| Form type | Document | Filing | Description | Filing date | Reporting date | File number(s) |
|---|---|---|---|---|---|---|
| 6-K | Open Document | Open Filing | 27 Jun 2025 | 26 Jun 2025 | 000-16353 | |
| 15F-12G | Open Document | Open Filing | 26 Jun 2025 | 000-16353 | ||
| 6-K | Open Document | Data | Open Filing | 6-K | 10 Jun 2025 | 31 Mar 2025 | 000-16353 |
| 20-F | Open Document | Data | Open Filing | 20-F | 15 May 2025 | 31 Dec 2024 | 000-16353 |
| 6-K | Open Document | Data | Open Filing | 6-K | 05 May 2025 | 31 Dec 2024 | 000-16353 |
| NT 20-F | Open Document | Open Filing | NT 20-F | 01 May 2025 | 31 Dec 2024 | 000-16353 |
| UPLOAD | Open Document | Open Filing | 13 Jan 2025 | 000-16353 | ||
| 20-F/A | Open Document | Open Filing | 20-F/A | 13 Jan 2025 | 31 Dec 2023 | 000-16353 |
| 6-K | Open Document | Open Filing | 6-K | 02 Jan 2025 | 31 Dec 2024 | 000-16353 |
| CORRESP | Open Document | Open Filing | 19 Dec 2024 | |||
| UPLOAD | Open Document | Open Filing | 06 Dec 2024 | 000-16353 | ||
| 6-K | Open Document | Data | Open Filing | 6-K | 29 Nov 2024 | 30 Sep 2024 | 000-16353 |
| 6-K | Open Document | Data | Open Filing | 6-K | 29 Nov 2024 | 30 Sep 2024 | 000-16353 |
| D | Open Document | Open Filing | 14 Nov 2024 | 021-529428 | ||
| 6-K | Open Document | Open Filing | 6-K | 04 Nov 2024 | 01 Nov 2024 | 000-16353 |
| 6-K | Open Document | Data | Open Filing | 6-K | 01 Oct 2024 | 30 Jun 2024 | 000-16353 |
| 6-K | Open Document | Open Filing | 6-K | 03 Jun 2024 | 03 Jun 2024 | 000-16353 |
| 20-F | Open Document | Data | Open Filing | 20-F | 14 May 2024 | 31 Dec 2023 | 000-16353 |
| 6-K | Open Document | Open Filing | 6-K | 03 May 2024 | 03 May 2024 | 000-16353 |
| NT 20-F | Open Document | Open Filing | NT 20-F | 29 Apr 2024 | 31 Dec 2023 | 000-16353 |
| 6-K | Open Document | Open Filing | 6-K | 05 Mar 2024 | 05 Mar 2024 | 000-16353 |
| 6-K | Open Document | Open Filing | 6-K | 28 Nov 2023 | 28 Nov 2023 | 000-16353 |
| 6-K | Open Document | Open Filing | 6-K | 30 Aug 2023 | 30 Aug 2023 | 000-16353 |
| 6-K | Open Document | Open Filing | 6-K | 04 Aug 2023 | 03 Aug 2023 | 000-16353 |
| 6-K | Open Document | Open Filing | 6-K | 01 Jun 2023 | 01 Jun 2023 | 000-16353 |
| 20-F | Open Document | Data | Open Filing | 20-F | 15 May 2023 | 31 Dec 2022 | 000-16353 |
| 6-K | Open Document | Open Filing | 6-K | 05 May 2023 | 31 Dec 2022 | 000-16353 |
| NT 20-F | Open Document | Open Filing | NT 20-F | 01 May 2023 | 31 Dec 2022 | 000-16353 |
| 6-K | Open Document | Open Filing | 6-K | 17 Nov 2022 | 17 Nov 2022 | 000-16353 |
| 6-K | Open Document | Open Filing | 6-K | 25 Oct 2022 | 14 Oct 2022 | 000-16353 |
| 6-K | Open Document | Open Filing | 6-K | 19 Aug 2022 | 17 Aug 2022 | 000-16353 |
| 6-K | Open Document | Open Filing | 6-K | 31 May 2022 | 27 May 2022 | 000-16353 |
| 20-F | Open Document | Data | Open Filing | 20-F | 16 May 2022 | 31 Dec 2021 | 000-16353 |
| 6-K | Open Document | Open Filing | 6-K | 05 May 2022 | 05 May 2022 | 000-16353 |
| NT 20-F | Open Document | Open Filing | NT 20-F | 02 May 2022 | 31 Dec 2021 | 000-16353 |
| 6-K | Open Document | Open Filing | 6-K | 06 Dec 2021 | 06 Jun 2021 | 000-16353 |
| 6-K | Open Document | Open Filing | 6-K | 10 Nov 2021 | 10 Nov 2021 | 000-16353 |
| 6-K | Open Document | Open Filing | 6-K | 29 Oct 2021 | 29 Oct 2021 | 000-16353 |
| 6-K | Open Document | Open Filing | 6-K | 24 Aug 2021 | 30 Jun 2021 | 000-16353 |
| 6-K | Open Document | Open Filing | 6-K | 23 Jun 2021 | 23 Jun 2021 | 000-16353 |
| 6-K | Open Document | Open Filing | 6-K | 01 Jun 2021 | 01 Jun 2021 | 000-16353 |
| 20-F | Open Document | Data | Open Filing | 20-F | 14 May 2021 | 31 Dec 2020 | 000-16353 |
| 6-K | Open Document | Open Filing | 6-K | 03 May 2021 | 30 Apr 2021 | 000-16353 |
| NT 20-F | Open Document | Open Filing | NT 20-F | 30 Apr 2021 | 31 Dec 2020 | 000-16353 |
| 6-K | Open Document | Open Filing | 6-K | 10 Feb 2021 | 09 Feb 2021 | 000-16353 |
| 6-K | Open Document | Open Filing | 6-K | 17 Nov 2020 | 16 Nov 2020 | 000-16353 |
| 6-K | Open Document | Open Filing | 6-K | 02 Nov 2020 | 30 Oct 2020 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | 18 Aug 2020 | 17 Aug 2020 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | 13 Jul 2020 | 13 Jul 2020 | 000-16353 |
