| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 6-K | Open Document | Open Filing | Jun 27, 2025 | Jun 26, 2025 | 000-16353 | |
| 15F-12G | Open Document | Open Filing | Jun 26, 2025 | 000-16353 | ||
| 6-K | Open Document | Data | Open Filing | 6-K | Jun 10, 2025 | Mar 31, 2025 | 000-16353 |
| 20-F | Open Document | Data | Open Filing | 20-F | May 15, 2025 | Dec 31, 2024 | 000-16353 |
| 6-K | Open Document | Data | Open Filing | 6-K | May 5, 2025 | Dec 31, 2024 | 000-16353 |
| NT 20-F | Open Document | Open Filing | NT 20-F | May 1, 2025 | Dec 31, 2024 | 000-16353 |
| UPLOAD | Open Document | Open Filing | Jan 13, 2025 | 000-16353 | ||
| 20-F/A | Open Document | Open Filing | 20-F/A | Jan 13, 2025 | Dec 31, 2023 | 000-16353 |
| 6-K | Open Document | Open Filing | 6-K | Jan 2, 2025 | Dec 31, 2024 | 000-16353 |
| CORRESP | Open Document | Open Filing | Dec 19, 2024 | |||
| UPLOAD | Open Document | Open Filing | Dec 6, 2024 | 000-16353 | ||
| 6-K | Open Document | Data | Open Filing | 6-K | Nov 29, 2024 | Sep 30, 2024 | 000-16353 |
| 6-K | Open Document | Data | Open Filing | 6-K | Nov 29, 2024 | Sep 30, 2024 | 000-16353 |
| D | Open Document | Open Filing | Nov 14, 2024 | 021-529428 | ||
| 6-K | Open Document | Open Filing | 6-K | Nov 4, 2024 | Nov 1, 2024 | 000-16353 |
| 6-K | Open Document | Data | Open Filing | 6-K | Oct 1, 2024 | Jun 30, 2024 | 000-16353 |
| 6-K | Open Document | Open Filing | 6-K | Jun 3, 2024 | Jun 3, 2024 | 000-16353 |
| 20-F | Open Document | Data | Open Filing | 20-F | May 14, 2024 | Dec 31, 2023 | 000-16353 |
| 6-K | Open Document | Open Filing | 6-K | May 3, 2024 | May 3, 2024 | 000-16353 |
| NT 20-F | Open Document | Open Filing | NT 20-F | Apr 29, 2024 | Dec 31, 2023 | 000-16353 |
| 6-K | Open Document | Open Filing | 6-K | Mar 5, 2024 | Mar 5, 2024 | 000-16353 |
| 6-K | Open Document | Open Filing | 6-K | Nov 28, 2023 | Nov 28, 2023 | 000-16353 |
| 6-K | Open Document | Open Filing | 6-K | Aug 30, 2023 | Aug 30, 2023 | 000-16353 |
| 6-K | Open Document | Open Filing | 6-K | Aug 4, 2023 | Aug 3, 2023 | 000-16353 |
| 6-K | Open Document | Open Filing | 6-K | Jun 1, 2023 | Jun 1, 2023 | 000-16353 |
| 20-F | Open Document | Data | Open Filing | 20-F | May 15, 2023 | Dec 31, 2022 | 000-16353 |
| 6-K | Open Document | Open Filing | 6-K | May 5, 2023 | Dec 31, 2022 | 000-16353 |
| NT 20-F | Open Document | Open Filing | NT 20-F | May 1, 2023 | Dec 31, 2022 | 000-16353 |
| 6-K | Open Document | Open Filing | 6-K | Nov 17, 2022 | Nov 17, 2022 | 000-16353 |
| 6-K | Open Document | Open Filing | 6-K | Oct 25, 2022 | Oct 14, 2022 | 000-16353 |
| 6-K | Open Document | Open Filing | 6-K | Aug 19, 2022 | Aug 17, 2022 | 000-16353 |
| 6-K | Open Document | Open Filing | 6-K | May 31, 2022 | May 27, 2022 | 000-16353 |
| 20-F | Open Document | Data | Open Filing | 20-F | May 16, 2022 | Dec 31, 2021 | 000-16353 |
| 6-K | Open Document | Open Filing | 6-K | May 5, 2022 | May 5, 2022 | 000-16353 |
| NT 20-F | Open Document | Open Filing | NT 20-F | May 2, 2022 | Dec 31, 2021 | 000-16353 |
| 6-K | Open Document | Open Filing | 6-K | Dec 6, 2021 | Jun 6, 2021 | 000-16353 |
| 6-K | Open Document | Open Filing | 6-K | Nov 10, 2021 | Nov 10, 2021 | 000-16353 |
| 6-K | Open Document | Open Filing | 6-K | Oct 29, 2021 | Oct 29, 2021 | 000-16353 |
| 6-K | Open Document | Open Filing | 6-K | Aug 24, 2021 | Jun 30, 2021 | 000-16353 |
| 6-K | Open Document | Open Filing | 6-K | Jun 23, 2021 | Jun 23, 2021 | 000-16353 |
| 6-K | Open Document | Open Filing | 6-K | Jun 1, 2021 | Jun 1, 2021 | 000-16353 |
| 20-F | Open Document | Data | Open Filing | 20-F | May 14, 2021 | Dec 31, 2020 | 000-16353 |
| 6-K | Open Document | Open Filing | 6-K | May 3, 2021 | Apr 30, 2021 | 000-16353 |
| NT 20-F | Open Document | Open Filing | NT 20-F | Apr 30, 2021 | Dec 31, 2020 | 000-16353 |
| 6-K | Open Document | Open Filing | 6-K | Feb 10, 2021 | Feb 9, 2021 | 000-16353 |
| 6-K | Open Document | Open Filing | 6-K | Nov 17, 2020 | Nov 16, 2020 | 000-16353 |
| 6-K | Open Document | Open Filing | 6-K | Nov 2, 2020 | Oct 30, 2020 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | Aug 18, 2020 | Aug 17, 2020 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | Jul 13, 2020 | Jul 13, 2020 | 000-16353 |
