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| 0001064728-23-000027-index.html | 2023-03-29 16:43:21 | |
| 0001064728-23-000027.txt | 2023-03-29 16:43:21 | |
 0001064728-23-000027-xbrl.zip | 12141 | 2023-03-29 16:43:21 |
| btu-20230329.htm | 29631 | 2023-03-29 16:43:21 |
| btu-20230329.xsd | 1927 | 2023-03-29 16:43:21 |
| btu-20230329_htm.xml | 4111 | 2023-03-29 16:43:21 |
| btu-20230329_lab.xml | 24137 | 2023-03-29 16:43:21 |
| btu-20230329_pre.xml | 12529 | 2023-03-29 16:43:21 |
| btu8k20230329_ex991.htm | 7447 | 2023-03-29 16:43:21 |
| FilingSummary.xml | 1659 | 2023-03-29 16:43:21 |
| Financial_Report.xlsx | 5698 | 2023-03-29 16:43:21 |
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| report.css | 2767 | 2023-03-29 16:43:21 |
| Show.js | 1085 | 2023-03-29 16:43:21 |