Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001564590-21-043509-index-headers.html | 2021-08-11 17:03:11 | |
| 0001564590-21-043509-index.html | 2021-08-11 17:03:11 | |
| 0001564590-21-043509.txt | 2021-08-11 17:03:11 | |
 0001564590-21-043509-xbrl.zip | 328794 | 2021-08-11 17:03:11 |
| FilingSummary.xml | 69175 | 2021-08-11 17:03:11 |
| Financial_Report.xlsx | 155683 | 2021-08-11 17:03:11 |
| meg-10q_20210630.htm | 5197089 | 2021-08-11 17:03:11 |
| meg-10q_20210630_htm.xml | 5737872 | 2021-08-11 17:03:11 |
| meg-20210630.xsd | 110768 | 2021-08-11 17:03:11 |
| meg-20210630_cal.xml | 121877 | 2021-08-11 17:03:11 |
| meg-20210630_def.xml | 420237 | 2021-08-11 17:03:11 |
| meg-20210630_lab.xml | 790069 | 2021-08-11 17:03:11 |
| meg-20210630_pre.xml | 671177 | 2021-08-11 17:03:11 |
| meg-ex311_8.htm | 20980 | 2021-08-11 17:03:11 |
| meg-ex312_7.htm | 20671 | 2021-08-11 17:03:11 |
| meg-ex321_9.htm | 10470 | 2021-08-11 17:03:11 |
| meg-ex322_6.htm | 10443 | 2021-08-11 17:03:11 |
| MetaLinks.json | 1065935 | 2021-08-11 17:03:11 |
| R1.htm | 54055 | 2021-08-11 17:03:11 |
| R10.htm | 25133 | 2021-08-11 17:03:11 |
| R100.htm | 9062 | 2021-08-11 17:03:11 |
| R101.htm | 18917 | 2021-08-11 17:03:11 |
| R102.htm | 12250 | 2021-08-11 17:03:11 |
| R11.htm | 67965 | 2021-08-11 17:03:11 |
| R12.htm | 140569 | 2021-08-11 17:03:11 |
| R13.htm | 340906 | 2021-08-11 17:03:11 |
| R14.htm | 148408 | 2021-08-11 17:03:11 |
| R15.htm | 36772 | 2021-08-11 17:03:11 |
| R16.htm | 32438 | 2021-08-11 17:03:11 |
| R17.htm | 9693 | 2021-08-11 17:03:11 |
| R18.htm | 7354 | 2021-08-11 17:03:11 |
| R19.htm | 179496 | 2021-08-11 17:03:11 |
| R2.htm | 104083 | 2021-08-11 17:03:11 |
| R20.htm | 237775 | 2021-08-11 17:03:11 |
| R21.htm | 7300 | 2021-08-11 17:03:11 |
| R22.htm | 8920 | 2021-08-11 17:03:11 |
| R23.htm | 15783 | 2021-08-11 17:03:11 |
| R24.htm | 728828 | 2021-08-11 17:03:11 |
| R25.htm | 93052 | 2021-08-11 17:03:11 |
| R26.htm | 269816 | 2021-08-11 17:03:11 |
| R27.htm | 7816 | 2021-08-11 17:03:11 |
| R28.htm | 8347 | 2021-08-11 17:03:11 |
| R29.htm | 38422 | 2021-08-11 17:03:11 |
| R3.htm | 25534 | 2021-08-11 17:03:11 |
| R30.htm | 20097 | 2021-08-11 17:03:11 |
| R31.htm | 68552 | 2021-08-11 17:03:11 |
| R32.htm | 24952 | 2021-08-11 17:03:11 |
| R33.htm | 65103 | 2021-08-11 17:03:11 |
| R34.htm | 141909 | 2021-08-11 17:03:11 |
| R35.htm | 330100 | 2021-08-11 17:03:11 |
| R36.htm | 151700 | 2021-08-11 17:03:11 |
| R37.htm | 36747 | 2021-08-11 17:03:11 |
| R38.htm | 31835 | 2021-08-11 17:03:11 |
| R39.htm | 176226 | 2021-08-11 17:03:11 |
| R4.htm | 78189 | 2021-08-11 17:03:11 |
| R40.htm | 234336 | 2021-08-11 17:03:11 |
| R41.htm | 734822 | 2021-08-11 17:03:11 |
