Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001104659-23-002700-index-headers.html | 2023-01-10 16:04:39 | |
| 0001104659-23-002700-index.html | 2023-01-10 16:04:39 | |
| 0001104659-23-002700.txt | 2023-01-10 16:04:39 | |
 0001104659-23-002700-xbrl.zip | 645929 | 2023-01-10 16:04:39 |
| FilingSummary.xml | 42069 | 2023-01-10 16:04:39 |
| Financial_Report.xlsx | 90247 | 2023-01-10 16:04:39 |
| MetaLinks.json | 722482 | 2023-01-10 16:04:39 |
| metc-20211231.xsd | 55776 | 2023-01-10 16:04:39 |
| metc-20211231x10ka.htm | 1931119 | 2023-01-10 16:04:39 |
 metc-20211231x10ka006.jpg | 32558 | 2023-01-10 16:04:39 |
 metc-20211231x10ka007.jpg | 32601 | 2023-01-10 16:04:39 |
| metc-20211231x10ka_htm.xml | 1157004 | 2023-01-10 16:04:39 |
| metc-20211231xex23d1.htm | 2966 | 2023-01-10 16:04:39 |
| metc-20211231xex23d2.htm | 11419 | 2023-01-10 16:04:39 |
 metc-20211231xex23d2001.jpg | 10608 | 2023-01-10 16:04:39 |
| metc-20211231xex23d4.htm | 3470 | 2023-01-10 16:04:39 |
| metc-20211231xex31d1.htm | 12184 | 2023-01-10 16:04:39 |
| metc-20211231xex31d2.htm | 12172 | 2023-01-10 16:04:39 |
| metc-20211231xex32d1.htm | 5907 | 2023-01-10 16:04:39 |
| metc-20211231xex32d2.htm | 5870 | 2023-01-10 16:04:39 |
| metc-20211231xex96d1.htm | 3338122 | 2023-01-10 16:04:39 |
 metc-20211231xex96d1001.jpg | 3600 | 2023-01-10 16:04:39 |
 metc-20211231xex96d1003.jpg | 163502 | 2023-01-10 16:04:39 |
 metc-20211231xex96d1004.jpg | 62694 | 2023-01-10 16:04:39 |
 metc-20211231xex96d1005.jpg | 99126 | 2023-01-10 16:04:39 |
 metc-20211231xex96d1006.jpg | 213203 | 2023-01-10 16:04:39 |
 metc-20211231xex96d1007.jpg | 34970 | 2023-01-10 16:04:39 |
 metc-20211231xex96d1008.jpg | 18987 | 2023-01-10 16:04:39 |
 metc-20211231xex96d1014.jpg | 194452 | 2023-01-10 16:04:39 |
 metc-20211231xex96d1015.jpg | 240491 | 2023-01-10 16:04:39 |
 metc-20211231xex96d1016.jpg | 149472 | 2023-01-10 16:04:39 |
 metc-20211231xex96d1017.jpg | 64049 | 2023-01-10 16:04:39 |
 metc-20211231xex96d1018.jpg | 175237 | 2023-01-10 16:04:39 |
 metc-20211231xex96d1019.jpg | 31732 | 2023-01-10 16:04:39 |
 metc-20211231xex96d1020.jpg | 30198 | 2023-01-10 16:04:39 |
 metc-20211231xex96d1021.jpg | 28318 | 2023-01-10 16:04:39 |
 metc-20211231xex96d1022.jpg | 41059 | 2023-01-10 16:04:39 |
 metc-20211231xex96d1023.jpg | 27006 | 2023-01-10 16:04:39 |
 metc-20211231xex96d1024.jpg | 22020 | 2023-01-10 16:04:39 |
 metc-20211231xex96d1025.jpg | 29118 | 2023-01-10 16:04:39 |
 metc-20211231xex96d1026.jpg | 70136 | 2023-01-10 16:04:39 |
| metc-20211231xex96d2.htm | 4308035 | 2023-01-10 16:04:39 |
 metc-20211231xex96d2001.jpg | 3176 | 2023-01-10 16:04:39 |
 metc-20211231xex96d2003.jpg | 167034 | 2023-01-10 16:04:39 |
 metc-20211231xex96d2004.jpg | 73164 | 2023-01-10 16:04:39 |
 metc-20211231xex96d2005.jpg | 187155 | 2023-01-10 16:04:39 |
 metc-20211231xex96d2006.jpg | 26118 | 2023-01-10 16:04:39 |
 metc-20211231xex96d2007.jpg | 20208 | 2023-01-10 16:04:39 |
 metc-20211231xex96d2008.jpg | 173152 | 2023-01-10 16:04:39 |
 metc-20211231xex96d2009.jpg | 148443 | 2023-01-10 16:04:39 |
 metc-20211231xex96d2010.jpg | 177227 | 2023-01-10 16:04:39 |
 metc-20211231xex96d2011.jpg | 149052 | 2023-01-10 16:04:39 |
 metc-20211231xex96d2012.jpg | 162618 | 2023-01-10 16:04:39 |
 metc-20211231xex96d2013.jpg | 174389 | 2023-01-10 16:04:39 |
 metc-20211231xex96d2014.jpg | 192857 | 2023-01-10 16:04:39 |
 metc-20211231xex96d2015.jpg | 180999 | 2023-01-10 16:04:39 |
 metc-20211231xex96d2016.jpg | 165471 | 2023-01-10 16:04:39 |
 metc-20211231xex96d2017.jpg | 52517 | 2023-01-10 16:04:39 |
