| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | FORM 4 | May 19, 2021 | May 17, 2021 | 000-25837 |
| 4 | Open Document | Open Filing | FORM 4 | Mar 30, 2021 | Mar 28, 2021 | 000-25837 |
| 4 | Open Document | Open Filing | FORM 4 | Mar 10, 2021 | Mar 8, 2021 | 000-25837 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Mar 10, 2020 | Mar 8, 2020 | 000-25837 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Mar 13, 2019 | Mar 9, 2019 | 000-25837 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Mar 12, 2019 | Mar 8, 2019 | 000-25837 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Jun 20, 2018 | Jun 19, 2018 | 000-25837 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Jun 19, 2018 | Jun 15, 2018 | 000-25837 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Mar 29, 2018 | Mar 28, 2018 | 000-25837 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Mar 13, 2018 | Mar 9, 2018 | 000-25837 |
| 3 | Open Document | Open Filing | FORM 3 SUBMISSION | Feb 1, 2018 | Feb 1, 2018 | 000-25837 |