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| 0001064728-23-000004-index.html | 2023-02-06 16:52:38 | |
| 0001064728-23-000004.txt | 2023-02-06 16:52:38 | |
 0001064728-23-000004-xbrl.zip | 23769 | 2023-02-06 16:52:38 |
| btu-20230203.htm | 36573 | 2023-02-06 16:52:38 |
| btu-20230203.xsd | 1927 | 2023-02-06 16:52:38 |
| btu-20230203_htm.xml | 11251 | 2023-02-06 16:52:38 |
| btu-20230203_lab.xml | 24137 | 2023-02-06 16:52:38 |
| btu-20230203_pre.xml | 12529 | 2023-02-06 16:52:38 |
| btu8k20230203_ex101.htm | 108559 | 2023-02-06 16:52:38 |
| FilingSummary.xml | 1659 | 2023-02-06 16:52:38 |
| Financial_Report.xlsx | 5699 | 2023-02-06 16:52:38 |
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| R1.htm | 38104 | 2023-02-06 16:52:38 |
| report.css | 2767 | 2023-02-06 16:52:38 |
| Show.js | 1084 | 2023-02-06 16:52:38 |