| Date Filed | Type | Description |
| 02/02/2023 |
10-K
| Annual Report for the period ended December 31, 2022 |
| 08/15/2022 |
10-K/A
| Annual Report for the period ended December 31, 2021 [amend] |
| 02/03/2022 |
10-K
| Annual Report for the period ended December 31, 2021 |
| 02/04/2021 |
10-K
| Annual Report for the period ended December 31, 2020 |
| 02/06/2020 |
10-K
| Annual Report for the period ended December 31, 2019 |
| 02/07/2019 |
10-K
| Annual Report for the period ended December 31, 2018 |
| 02/08/2018 |
10-K
| Annual Report for the period ended December 31, 2017 |
| 02/09/2017 |
10-K
| Annual Report for the period ended December 31, 2016 |
| 02/12/2016 |
10-K
| Annual Report for the period ended December 31, 2015 |
| 02/17/2015 |
10-K
| Annual Report for the period ended December 31, 2014 |
| 02/24/2014 |
10-K
| Annual Report for the period ended December 31, 2013 |
| 03/01/2013 |
10-K
| Annual Report for the period ended December 31, 2012 |
| 03/01/2012 |
10-K
| Annual Report for the period ended December 31, 2011 |
| 03/07/2011 |
10-K
| Annual Report for the period ended December 31, 2010 |
| 02/24/2010 |
10-K
| Annual Report for the period ended December 31, 2009 |
| 02/27/2009 |
10-K
| Annual Report for the period ended December 31, 2008 |
| 03/06/2008 |
10-K
| Annual Report for the period ended December 31, 2007 |
| 03/02/2007 |
10-K
| Annual Report for the period ended December 31, 2006 |
| 06/29/2006 |
10-K
| Annual Report for the period ended April 30, 2006 |
| 07/13/2005 |
10-K
| Annual Report for the period ended April 30, 2005 |
| 07/13/2004 |
10-K
| Annual Report for the period ended April 30, 2004 |
| 04/23/2004 |
10-K/A
| Annual Report for the period ended April 30, 2003 [amend] |
| 07/03/2003 |
10-K
| Annual Report for the period ended April 30, 2003 |
| 07/26/2002 |
10-K
| Annual Report for the period ended April 30, 2002 |
| 07/27/2001 |
10-K
| Annual Report for the period ended April 30, 2001 |
| 07/31/2000 |
10-K
| Annual Report for the period ended April 30, 2000 |