Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000931148-23-000035-index-headers.html | 2023-02-14 16:12:25 | |
| 0000931148-23-000035-index.html | 2023-02-14 16:12:25 | |
| 0000931148-23-000035.txt | 2023-02-14 16:12:25 | |
 0000931148-23-000035-xbrl.zip | 610721 | 2023-02-14 16:12:25 |
| a2022-10kex231dtconsent.htm | 2369 | 2023-02-14 16:12:25 |
| a2022-10kex311.htm | 10069 | 2023-02-14 16:12:25 |
| a2022-10kex312.htm | 10096 | 2023-02-14 16:12:25 |
| a2022-10kex321.htm | 5930 | 2023-02-14 16:12:25 |
| a2022-10kex322.htm | 5842 | 2023-02-14 16:12:25 |
| a2022-ex211listofsubsidiar.htm | 22577 | 2023-02-14 16:12:25 |
| exhibit1015taxreceivableag.htm | 269493 | 2023-02-14 16:12:25 |
| exhibit1038formofretention.htm | 40227 | 2023-02-14 16:12:25 |
| exhibit10392023restricteds.htm | 53821 | 2023-02-14 16:12:25 |
| exhibit1041directordeferre.htm | 36429 | 2023-02-14 16:12:25 |
| exhibit1042formofdirectord.htm | 31002 | 2023-02-14 16:12:25 |
| exhibit10orm2023deferredre.htm | 53377 | 2023-02-14 16:12:25 |
| FilingSummary.xml | 81984 | 2023-02-14 16:12:25 |
| Financial_Report.xlsx | 194086 | 2023-02-14 16:12:25 |
| gti-20221231.htm | 2906003 | 2023-02-14 16:12:25 |
| gti-20221231.xsd | 84432 | 2023-02-14 16:12:25 |
| gti-20221231_cal.xml | 112689 | 2023-02-14 16:12:25 |
| gti-20221231_def.xml | 556988 | 2023-02-14 16:12:25 |
 gti-20221231_g1.jpg | 13851 | 2023-02-14 16:12:25 |
 gti-20221231_g2.jpg | 19039 | 2023-02-14 16:12:25 |
| gti-20221231_htm.xml | 2608716 | 2023-02-14 16:12:25 |
| gti-20221231_lab.xml | 1059728 | 2023-02-14 16:12:25 |
| gti-20221231_pre.xml | 889159 | 2023-02-14 16:12:25 |
 image_0.jpg | 112 | 2023-02-14 16:12:25 |
 image_1.jpg | 103 | 2023-02-14 16:12:25 |
| MetaLinks.json | 1270763 | 2023-02-14 16:12:25 |
| R1.htm | 62445 | 2023-02-14 16:12:25 |
| R10.htm | 61410 | 2023-02-14 16:12:25 |
| R100.htm | 47695 | 2023-02-14 16:12:25 |
| R101.htm | 6821 | 2023-02-14 16:12:25 |
| R102.htm | 23710 | 2023-02-14 16:12:25 |
| R103.htm | 9941 | 2023-02-14 16:12:25 |
| R104.htm | 20978 | 2023-02-14 16:12:25 |
| R105.htm | 18325 | 2023-02-14 16:12:25 |
| R106.htm | 11138 | 2023-02-14 16:12:25 |
| R107.htm | 14081 | 2023-02-14 16:12:25 |
| R108.htm | 12104 | 2023-02-14 16:12:25 |
| R109.htm | 12425 | 2023-02-14 16:12:25 |
| R11.htm | 30999 | 2023-02-14 16:12:25 |
| R110.htm | 21510 | 2023-02-14 16:12:25 |
| R111.htm | 30602 | 2023-02-14 16:12:25 |
| R112.htm | 42913 | 2023-02-14 16:12:25 |
| R113.htm | 8849 | 2023-02-14 16:12:25 |
| R114.htm | 11064 | 2023-02-14 16:12:25 |
| R115.htm | 11698 | 2023-02-14 16:12:25 |
| R116.htm | 17133 | 2023-02-14 16:12:25 |
| R117.htm | 36411 | 2023-02-14 16:12:25 |
| R118.htm | 7225 | 2023-02-14 16:12:25 |
| R119.htm | 12514 | 2023-02-14 16:12:25 |
| R12.htm | 53467 | 2023-02-14 16:12:25 |
| R120.htm | 9197 | 2023-02-14 16:12:25 |
| R121.htm | 10463 | 2023-02-14 16:12:25 |
| R13.htm | 32695 | 2023-02-14 16:12:25 |
| R14.htm | 27789 | 2023-02-14 16:12:25 |
| R15.htm | 24644 | 2023-02-14 16:12:25 |
| R16.htm | 21552 | 2023-02-14 16:12:25 |
| R17.htm | 112849 | 2023-02-14 16:12:25 |
| R18.htm | 48318 | 2023-02-14 16:12:25 |
| R19.htm | 43707 | 2023-02-14 16:12:25 |
| R2.htm | 7800 | 2023-02-14 16:12:25 |
| R20.htm | 182389 | 2023-02-14 16:12:25 |
| R21.htm | 26378 | 2023-02-14 16:12:25 |
| R22.htm | 99754 | 2023-02-14 16:12:25 |
| R23.htm | 19747 | 2023-02-14 16:12:25 |
| R24.htm | 20856 | 2023-02-14 16:12:25 |
| R25.htm | 18702 | 2023-02-14 16:12:25 |
