| Date Filed | Type | Description |
| 04/17/2023 |
10-K
| Annual Report for the period ended December 31, 2022 |
| 04/15/2022 |
10-K
| Annual Report for the period ended December 31, 2021 |
| 04/08/2021 |
10-K
| Annual Report for the period ended December 31, 2020 |
| 06/03/2020 |
10-K/A
| Annual Report for the period ended December 31, 2019 [amend] |
| 05/19/2020 |
10-K
| Annual Report for the period ended December 31, 2019 |
| 04/16/2019 |
10-K
| Annual Report for the period ended December 31, 2018 |
| 04/16/2018 |
10-K
| Annual Report for the period ended December 31, 2017 |
| 04/14/2017 |
10-K
| Annual Report for the period ended December 31, 2016 |
| 12/15/2016 |
10-K
| Annual Report for the period ended December 31, 2015 |
| 09/15/2014 |
10-K
| Annual Report for the period ended May 31, 2014 |
| 09/13/2013 |
10-K
| Annual Report for the period ended May 31, 2013 |
| 09/13/2012 |
10-K
| Annual Report for the period ended May 31, 2012 |
| 08/29/2011 |
10-K
| Annual Report for the period ended May 31, 2011 |
| 02/17/2011 |
10-K/A
| Annual Report for the period ended May 31, 2009 [amend] |
| 09/23/2010 |
10-K/A
| Annual Report for the period ended May 31, 2010 [amend] |
| 09/16/2010 |
10-K/A
| Annual Report for the period ended May 31, 2010 [amend] |
| 09/14/2010 |
10-K
| Annual Report for the period ended May 31, 2010 |
| 09/15/2009 |
10-K
| Annual Report for the period ended May 31, 2009 |
| 09/15/2008 |
10-K
| Annual Report for the period ended May 31, 2008 |