Annual report [Section 13 and 15(d), not S-K Item 405]

Convertible Instruments and Accrued Interest - Preferred stock (Details)

v3.26.1
Convertible Instruments and Accrued Interest - Preferred stock (Details)
shares in Thousands, $ in Thousands
 12 Months Ended
May 31, 2026
USD ($)
shares
May 31, 2025
USD ($)
shares
Class of Stock    
Accrued dividends | $ $ 9,647 $ 8,269
Series B Convertible Preferred Stock    
Class of Stock    
Shares of preferred stock outstanding 19 19
Common stock conversion rate 10 10
Total shares of common stock if converted 190 190
Undeclared dividends | $ $ 29 $ 24
Total shares of common stock if dividends converted 58 48
Series C Convertible Preferred Stock    
Class of Stock    
Shares of preferred stock outstanding 6 6
Common stock conversion rate 2,000 2,000
Total shares of common stock if converted 12,390 12,670
Accrued dividends | $ $ 4,302 $ 3,769
Total shares of common stock if dividends converted 8,604 7,538
Series D Convertible Preferred Stock    
Class of Stock    
Shares of preferred stock outstanding 9 9
Common stock conversion rate 1,250 1,250
Total shares of common stock if converted 10,565 10,565
Accrued dividends | $ $ 5,345 $ 4,500
Total shares of common stock if dividends converted 10,690 9,000