| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 21, 2021 | Dec 19, 2021 | 000-06920 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 3, 2021 | Dec 2, 2021 | 000-06920 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Sep 2, 2021 | Sep 1, 2021 | 000-06920 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 9, 2021 | Apr 7, 2021 | 000-06920 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 22, 2020 | Dec 19, 2020 | 000-06920 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 7, 2020 | Dec 3, 2020 | 000-06920 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 23, 2019 | Dec 19, 2019 | 000-06920 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 9, 2019 | Dec 5, 2019 | 000-06920 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 21, 2018 | Dec 19, 2018 | 000-06920 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 10, 2018 | Dec 6, 2018 | 000-06920 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 21, 2017 | Dec 19, 2017 | 000-06920 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 18, 2017 | Dec 14, 2017 | 000-06920 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 21, 2016 | Dec 19, 2016 | 000-06920 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 5, 2016 | Dec 1, 2016 | 000-06920 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 22, 2015 | Dec 19, 2015 | 000-06920 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 9, 2015 | Dec 7, 2015 | 000-06920 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Dec 10, 2014 | Dec 8, 2014 | 000-06920 |
| 3 | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 27, 2014 | Mar 17, 2014 | 000-06920 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 11, 2014 | Mar 8, 2014 | 000-50646 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 4, 2014 | Feb 28, 2014 | 000-50646 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 25, 2014 | Feb 22, 2014 | 000-50646 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 18, 2014 | Feb 14, 2014 | 000-50646 |