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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Oct. 31, 2021
Apr. 30, 2021
CONSOLIDATED BALANCE SHEETS    
Common stock, par value (in dollars per share) $ 0.10 $ 0.10
Common stock, shares authorized 20,000,000 20,000,000
Common stock, shares issued 7,336,370 7,323,370