| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| SC 13G/A | Open Document | Open Filing | SC 13G/A | Dec 23, 2021 | ||
| SC 13G/A | Open Document | Open Filing | SC 13G/A | Dec 23, 2021 | ||
| 4/A | Open Document | Open Filing | Aug 6, 2021 | Jul 9, 2021 | 000-15415 | |
| 4 | Open Document | Open Filing | Jul 15, 2021 | Jul 9, 2021 | 000-15415 | |
| 4 | Open Document | Open Filing | Jan 14, 2020 | Dec 16, 2019 | 000-15415 | |
| 4 | Open Document | Open Filing | Mar 7, 2019 | Mar 5, 2019 | 000-15415 | |
| 4 | Open Document | Open Filing | Jan 16, 2019 | Dec 29, 2018 | 000-15415 | |
| 4 | Open Document | Open Filing | Jan 23, 2018 | Jan 23, 2018 | 000-15415 | |
| 4/A | Open Document | Open Filing | Jan 5, 2018 | Dec 29, 2017 | 000-15415 | |
| 4 | Open Document | Open Filing | Jan 5, 2018 | Dec 29, 2017 | 000-15415 | |
| 4 | Open Document | Open Filing | Jan 25, 2017 | Jan 18, 2017 | 000-15415 | |
| 4 | Open Document | Open Filing | Jan 19, 2017 | Jan 12, 2017 | 000-15415 | |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 8, 2016 | Aug 5, 2016 | 000-15415 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jan 14, 2016 | Jan 14, 2016 | 000-15415 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Jan 7, 2015 | Jan 2, 2015 | 000-15415 |
| 3 | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 27, 2014 | Mar 25, 2014 | 000-15415 |