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Consolidated Balance Sheets (Parentheticals) - $ / shares
Apr. 30, 2023
Apr. 30, 2022
Statement [Line Items]    
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 1,000,000 1,000,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 50,000,000 50,000,000
Common stock, shares issued (in shares) 13,701,468 13,642,185
Common stock, shares outstanding (in shares) 6,373,404 6,371,977
Treasury Stock, Common, Shares 7,328,064 7,270,208