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|---|---|---|
 0001674796-21-000012-index-headers.html | 2021-04-13 18:02:34 | |
| 0001674796-21-000012-index.html | 2021-04-13 18:02:34 | |
| 0001674796-21-000012.txt | 2021-04-13 18:02:34 | |
 0001674796-21-000012-xbrl.zip | 57555 | 2021-04-13 18:02:34 |
| exhibit31-1.htm | 8034 | 2021-04-13 18:02:34 |
| exhibit31-2.htm | 7977 | 2021-04-13 18:02:34 |
| exhibit32-1.htm | 3748 | 2021-04-13 18:02:34 |
| exhibit32-2.htm | 3801 | 2021-04-13 18:02:34 |
| FilingSummary.xml | 22594 | 2021-04-13 18:02:34 |
| Financial_Report.xlsx | 44152 | 2021-04-13 18:02:34 |
| hstc-20201231.htm | 303659 | 2021-04-13 18:02:34 |
| hstc-20201231.xsd | 40988 | 2021-04-13 18:02:34 |
| hstc-20201231_cal.xml | 17151 | 2021-04-13 18:02:34 |
| hstc-20201231_def.xml | 27388 | 2021-04-13 18:02:34 |
| hstc-20201231_htm.xml | 125942 | 2021-04-13 18:02:34 |
| hstc-20201231_lab.xml | 102305 | 2021-04-13 18:02:34 |
| hstc-20201231_pre.xml | 89857 | 2021-04-13 18:02:34 |
| MetaLinks.json | 229997 | 2021-04-13 18:02:34 |
| R1.htm | 55814 | 2021-04-13 18:02:34 |
| R10.htm | 7912 | 2021-04-13 18:02:34 |
| R11.htm | 15053 | 2021-04-13 18:02:34 |
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| R21.htm | 6268 | 2021-04-13 18:02:34 |
| R22.htm | 5294 | 2021-04-13 18:02:34 |
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| R27.htm | 5542 | 2021-04-13 18:02:34 |
| R28.htm | 7422 | 2021-04-13 18:02:34 |
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| R3.htm | 19502 | 2021-04-13 18:02:34 |
| R30.htm | 10147 | 2021-04-13 18:02:34 |
| R31.htm | 7406 | 2021-04-13 18:02:34 |
| R32.htm | 10225 | 2021-04-13 18:02:34 |
| R33.htm | 10879 | 2021-04-13 18:02:34 |
| R4.htm | 46923 | 2021-04-13 18:02:34 |
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| R6.htm | 60657 | 2021-04-13 18:02:34 |
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| R8.htm | 14475 | 2021-04-13 18:02:34 |
| R9.htm | 6976 | 2021-04-13 18:02:34 |
| report.css | 2767 | 2021-04-13 18:02:34 |
| Show.js | 1085 | 2021-04-13 18:02:34 |