| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) | 
|---|---|---|---|---|---|---|
| 3 | Open Document | Open Filing | Jun 14, 2023 | Feb 23, 2023 | 811-23808 | |
| 4 | Open Document | Open Filing | Jul 7, 2021 | Jul 3, 2021 | 000-31981 | |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Feb 2, 2018 | Jan 31, 2018 | 000-31981 | 
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Apr 17, 2017 | Nov 8, 2016 | 000-31981 | 
| 4 | Open Document | Open Filing | Apr 15, 2014 | Feb 1, 2013 | 000-31981 |