| 20-F | Open Document | Data | Open Filing | FORM 20-F | Jun 5, 2020 | Dec 31, 2019 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | Jun 4, 2020 | Jun 4, 2020 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | Jun 1, 2020 | May 29, 2020 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | Apr 28, 2020 | Apr 27, 2020 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | Jan 8, 2020 | Dec 31, 2019 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | Nov 8, 2019 | Aug 31, 2019 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | Oct 17, 2019 | Oct 16, 2019 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | Oct 7, 2019 | Oct 7, 2019 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | Aug 27, 2019 | Aug 26, 2019 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | Jul 31, 2019 | Jul 30, 2019 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | Jun 21, 2019 | Jun 20, 2019 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | May 22, 2019 | May 22, 2019 | 000-16353 |
| 20-F | Open Document | Data | Open Filing | FORM 20-F | Apr 24, 2019 | Dec 31, 2018 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | Apr 18, 2019 | Apr 18, 2019 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | Mar 22, 2019 | Mar 22, 2019 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | Jan 18, 2019 | Jan 18, 2019 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | Nov 15, 2018 | Nov 15, 2018 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | Nov 1, 2018 | Oct 31, 2018 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | Aug 15, 2018 | Aug 14, 2018 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | May 25, 2018 | May 31, 2018 | 000-16353 |
| 20-F/A | Open Document | Data | Open Filing | FORM 20-F/A | May 15, 2018 | Dec 31, 2017 | 000-16353 |
| 20-F | Open Document | Open Filing | FORM 20-F | May 11, 2018 | Dec 31, 2017 | 000-16353 |
| NT 20-F | Open Document | Open Filing | NT 20-F | Apr 30, 2018 | Dec 31, 2017 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | Apr 25, 2018 | Apr 30, 2018 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | Feb 12, 2018 | Feb 9, 2018 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | Nov 14, 2017 | Nov 14, 2017 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | Oct 31, 2017 | Oct 31, 2017 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | Aug 8, 2017 | Aug 8, 2017 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | May 31, 2017 | May 31, 2017 | 000-16353 |
| 20-F | Open Document | Open Filing | FORM 20-F | May 12, 2017 | Dec 31, 2016 | 000-16353 |
| NT 20-F | Open Document | Open Filing | NT 20-F | May 2, 2017 | Dec 31, 2016 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | May 1, 2017 | Apr 28, 2017 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | Mar 30, 2017 | Mar 29, 2017 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | Feb 16, 2017 | Feb 16, 2017 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | Nov 25, 2016 | Nov 23, 2016 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | Aug 25, 2016 | Aug 25, 2016 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | Aug 11, 2016 | Aug 10, 2016 | 000-16353 |
| 6-K | Open Document | Data | Open Filing | FORM 6-K | May 31, 2016 | May 31, 2016 | 000-16353 |
| 20-F | Open Document | Data | Open Filing | FORM 20-F | May 2, 2016 | Dec 31, 2015 | 000-16353 |
| 6-K | Open Document | Data | Open Filing | FORM 6-K | Apr 29, 2016 | Apr 28, 2016 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | Feb 17, 2016 | Feb 17, 2016 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | Feb 12, 2016 | Feb 12, 2016 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | Feb 4, 2016 | Feb 4, 2016 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | Nov 10, 2015 | Nov 9, 2015 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | Aug 25, 2015 | Aug 24, 2015 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | Jun 16, 2015 | Jun 15, 2015 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | May 26, 2015 | May 25, 2015 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | May 12, 2015 | May 12, 2015 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | May 5, 2015 | May 5, 2015 | 000-16353 |
| 20-F | Open Document | Open Filing | FORM 20-F | Apr 29, 2015 | Dec 31, 2014 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | Apr 29, 2015 | Apr 30, 2015 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | Feb 2, 2015 | Jan 31, 2015 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | Dec 3, 2014 | Sep 30, 2014 | 000-16353 |
| 6-K | Open Document | Open Filing | 9/30/14 FORM 6-K | Oct 2, 2014 | Sep 30, 2014 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | Sep 2, 2014 | Aug 29, 2014 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | Jul 31, 2014 | Jul 31, 2014 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | Jun 30, 2014 | Jun 30, 2014 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | May 27, 2014 | May 27, 2014 | 000-16353 |
| 20-F | Open Document | Open Filing | FORM 20-F | May 9, 2014 | Dec 31, 2013 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | May 5, 2014 | Apr 30, 2014 | 000-16353 |
| NT 20-F | Open Document | Open Filing | FORM NT 20-F | Apr 30, 2014 | Dec 31, 2013 | 000-16353 |