| 20-F | Open Document | Data | Open Filing | FORM 20-F | 05 Jun 2020 | 31 Dec 2019 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | 04 Jun 2020 | 04 Jun 2020 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | 01 Jun 2020 | 29 May 2020 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | 28 Apr 2020 | 27 Apr 2020 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | 08 Jan 2020 | 31 Dec 2019 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | 08 Nov 2019 | 31 Aug 2019 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | 17 Oct 2019 | 16 Oct 2019 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | 07 Oct 2019 | 07 Oct 2019 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | 27 Aug 2019 | 26 Aug 2019 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | 31 Jul 2019 | 30 Jul 2019 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | 21 Jun 2019 | 20 Jun 2019 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | 22 May 2019 | 22 May 2019 | 000-16353 |
| 20-F | Open Document | Data | Open Filing | FORM 20-F | 24 Apr 2019 | 31 Dec 2018 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | 18 Apr 2019 | 18 Apr 2019 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | 22 Mar 2019 | 22 Mar 2019 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | 18 Jan 2019 | 18 Jan 2019 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | 15 Nov 2018 | 15 Nov 2018 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | 01 Nov 2018 | 31 Oct 2018 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | 15 Aug 2018 | 14 Aug 2018 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | 25 May 2018 | 31 May 2018 | 000-16353 |
| 20-F/A | Open Document | Data | Open Filing | FORM 20-F/A | 15 May 2018 | 31 Dec 2017 | 000-16353 |
| 20-F | Open Document | Open Filing | FORM 20-F | 11 May 2018 | 31 Dec 2017 | 000-16353 |
| NT 20-F | Open Document | Open Filing | NT 20-F | 30 Apr 2018 | 31 Dec 2017 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | 25 Apr 2018 | 30 Apr 2018 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | 12 Feb 2018 | 09 Feb 2018 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | 14 Nov 2017 | 14 Nov 2017 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | 31 Oct 2017 | 31 Oct 2017 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | 08 Aug 2017 | 08 Aug 2017 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | 31 May 2017 | 31 May 2017 | 000-16353 |
| 20-F | Open Document | Open Filing | FORM 20-F | 12 May 2017 | 31 Dec 2016 | 000-16353 |
| NT 20-F | Open Document | Open Filing | NT 20-F | 02 May 2017 | 31 Dec 2016 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | 01 May 2017 | 28 Apr 2017 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | 30 Mar 2017 | 29 Mar 2017 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | 16 Feb 2017 | 16 Feb 2017 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | 25 Nov 2016 | 23 Nov 2016 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | 25 Aug 2016 | 25 Aug 2016 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | 11 Aug 2016 | 10 Aug 2016 | 000-16353 |
| 6-K | Open Document | Data | Open Filing | FORM 6-K | 31 May 2016 | 31 May 2016 | 000-16353 |
| 20-F | Open Document | Data | Open Filing | FORM 20-F | 02 May 2016 | 31 Dec 2015 | 000-16353 |
| 6-K | Open Document | Data | Open Filing | FORM 6-K | 29 Apr 2016 | 28 Apr 2016 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | 17 Feb 2016 | 17 Feb 2016 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | 12 Feb 2016 | 12 Feb 2016 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | 04 Feb 2016 | 04 Feb 2016 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | 10 Nov 2015 | 09 Nov 2015 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | 25 Aug 2015 | 24 Aug 2015 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | 16 Jun 2015 | 15 Jun 2015 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | 26 May 2015 | 25 May 2015 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | 12 May 2015 | 12 May 2015 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | 05 May 2015 | 05 May 2015 | 000-16353 |
| 20-F | Open Document | Open Filing | FORM 20-F | 29 Apr 2015 | 31 Dec 2014 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | 29 Apr 2015 | 30 Apr 2015 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | 02 Feb 2015 | 31 Jan 2015 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | 03 Dec 2014 | 30 Sep 2014 | 000-16353 |
| 6-K | Open Document | Open Filing | 9/30/14 FORM 6-K | 02 Oct 2014 | 30 Sep 2014 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | 02 Sep 2014 | 29 Aug 2014 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | 31 Jul 2014 | 31 Jul 2014 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | 30 Jun 2014 | 30 Jun 2014 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | 27 May 2014 | 27 May 2014 | 000-16353 |
| 20-F | Open Document | Open Filing | FORM 20-F | 09 May 2014 | 31 Dec 2013 | 000-16353 |
| 6-K | Open Document | Open Filing | FORM 6-K | 05 May 2014 | 30 Apr 2014 | 000-16353 |
| NT 20-F | Open Document | Open Filing | FORM NT 20-F | 30 Apr 2014 | 31 Dec 2013 | 000-16353 |