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| 0001064728-23-000141-index.html | 2023-10-26 08:00:27 | |
| 0001064728-23-000141.txt | 2023-10-26 08:00:27 | |
 0001064728-23-000141-xbrl.zip | 36493 | 2023-10-26 08:00:27 |
| btu-20231026.htm | 30992 | 2023-10-26 08:00:27 |
| btu-20231026.xsd | 1929 | 2023-10-26 08:00:27 |
| btu-20231026_htm.xml | 2720 | 2023-10-26 08:00:27 |
| btu-20231026_lab.xml | 24139 | 2023-10-26 08:00:27 |
| btu-20231026_pre.xml | 12531 | 2023-10-26 08:00:27 |
| btu8k20231026ex991.htm | 484776 | 2023-10-26 08:00:27 |
| btu8k20231026ex992.htm | 6664 | 2023-10-26 08:00:27 |
| FilingSummary.xml | 1635 | 2023-10-26 08:00:27 |
| Financial_Report.xlsx | 5696 | 2023-10-26 08:00:27 |
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| R1.htm | 38095 | 2023-10-26 08:00:27 |
| report.css | 2767 | 2023-10-26 08:00:27 |
| Show.js | 1085 | 2023-10-26 08:00:27 |