Consolidated Balance Sheets (Parentheticals) - $ / shares	May 31, 2022	May 31, 2021
Preferred stock, par value per share (in dollars per share)	$ 1.00	$ 1.00
Preferred stock, shares authorized (in shares)	2,000,000.0	2,000,000.0
Preferred stock issued (in shares)	0	0
Preferred stock, outstanding (in shares)	0	0
Common Stock
Common Stock, par value per share (in dollars per share)	$ 0.01	$ 0.01
Common Stock, shares authorized (in shares)	70,000,000.0	70,000,000.0
Common Stock, shares issued	42,900,000	42,900,000
Common Stock, shares outstanding (in shares)	32,469,019	32,700,000
Class A Stock
Common Stock, par value per share (in dollars per share)	$ 0.01	$ 0.01
Common Stock, shares authorized (in shares)	4,000,000	4,000,000.0
Common Stock, shares issued	1,700,000	1,700,000
Common Stock, shares outstanding (in shares)	1,656,200	1,700,000