Quarterly report pursuant to Section 13 or 15(d)

Consolidated Balance Sheets (Parenthetical)

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Consolidated Balance Sheets (Parenthetical) - $ / shares
shares in Thousands
Feb. 29, 2024
May 31, 2023
Preferred stock, par value $ 0.001 $ 0.001
Preferred stock, shares authorized 5,000 5,000
Common stock, par value $ 0.001 $ 0.001
Common stock, shares authorized 1,750,000 1,750,000
Common stock, shares issued 990,368 919,053
Common stock, shares outstanding 989,925 918,610
Treasury stock, shares 443 443
Series B Convertible Preferred Stock    
Preferred stock, par value $ 0.001 $ 0.001
Preferred stock, shares authorized 400 400
Preferred stock, shares issued 19 19
Preferred stock, shares outstanding 19 19
Series C Convertible Preferred Stock    
Preferred stock, par value $ 0.001 $ 0.001
Preferred stock, shares authorized 8 8
Preferred stock, shares issued 6 6
Preferred stock, shares outstanding 6 6
Series D Convertible Preferred Stock    
Preferred stock, par value $ 0.001 $ 0.001
Preferred stock, shares authorized 12 12
Preferred stock, shares issued 9 9
Preferred stock, shares outstanding 9 9