     (499 )

Product warranty accrual

    403       509  

Balance at end of year

  $ 542     $ 529