Quarterly report [Sections 13 or 15(d)]

Convertible Instruments and Accrued Interest - Preferred stock (Details)

v3.25.2
Convertible Instruments and Accrued Interest - Preferred stock (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 12 Months Ended
Aug. 31, 2025
USD ($)
$ / shares
shares
May 31, 2025
USD ($)
shares
Class of Stock    
Accrued dividends | $ $ 8,642 $ 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 | $ $ 25 $ 24
Total shares of common stock if dividends converted 50 48
Preferred stock, liquidation preference per share ($ per share) | $ / shares $ 5  
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 12,670 12,670
Accrued dividends | $ $ 3,929 $ 3,769
Total shares of common stock if dividends converted 7,858 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 | $ $ 4,713 $ 4,500
Total shares of common stock if dividends converted 9,426 9,000
Series C and Series D Convertible Preferred Stock    
Class of Stock    
Preferred stock, liquidation preference per share ($ per share) | $ / shares $ 1,000