| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 3, 2022 | Mar 2, 2022 | 000-16577 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Nov 10, 2021 | Nov 10, 2021 | 000-16577 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Aug 16, 2021 | Aug 13, 2021 | 000-16577 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 17, 2021 | May 13, 2021 | 000-16577 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 3, 2021 | Mar 2, 2021 | 000-16577 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 14, 2020 | May 14, 2020 | 000-16577 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 20, 2019 | May 16, 2019 | 000-16577 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 11, 2018 | May 10, 2018 | 000-16577 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 12, 2017 | May 11, 2017 | 000-16577 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 21, 2017 | Mar 20, 2017 | 000-16577 |
| 5/A | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 14, 2017 | Dec 31, 2016 | 000-16577 |
| 5 | Open Document | Open Filing | PRIMARY DOCUMENT | Feb 10, 2017 | Dec 31, 2016 | 000-16577 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 23, 2016 | May 20, 2016 | 000-16577 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 16, 2016 | May 12, 2016 | 000-16577 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 18, 2015 | May 18, 2015 | 000-16577 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 19, 2014 | May 19, 2014 | 000-16577 |
| 4/A | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 6, 2014 | May 17, 2013 | 000-16577 |