| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | FORM 4 | Jun 3, 2021 | Jun 1, 2021 | 000-24993 |
| 4 | Open Document | Open Filing | FORM 4 | May 28, 2021 | May 27, 2021 | 000-24993 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 5, 2020 | Jun 3, 2020 | 000-24993 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 17, 2020 | Mar 17, 2020 | 000-24993 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jun 7, 2019 | Jun 5, 2019 | 000-24993 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Jun 6, 2018 | Jun 5, 2018 | 000-24993 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Jun 15, 2017 | Jun 13, 2017 | 000-24993 |
| 4 | Open Document | Open Filing | FORM 4 | Jun 15, 2016 | Jun 13, 2016 | 000-24993 |
| 3 | Open Document | Open Filing | FORM 3 | Aug 4, 2015 | Jul 31, 2015 | 000-24993 |