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| 0001064728-23-000031-index.html | 2023-03-30 16:40:07 | |
| 0001064728-23-000031.txt | 2023-03-30 16:40:07 | |
 0001064728-23-000031-xbrl.zip | 12103 | 2023-03-30 16:40:07 |
| btu-20230330.htm | 29435 | 2023-03-30 16:40:07 |
| btu-20230330.xsd | 1927 | 2023-03-30 16:40:07 |
| btu-20230330_htm.xml | 4111 | 2023-03-30 16:40:07 |
| btu-20230330_lab.xml | 24137 | 2023-03-30 16:40:07 |
| btu-20230330_pre.xml | 12529 | 2023-03-30 16:40:07 |
| btu8k20230330_ex991.htm | 11074 | 2023-03-30 16:40:07 |
| FilingSummary.xml | 1659 | 2023-03-30 16:40:07 |
| Financial_Report.xlsx | 5695 | 2023-03-30 16:40:07 |
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| Show.js | 1085 | 2023-03-30 16:40:07 |