Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001064728-20-000020-index-headers.html | 2020-08-05 08:06:01 | |
| 0001064728-20-000020-index.html | 2020-08-05 08:06:01 | |
| 0001064728-20-000020.txt | 2020-08-05 08:06:01 | |
 0001064728-20-000020-xbrl.zip | 40394 | 2020-08-05 08:06:01 |
| btu-20200805.htm | 51885 | 2020-08-05 08:06:01 |
| btu-20200805.xsd | 2446 | 2020-08-05 08:06:01 |
| btu-20200805_cal.xml | 731 | 2020-08-05 08:06:01 |
| btu-20200805_def.xml | 1668 | 2020-08-05 08:06:01 |
| btu-20200805_htm.xml | 11112 | 2020-08-05 08:06:01 |
| btu-20200805_lab.xml | 24275 | 2020-08-05 08:06:01 |
| btu-20200805_pre.xml | 12667 | 2020-08-05 08:06:01 |
| btu8k20200805ex991.htm | 759507 | 2020-08-05 08:06:01 |
| FilingSummary.xml | 1728 | 2020-08-05 08:06:01 |
| Financial_Report.xlsx | 5454 | 2020-08-05 08:06:01 |
 image71.jpg | 195073 | 2020-08-05 08:06:01 |
| MetaLinks.json | 17467 | 2020-08-05 08:06:01 |
| R1.htm | 38619 | 2020-08-05 08:06:01 |
| report.css | 2767 | 2020-08-05 08:06:01 |
| Show.js | 1085 | 2020-08-05 08:06:01 |