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| btu-20230213.htm | 39217 | 2023-02-14 08:00:05 |
| btu-20230213.xsd | 1933 | 2023-02-14 08:00:05 |
| btu-20230213_htm.xml | 11253 | 2023-02-14 08:00:05 |
| btu-20230213_lab.xml | 24229 | 2023-02-14 08:00:05 |
| btu-20230213_pre.xml | 12621 | 2023-02-14 08:00:05 |
| btu8k20230214ex991.htm | 461985 | 2023-02-14 08:00:05 |
| btu_20230213xex101.htm | 1550794 | 2023-02-14 08:00:05 |
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