| R42.htm | 92492 | 2021-08-11 17:03:11 |
| R43.htm | 266654 | 2021-08-11 17:03:11 |
| R44.htm | 86842 | 2021-08-11 17:03:11 |
| R45.htm | 26755 | 2021-08-11 17:03:11 |
| R46.htm | 46029 | 2021-08-11 17:03:11 |
| R47.htm | 6897 | 2021-08-11 17:03:11 |
| R48.htm | 35081 | 2021-08-11 17:03:11 |
| R49.htm | 12135 | 2021-08-11 17:03:11 |
| R5.htm | 84406 | 2021-08-11 17:03:11 |
| R50.htm | 12013 | 2021-08-11 17:03:11 |
| R51.htm | 12330 | 2021-08-11 17:03:11 |
| R52.htm | 12792 | 2021-08-11 17:03:11 |
| R53.htm | 36637 | 2021-08-11 17:03:11 |
| R54.htm | 9809 | 2021-08-11 17:03:11 |
| R55.htm | 23509 | 2021-08-11 17:03:11 |
| R56.htm | 24675 | 2021-08-11 17:03:11 |
| R57.htm | 13399 | 2021-08-11 17:03:11 |
| R58.htm | 11388 | 2021-08-11 17:03:11 |
| R59.htm | 34727 | 2021-08-11 17:03:11 |
| R6.htm | 131862 | 2021-08-11 17:03:11 |
| R60.htm | 29302 | 2021-08-11 17:03:11 |
| R61.htm | 93268 | 2021-08-11 17:03:11 |
| R62.htm | 31085 | 2021-08-11 17:03:11 |
| R63.htm | 66648 | 2021-08-11 17:03:11 |
| R64.htm | 13127 | 2021-08-11 17:03:11 |
| R65.htm | 14353 | 2021-08-11 17:03:11 |
| R66.htm | 35520 | 2021-08-11 17:03:11 |
| R67.htm | 5637 | 2021-08-11 17:03:11 |
| R68.htm | 17194 | 2021-08-11 17:03:11 |
| R69.htm | 17529 | 2021-08-11 17:03:11 |
| R7.htm | 12648 | 2021-08-11 17:03:11 |
| R70.htm | 14777 | 2021-08-11 17:03:11 |
| R71.htm | 13440 | 2021-08-11 17:03:11 |
| R72.htm | 33986 | 2021-08-11 17:03:11 |
| R73.htm | 22086 | 2021-08-11 17:03:11 |
| R74.htm | 128457 | 2021-08-11 17:03:11 |
| R75.htm | 12625 | 2021-08-11 17:03:11 |
| R76.htm | 39140 | 2021-08-11 17:03:11 |
| R77.htm | 36366 | 2021-08-11 17:03:11 |
| R78.htm | 17628 | 2021-08-11 17:03:11 |
| R79.htm | 15047 | 2021-08-11 17:03:11 |
| R8.htm | 24084 | 2021-08-11 17:03:11 |
| R80.htm | 43150 | 2021-08-11 17:03:11 |
| R81.htm | 19196 | 2021-08-11 17:03:11 |
| R82.htm | 6058 | 2021-08-11 17:03:11 |
| R83.htm | 43756 | 2021-08-11 17:03:11 |
| R84.htm | 64652 | 2021-08-11 17:03:11 |
| R85.htm | 53153 | 2021-08-11 17:03:11 |
| R86.htm | 44435 | 2021-08-11 17:03:11 |
| R87.htm | 12081 | 2021-08-11 17:03:11 |
| R88.htm | 25757 | 2021-08-11 17:03:11 |
| R89.htm | 13026 | 2021-08-11 17:03:11 |
| R9.htm | 73674 | 2021-08-11 17:03:11 |
| R90.htm | 88975 | 2021-08-11 17:03:11 |
| R91.htm | 19434 | 2021-08-11 17:03:11 |
| R92.htm | 11372 | 2021-08-11 17:03:11 |
| R93.htm | 34741 | 2021-08-11 17:03:11 |
| R94.htm | 11675 | 2021-08-11 17:03:11 |
| R95.htm | 6829 | 2021-08-11 17:03:11 |
| R96.htm | 23561 | 2021-08-11 17:03:11 |
| R97.htm | 43973 | 2021-08-11 17:03:11 |
| R98.htm | 15107 | 2021-08-11 17:03:11 |
| R99.htm | 22165 | 2021-08-11 17:03:11 |
| report.css | 2768 | 2021-08-11 17:03:11 |
| Show.js | 1086 | 2021-08-11 17:03:11 |