| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 19 Apr 2023 | 17 Apr 2023 | 000-15535 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 02 Feb 2023 | 31 Jan 2023 | 000-15535 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 14 Sep 2022 | 13 Sep 2022 | 000-15535 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 21 Jun 2022 | 16 Jun 2022 | 000-15535 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 16 Jun 2022 | 15 Jun 2022 | 000-15535 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 25 Apr 2022 | 21 Apr 2022 | 000-15535 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 21 Jun 2021 | 16 Jun 2021 | 000-15535 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 20 Apr 2021 | 16 Apr 2021 | 000-15535 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 19 Jan 2021 | 14 Jan 2021 | 000-15535 |
| 4 | Open Document | Open Filing | FORM 4 | 10 Jul 2020 | 08 Jul 2020 | 000-15535 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 26 Jun 2020 | 24 Jun 2020 | 000-15535 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 18 Jun 2020 | 16 Jun 2020 | 000-15535 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 22 Apr 2020 | 20 Apr 2020 | 000-15535 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 10 Apr 2020 | 09 Apr 2020 | 000-15535 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 09 Dec 2019 | 05 Dec 2019 | 000-15535 |
| 4/A | Open Document | Open Filing | OWNERSHIP DOCUMENT | 02 Aug 2017 | 27 Jul 2017 | 000-15535 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 28 Jul 2017 | 27 Jul 2017 | 000-15535 |
| 4 | Open Document | Open Filing | FORM 4 | 22 Dec 2016 | 20 Dec 2016 | 000-15535 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 06 Jul 2015 | 20 Jun 2015 | 000-15535 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 02 Jun 2015 | 31 May 2015 | 000-15535 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 22 Apr 2015 | 17 Mar 2011 | 000-15535 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 22 Apr 2015 | 13 Nov 1992 | 000-15535 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | 06 Jan 2015 | 02 Jan 2015 | 000-15535 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 07 Aug 2014 | 06 Aug 2014 | 000-15535 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 02 Apr 2013 | 02 Apr 2013 | 000-15535 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 21 Jun 2012 | 20 Jun 2012 | 000-15535 |