| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Dec 28, 2021 | Dec 23, 2021 | 000-17995 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Mar 3, 2021 | Mar 1, 2021 | 000-17995 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Feb 26, 2020 | Feb 24, 2020 | 000-17995 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Mar 11, 2019 | Mar 7, 2019 | 000-17995 |
| 4/A | Open Document | Open Filing | FORM 4/A SUBMISSION | Aug 23, 2018 | Aug 8, 2018 | 000-17995 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Aug 10, 2018 | Aug 8, 2018 | 000-17995 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Jun 13, 2018 | Jun 11, 2018 | 000-17995 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Feb 28, 2018 | Feb 26, 2018 | 000-17995 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | May 1, 2017 | Apr 27, 2017 | 000-17995 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Feb 15, 2017 | Feb 13, 2017 | 000-17995 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Aug 18, 2016 | Aug 16, 2016 | 000-17995 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Feb 22, 2016 | Feb 18, 2016 | 000-17995 |
| 4 | Open Document | Open Filing | FORM 4 SUBMISSION | Jul 23, 2015 | Jul 23, 2015 | 000-17995 |