| Date Filed | Type | Description |
| 03/14/2023 |
10-K
| Annual Report for the period ended December 31, 2022 |
| 03/16/2022 |
10-K
| Annual Report for the period ended December 31, 2021 |
| 03/11/2021 |
10-K
| Annual Report for the period ended December 31, 2020 |
| 03/16/2020 |
10-K
| Annual Report for the period ended December 31, 2019 |
| 03/19/2019 |
10-K
| Annual Report for the period ended December 31, 2018 |
| 03/15/2018 |
10-K
| Annual Report for the period ended December 31, 2017 |
| 03/15/2017 |
10-K
| Annual Report for the period ended December 31, 2016 |
| 03/15/2016 |
10-KT
| Form 10-KT - Transition reports [Rule 13a-10 or 15d-10] |
| 08/07/2015 |
10-K
| Annual Report for the period ended May 31, 2015 |
| 08/08/2014 |
10-K
| Annual Report for the period ended May 31, 2014 |
| 08/12/2013 |
10-K
| Annual Report for the period ended May 31, 2013 |
| 08/07/2012 |
10-K
| Annual Report for the period ended May 31, 2012 |
| 08/01/2011 |
10-K
| Annual Report for the period ended May 31, 2011 |
| 08/06/2010 |
10-K
| Annual Report for the period ended May 31, 2010 |
| 08/11/2009 |
10-K
| Annual Report for the period ended May 31, 2009 |
| 07/30/2008 |
10-K
| Annual Report for the period ended May 31, 2008 |
| 08/13/2007 |
10-K
| Annual Report for the period ended May 31, 2007 |
| 08/14/2006 |
10-K
| Annual Report for the period ended May 31, 2006 |
| 08/15/2005 |
10-K
| Annual Report for the period ended May 31, 2005 |
| 04/14/2005 |
10-K/A
| Annual Report for the period ended May 31, 2004 [amend] |
| 08/25/2004 |
10-K
| Annual Report for the period ended May 31, 2004 |
| 08/26/2003 |
10-K
| Annual Report for the period ended May 31, 2003 |
| 08/28/2002 |
10-K
| Annual Report for the period ended May 31, 2002 |
| 08/29/2001 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 05/08/2001 |
10-K405/A
| Form 10-K405/A - Annual report [Sections 13 and 15(d), S-K Item 405] [Amend] |
| 08/28/2000 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 08/27/1999 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 08/17/1998 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 08/14/1997 |
10-K405
| Form 10-K405 - Annual report [Sections 13 and 15(d), S-K Item 405] |
| 08/13/1996 |
10-K
| Annual Report for the period ended May 31, 1996 |
| 09/13/1995 |
10-K
| Annual Report for the period ended May 31, 1995 |