| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES | 16 Feb 2022 | 14 Feb 2022 | 000-18548 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 03 Feb 2022 | 02 Feb 2022 | 000-18548 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 03 Aug 2021 | 02 Aug 2021 | 000-18548 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 13 Jul 2021 | 10 Jul 2021 | 000-18548 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 14 May 2021 | 13 May 2021 | 000-18548 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 13 Apr 2021 | 10 Apr 2021 | 000-18548 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 14 Jul 2020 | 10 Jul 2020 | 000-18548 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 13 May 2020 | 12 May 2020 | 000-18548 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 16 Apr 2020 | 15 Apr 2020 | 000-18548 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 13 Apr 2020 | 10 Apr 2020 | 000-18548 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 10 Jul 2019 | 10 Jul 2019 | 000-18548 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 15 Apr 2019 | 12 Apr 2019 | 000-18548 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 11 Apr 2019 | 10 Apr 2019 | 000-18548 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | 11 Apr 2018 | 10 Apr 2018 | 000-18548 |
| 3 | Open Document | Open Filing | PRIMARY DOCUMENT | 13 Mar 2018 | 05 Mar 2018 | 000-18548 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | 25 Apr 2017 | 24 Apr 2017 | 000-49602 |
| 3 | Open Document | Open Filing | FORM 3 SUBMISSION | 25 Apr 2017 | 24 Apr 2017 | 000-49602 |