| R26.htm | 5408 | 2023-02-14 16:12:25 |
| R27.htm | 118812 | 2023-02-14 16:12:25 |
| R28.htm | 13301 | 2023-02-14 16:12:25 |
| R29.htm | 25681 | 2023-02-14 16:12:25 |
| R3.htm | 109230 | 2023-02-14 16:12:25 |
| R30.htm | 46493 | 2023-02-14 16:12:25 |
| R31.htm | 30833 | 2023-02-14 16:12:25 |
| R32.htm | 18028 | 2023-02-14 16:12:25 |
| R33.htm | 23756 | 2023-02-14 16:12:25 |
| R34.htm | 17982 | 2023-02-14 16:12:25 |
| R35.htm | 111084 | 2023-02-14 16:12:25 |
| R36.htm | 50091 | 2023-02-14 16:12:25 |
| R37.htm | 46627 | 2023-02-14 16:12:25 |
| R38.htm | 180805 | 2023-02-14 16:12:25 |
| R39.htm | 10942 | 2023-02-14 16:12:25 |
| R4.htm | 20586 | 2023-02-14 16:12:25 |
| R40.htm | 101233 | 2023-02-14 16:12:25 |
| R41.htm | 12095 | 2023-02-14 16:12:25 |
| R42.htm | 18699 | 2023-02-14 16:12:25 |
| R43.htm | 16057 | 2023-02-14 16:12:25 |
| R44.htm | 17938 | 2023-02-14 16:12:25 |
| R45.htm | 8602 | 2023-02-14 16:12:25 |
| R46.htm | 22791 | 2023-02-14 16:12:25 |
| R47.htm | 7465 | 2023-02-14 16:12:25 |
| R48.htm | 5590 | 2023-02-14 16:12:25 |
| R49.htm | 16302 | 2023-02-14 16:12:25 |
| R5.htm | 92891 | 2023-02-14 16:12:25 |
| R50.htm | 14341 | 2023-02-14 16:12:25 |
| R51.htm | 14613 | 2023-02-14 16:12:25 |
| R52.htm | 10925 | 2023-02-14 16:12:25 |
| R53.htm | 19533 | 2023-02-14 16:12:25 |
| R54.htm | 10356 | 2023-02-14 16:12:25 |
| R55.htm | 7705 | 2023-02-14 16:12:25 |
| R56.htm | 22747 | 2023-02-14 16:12:25 |
| R57.htm | 44335 | 2023-02-14 16:12:25 |
| R58.htm | 40936 | 2023-02-14 16:12:25 |
| R59.htm | 18628 | 2023-02-14 16:12:25 |
| R6.htm | 7974 | 2023-02-14 16:12:25 |
| R60.htm | 46700 | 2023-02-14 16:12:25 |
| R61.htm | 20290 | 2023-02-14 16:12:25 |
| R62.htm | 24954 | 2023-02-14 16:12:25 |
| R63.htm | 9054 | 2023-02-14 16:12:25 |
| R64.htm | 16700 | 2023-02-14 16:12:25 |
| R65.htm | 19226 | 2023-02-14 16:12:25 |
| R66.htm | 21937 | 2023-02-14 16:12:25 |
| R67.htm | 55600 | 2023-02-14 16:12:25 |
| R68.htm | 26567 | 2023-02-14 16:12:25 |
| R69.htm | 22880 | 2023-02-14 16:12:25 |
| R7.htm | 100057 | 2023-02-14 16:12:25 |
| R70.htm | 17764 | 2023-02-14 16:12:25 |
| R71.htm | 22334 | 2023-02-14 16:12:25 |
| R72.htm | 17820 | 2023-02-14 16:12:25 |
| R73.htm | 24867 | 2023-02-14 16:12:25 |
| R74.htm | 26076 | 2023-02-14 16:12:25 |
| R75.htm | 11620 | 2023-02-14 16:12:25 |
| R76.htm | 49656 | 2023-02-14 16:12:25 |
| R77.htm | 50864 | 2023-02-14 16:12:25 |
| R78.htm | 15540 | 2023-02-14 16:12:25 |
| R79.htm | 24558 | 2023-02-14 16:12:25 |
| R8.htm | 109742 | 2023-02-14 16:12:25 |
| R80.htm | 12146 | 2023-02-14 16:12:25 |
| R81.htm | 21166 | 2023-02-14 16:12:25 |
| R82.htm | 51401 | 2023-02-14 16:12:25 |
| R83.htm | 4593 | 2023-02-14 16:12:25 |
| R84.htm | 13274 | 2023-02-14 16:12:25 |
| R85.htm | 11350 | 2023-02-14 16:12:25 |
| R86.htm | 7158 | 2023-02-14 16:12:25 |
| R87.htm | 20920 | 2023-02-14 16:12:25 |
| R88.htm | 20903 | 2023-02-14 16:12:25 |
| R89.htm | 35275 | 2023-02-14 16:12:25 |
| R9.htm | 13534 | 2023-02-14 16:12:25 |
| R90.htm | 27022 | 2023-02-14 16:12:25 |
| R91.htm | 61104 | 2023-02-14 16:12:25 |
| R92.htm | 43067 | 2023-02-14 16:12:25 |
| R93.htm | 15752 | 2023-02-14 16:12:25 |
| R94.htm | 15392 | 2023-02-14 16:12:25 |
| R95.htm | 13693 | 2023-02-14 16:12:25 |
| R96.htm | 12126 | 2023-02-14 16:12:25 |
| R97.htm | 11382 | 2023-02-14 16:12:25 |
| R98.htm | 23707 | 2023-02-14 16:12:25 |
| R99.htm | 15710 | 2023-02-14 16:12:25 |
| report.css | 2768 | 2023-02-14 16:12:25 |
| Show.js | 1086 | 2023-02-14 16:12:25 |