| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 19, 2022 | Apr 15, 2022 | 001-41040 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 3, 2022 | Mar 1, 2022 | 001-41040 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 19, 2021 | Apr 15, 2021 | 000-19848 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 24, 2021 | Mar 23, 2021 | 000-19848 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 17, 2020 | Apr 15, 2020 | 000-19848 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 17, 2019 | Apr 15, 2019 | 000-19848 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 19, 2019 | Mar 15, 2019 | 000-19848 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 6, 2019 | Mar 15, 2018 | 000-19848 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Nov 27, 2018 | Nov 24, 2018 | 000-19848 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 17, 2018 | Apr 15, 2018 | 000-19848 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Nov 27, 2017 | Nov 24, 2017 | 000-19848 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 18, 2017 | Apr 15, 2017 | 000-19848 |
| 4/A | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 4, 2017 | Mar 13, 2017 | 000-19848 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Mar 15, 2017 | Mar 13, 2017 | 000-19848 |
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | Nov 28, 2016 | Nov 24, 2016 | 000-19848 |
| 3 | Open Document | Open Filing | PRIMARY DOCUMENT | Apr 20, 2016 | Apr 14, 2016 | 000-19848 |