 metc-20211231xex96d2018.jpg | 177179 | 2023-01-10 16:04:39 |
 metc-20211231xex96d2019.jpg | 32432 | 2023-01-10 16:04:39 |
 metc-20211231xex96d2020.jpg | 27463 | 2023-01-10 16:04:39 |
 metc-20211231xex96d2021.jpg | 16759 | 2023-01-10 16:04:39 |
 metc-20211231xex96d2022.jpg | 38863 | 2023-01-10 16:04:39 |
 metc-20211231xex96d2023.jpg | 30333 | 2023-01-10 16:04:39 |
 metc-20211231xex96d2024.jpg | 26517 | 2023-01-10 16:04:39 |
 metc-20211231xex96d2025.jpg | 32090 | 2023-01-10 16:04:39 |
 metc-20211231xex96d2026.jpg | 87569 | 2023-01-10 16:04:39 |
| metc-20211231_cal.xml | 66129 | 2023-01-10 16:04:39 |
| metc-20211231_def.xml | 220389 | 2023-01-10 16:04:39 |
| metc-20211231_lab.xml | 488310 | 2023-01-10 16:04:39 |
| metc-20211231_pre.xml | 378992 | 2023-01-10 16:04:39 |
| R1.htm | 72166 | 2023-01-10 16:04:39 |
| R10.htm | 43005 | 2023-01-10 16:04:39 |
| R11.htm | 48122 | 2023-01-10 16:04:39 |
| R12.htm | 20819 | 2023-01-10 16:04:39 |
| R13.htm | 5952 | 2023-01-10 16:04:39 |
| R14.htm | 44026 | 2023-01-10 16:04:39 |
| R15.htm | 88991 | 2023-01-10 16:04:39 |
| R16.htm | 28852 | 2023-01-10 16:04:39 |
| R17.htm | 9981 | 2023-01-10 16:04:39 |
| R18.htm | 25434 | 2023-01-10 16:04:39 |
| R19.htm | 7294 | 2023-01-10 16:04:39 |
| R2.htm | 104707 | 2023-01-10 16:04:39 |
| R20.htm | 92541 | 2023-01-10 16:04:39 |
| R21.htm | 38364 | 2023-01-10 16:04:39 |
| R22.htm | 8642 | 2023-01-10 16:04:39 |
| R23.htm | 72466 | 2023-01-10 16:04:39 |
| R24.htm | 41582 | 2023-01-10 16:04:39 |
| R25.htm | 45065 | 2023-01-10 16:04:39 |
| R26.htm | 19424 | 2023-01-10 16:04:39 |
| R27.htm | 37354 | 2023-01-10 16:04:39 |
| R28.htm | 53301 | 2023-01-10 16:04:39 |
| R29.htm | 23804 | 2023-01-10 16:04:39 |
| R3.htm | 19490 | 2023-01-10 16:04:39 |
| R30.htm | 21340 | 2023-01-10 16:04:39 |
| R31.htm | 93361 | 2023-01-10 16:04:39 |
| R32.htm | 37104 | 2023-01-10 16:04:39 |
| R33.htm | 17335 | 2023-01-10 16:04:39 |
| R34.htm | 10368 | 2023-01-10 16:04:39 |
| R35.htm | 7520 | 2023-01-10 16:04:39 |
| R36.htm | 4634 | 2023-01-10 16:04:39 |
| R37.htm | 21469 | 2023-01-10 16:04:39 |
| R38.htm | 7109 | 2023-01-10 16:04:39 |
| R39.htm | 4683 | 2023-01-10 16:04:39 |
| R4.htm | 70744 | 2023-01-10 16:04:39 |
| R40.htm | 21769 | 2023-01-10 16:04:39 |
| R41.htm | 12023 | 2023-01-10 16:04:39 |
| R42.htm | 6486 | 2023-01-10 16:04:39 |
| R43.htm | 26280 | 2023-01-10 16:04:39 |
| R44.htm | 5371 | 2023-01-10 16:04:39 |
| R45.htm | 13545 | 2023-01-10 16:04:39 |
| R46.htm | 7634 | 2023-01-10 16:04:39 |
| R47.htm | 107083 | 2023-01-10 16:04:39 |
| R48.htm | 13945 | 2023-01-10 16:04:39 |
| R49.htm | 16978 | 2023-01-10 16:04:39 |
| R5.htm | 28388 | 2023-01-10 16:04:39 |
| R50.htm | 39422 | 2023-01-10 16:04:39 |
| R51.htm | 46015 | 2023-01-10 16:04:39 |
| R52.htm | 18649 | 2023-01-10 16:04:39 |
| R53.htm | 65671 | 2023-01-10 16:04:39 |
| R54.htm | 24143 | 2023-01-10 16:04:39 |
| R55.htm | 24659 | 2023-01-10 16:04:39 |
| R56.htm | 11019 | 2023-01-10 16:04:39 |
| R57.htm | 12209 | 2023-01-10 16:04:39 |
| R58.htm | 14943 | 2023-01-10 16:04:39 |
| R59.htm | 22794 | 2023-01-10 16:04:39 |
| R6.htm | 4311 | 2023-01-10 16:04:39 |
| R60.htm | 21704 | 2023-01-10 16:04:39 |
| R61.htm | 19020 | 2023-01-10 16:04:39 |
| R62.htm | 9708 | 2023-01-10 16:04:39 |
| R63.htm | 38399 | 2023-01-10 16:04:39 |
| R64.htm | 32815 | 2023-01-10 16:04:39 |
| R7.htm | 99182 | 2023-01-10 16:04:39 |
| R8.htm | 9355 | 2023-01-10 16:04:39 |
| R9.htm | 31544 | 2023-01-10 16:04:39 |
| report.css | 2768 | 2023-01-10 16:04:39 |
| Show.js | 1086 | 2023-01-10 16:04:39 |