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| 0001064728-21-000004-index.html | 2021-02-04 08:01:35 | |
| 0001064728-21-000004.txt | 2021-02-04 08:01:35 | |
 0001064728-21-000004-xbrl.zip | 35313 | 2021-02-04 08:01:35 |
| btu-20210204.htm | 35335 | 2021-02-04 08:01:35 |
| btu-20210204.xsd | 2446 | 2021-02-04 08:01:35 |
| btu-20210204_cal.xml | 731 | 2021-02-04 08:01:35 |
| btu-20210204_def.xml | 1668 | 2021-02-04 08:01:35 |
| btu-20210204_htm.xml | 11131 | 2021-02-04 08:01:35 |
| btu-20210204_lab.xml | 24275 | 2021-02-04 08:01:35 |
| btu-20210204_pre.xml | 12667 | 2021-02-04 08:01:35 |
| btu8k20210204exh991.htm | 386920 | 2021-02-04 08:01:35 |
| FilingSummary.xml | 1729 | 2021-02-04 08:01:35 |
| Financial_Report.xlsx | 5455 | 2021-02-04 08:01:35 |
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| R1.htm | 38619 | 2021-02-04 08:01:35 |
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| Show.js | 1085 | 2021-02-04 08:01:35 |