| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 4 | Open Document | Open Filing | 4 | Aug 15, 2025 | Aug 13, 2025 | 000-30371 |
| 4 | Open Document | Open Filing | 4 | Apr 21, 2025 | Apr 16, 2025 | 000-30371 |
| 4 | Open Document | Open Filing | 4 | Apr 4, 2025 | Dec 28, 2022 | 000-30371 |
| SC 13D/A | Open Document | Open Filing | SC 13D/A | Jun 3, 2022 | ||
| 4 | Open Document | Open Filing | PRIMARY DOCUMENT | May 31, 2022 | Nov 15, 2021 | 000-30371 |
| SC 13D | Open Document | Open Filing | K.W. ("K.D.") DIEPHOLZ | May 8, 2015 | ||
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Apr 30, 2015 | Jan 5, 2015 | 000-30371 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Apr 30, 2015 | Aug 6, 2014 | 000-30371 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Apr 30, 2015 | Jan 8, 2014 | 000-30371 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Apr 30, 2015 | Nov 29, 2013 | 000-30371 |
| 4 | Open Document | Open Filing | OWNERSHIP DOCUMENT | Apr 30, 2015 | Apr 3, 2013 | 000-30371 |