Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000931148-22-000143-index-headers.html | 2022-11-04 16:13:11 | |
| 0000931148-22-000143-index.html | 2022-11-04 16:13:11 | |
| 0000931148-22-000143.txt | 2022-11-04 16:13:11 | |
 0000931148-22-000143-xbrl.zip | 274933 | 2022-11-04 16:13:11 |
| a2022-3q10qex311.htm | 10072 | 2022-11-04 16:13:11 |
| a2022-3q10qex312.htm | 10123 | 2022-11-04 16:13:11 |
| a2022-3q10qex321.htm | 5934 | 2022-11-04 16:13:11 |
| a2022-3q10qex322.htm | 5847 | 2022-11-04 16:13:11 |
| FilingSummary.xml | 40380 | 2022-11-04 16:13:11 |
| Financial_Report.xlsx | 96703 | 2022-11-04 16:13:11 |
| gti-20220930.htm | 1691705 | 2022-11-04 16:13:11 |
| gti-20220930.xsd | 42351 | 2022-11-04 16:13:11 |
| gti-20220930_cal.xml | 60954 | 2022-11-04 16:13:11 |
| gti-20220930_def.xml | 223190 | 2022-11-04 16:13:11 |
 gti-20220930_g1.jpg | 13851 | 2022-11-04 16:13:11 |
| gti-20220930_htm.xml | 1103385 | 2022-11-04 16:13:11 |
| gti-20220930_lab.xml | 514206 | 2022-11-04 16:13:11 |
| gti-20220930_pre.xml | 381780 | 2022-11-04 16:13:11 |
| MetaLinks.json | 579770 | 2022-11-04 16:13:11 |
| R1.htm | 51512 | 2022-11-04 16:13:11 |
| R10.htm | 39743 | 2022-11-04 16:13:11 |
| R11.htm | 24327 | 2022-11-04 16:13:11 |
| R12.htm | 28529 | 2022-11-04 16:13:11 |
| R13.htm | 12202 | 2022-11-04 16:13:11 |
| R14.htm | 23782 | 2022-11-04 16:13:11 |
| R15.htm | 17797 | 2022-11-04 16:13:11 |
| R16.htm | 21276 | 2022-11-04 16:13:11 |
| R17.htm | 72646 | 2022-11-04 16:13:11 |
| R18.htm | 12315 | 2022-11-04 16:13:11 |
| R19.htm | 27626 | 2022-11-04 16:13:11 |
| R2.htm | 103099 | 2022-11-04 16:13:11 |
| R20.htm | 13594 | 2022-11-04 16:13:11 |
| R21.htm | 13335 | 2022-11-04 16:13:11 |
| R22.htm | 35411 | 2022-11-04 16:13:11 |
| R23.htm | 23612 | 2022-11-04 16:13:11 |
| R24.htm | 17947 | 2022-11-04 16:13:11 |
| R25.htm | 13230 | 2022-11-04 16:13:11 |
| R26.htm | 20914 | 2022-11-04 16:13:11 |
| R27.htm | 8673 | 2022-11-04 16:13:11 |
| R28.htm | 15114 | 2022-11-04 16:13:11 |
| R29.htm | 68043 | 2022-11-04 16:13:11 |
| R3.htm | 20545 | 2022-11-04 16:13:11 |
| R30.htm | 11754 | 2022-11-04 16:13:11 |
| R31.htm | 25020 | 2022-11-04 16:13:11 |
| R32.htm | 8810 | 2022-11-04 16:13:11 |
| R33.htm | 11499 | 2022-11-04 16:13:11 |
| R34.htm | 6324 | 2022-11-04 16:13:11 |
| R35.htm | 15212 | 2022-11-04 16:13:11 |
| R36.htm | 10803 | 2022-11-04 16:13:11 |
| R37.htm | 19616 | 2022-11-04 16:13:11 |
| R38.htm | 35862 | 2022-11-04 16:13:11 |
| R39.htm | 6236 | 2022-11-04 16:13:11 |
| R4.htm | 86396 | 2022-11-04 16:13:11 |
| R40.htm | 17760 | 2022-11-04 16:13:11 |
| R41.htm | 16953 | 2022-11-04 16:13:11 |
| R42.htm | 21976 | 2022-11-04 16:13:11 |
| R43.htm | 11473 | 2022-11-04 16:13:11 |
| R44.htm | 28881 | 2022-11-04 16:13:11 |
| R45.htm | 34257 | 2022-11-04 16:13:11 |
| R46.htm | 22262 | 2022-11-04 16:13:11 |
| R47.htm | 10680 | 2022-11-04 16:13:11 |
| R48.htm | 18257 | 2022-11-04 16:13:11 |
| R49.htm | 23589 | 2022-11-04 16:13:11 |
| R5.htm | 8252 | 2022-11-04 16:13:11 |
| R50.htm | 26971 | 2022-11-04 16:13:11 |
| R51.htm | 9820 | 2022-11-04 16:13:11 |
| R52.htm | 13763 | 2022-11-04 16:13:11 |
| R53.htm | 11460 | 2022-11-04 16:13:11 |
| R54.htm | 52292 | 2022-11-04 16:13:11 |
| R55.htm | 16124 | 2022-11-04 16:13:11 |
| R56.htm | 26027 | 2022-11-04 16:13:11 |
| R57.htm | 15141 | 2022-11-04 16:13:11 |
| R58.htm | 20820 | 2022-11-04 16:13:11 |
| R59.htm | 12467 | 2022-11-04 16:13:11 |
| R6.htm | 90004 | 2022-11-04 16:13:11 |
| R60.htm | 53523 | 2022-11-04 16:13:11 |
| R61.htm | 41124 | 2022-11-04 16:13:11 |
| R62.htm | 11274 | 2022-11-04 16:13:11 |
| R7.htm | 127791 | 2022-11-04 16:13:11 |
| R8.htm | 19619 | 2022-11-04 16:13:11 |
| R9.htm | 13337 | 2022-11-04 16:13:11 |
| report.css | 2767 | 2022-11-04 16:13:11 |
| Show.js | 1085 | 2022-11-04 16:13:11 |