General form of registration statement for all companies including face-amount certificate companies

Convertible Instruments and Accrued Interest - Preferred stock (Details)

v3.23.2
Convertible Instruments and Accrued Interest - Preferred stock (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
 9 Months Ended 12 Months Ended
Feb. 28, 2023
USD ($)
$ / shares
shares
May 31, 2022
USD ($)
$ / shares
shares
May 31, 2021
USD ($)
shares
Class of Stock [Line Items]      
Accrued dividends | $ $ 4,935 $ 3,977 $ 2,647
Series B Convertible Preferred Stock      
Class of Stock [Line Items]      
Shares of preferred stock | shares 19 19 79
Common stock conversion rate 10 10  
Total shares of common stock if converted | shares 190 190  
Undeclared dividend | $ $ 14 $ 10 $ 18
Total shares of common stock if dividends converted | shares 28 20 36
Preferred Stock, Liquidation Preference Per Share | $ / shares $ 5.00 $ 5.00  
Preferred stock dividend, value per share | $ / shares   0.25  
Preferred stock conversion price, per share | $ / shares   $ 0.50  
Undeclared dividend, shares | shares   10  
Series C Convertible Preferred Stock      
Class of Stock [Line Items]      
Shares of preferred stock | shares 6 7 8
Common stock conversion rate 2,000 2,000  
Total shares of common stock if converted | shares 12,670 13,806  
Accrued dividends | $ $ 2,341 $ 2,014 $ 1,530
Total shares of common stock if dividends converted | shares 4,682 4,028 3,060
Preferred Stock, Liquidation Preference Per Share | $ / shares   $ 1,000  
Preferred stock dividend rate, as a percent   10.00%  
Preferred stock dividend, value per share | $ / shares   $ 0.50  
Preferred stock conversion price, per share | $ / shares   $ 0.50  
Series D Convertible Preferred Stock      
Class of Stock [Line Items]      
Shares of preferred stock | shares 9 9 9
Common stock conversion rate 1,250 1,250  
Total shares of common stock if converted | shares 10,565 10,565  
Accrued dividends | $ $ 2,594 $ 1,963 $ 1,117
Total shares of common stock if dividends converted | shares 5,188 3,926 2,234
Preferred Stock, Liquidation Preference Per Share | $ / shares   $ 1,000  
Preferred stock dividend rate, as a percent   10.00%  
Preferred stock dividend, value per share | $ / shares   $ 0.50  
Preferred stock conversion price, per share | $ / shares   $ 0.50  
Series C and Series D Convertible Preferred Stock      
Class of Stock [Line Items]      
Preferred Stock, Liquidation Preference Per Share | $ / shares $ 1,000