Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001674796-22-000007-index-headers.html | 2022-03-04 14:55:52 | |
| 0001674796-22-000007-index.html | 2022-03-04 14:55:52 | |
| 0001674796-22-000007.txt | 2022-03-04 14:55:52 | |
 0001674796-22-000007-xbrl.zip | 53084 | 2022-03-04 14:55:52 |
| exhibit31-1.htm | 8034 | 2022-03-04 14:55:52 |
| exhibit31-2.htm | 7977 | 2022-03-04 14:55:52 |
| exhibit32-1.htm | 3683 | 2022-03-04 14:55:52 |
| exhibit32-2.htm | 3800 | 2022-03-04 14:55:52 |
| FilingSummary.xml | 23705 | 2022-03-04 14:55:52 |
| Financial_Report.xlsx | 40096 | 2022-03-04 14:55:52 |
| hstc-20211231.htm | 272704 | 2022-03-04 14:55:52 |
| hstc-20211231.xsd | 41409 | 2022-03-04 14:55:52 |
| hstc-20211231_cal.xml | 15359 | 2022-03-04 14:55:52 |
| hstc-20211231_def.xml | 27046 | 2022-03-04 14:55:52 |
| hstc-20211231_htm.xml | 103557 | 2022-03-04 14:55:52 |
| hstc-20211231_lab.xml | 100064 | 2022-03-04 14:55:52 |
| hstc-20211231_pre.xml | 88628 | 2022-03-04 14:55:52 |
| MetaLinks.json | 227082 | 2022-03-04 14:55:52 |
| R1.htm | 55917 | 2022-03-04 14:55:52 |
| R10.htm | 14474 | 2022-03-04 14:55:52 |
| R11.htm | 6979 | 2022-03-04 14:55:52 |
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| R15.htm | 18459 | 2022-03-04 14:55:52 |
| R16.htm | 5159 | 2022-03-04 14:55:52 |
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| R19.htm | 4973 | 2022-03-04 14:55:52 |
| R2.htm | 72581 | 2022-03-04 14:55:52 |
| R20.htm | 6629 | 2022-03-04 14:55:52 |
| R21.htm | 5632 | 2022-03-04 14:55:52 |
| R22.htm | 8149 | 2022-03-04 14:55:52 |
| R23.htm | 6270 | 2022-03-04 14:55:52 |
| R24.htm | 5292 | 2022-03-04 14:55:52 |
| R25.htm | 7011 | 2022-03-04 14:55:52 |
| R26.htm | 4784 | 2022-03-04 14:55:52 |
| R27.htm | 14321 | 2022-03-04 14:55:52 |
| R28.htm | 7432 | 2022-03-04 14:55:52 |
| R29.htm | 9786 | 2022-03-04 14:55:52 |
| R3.htm | 19504 | 2022-03-04 14:55:52 |
| R30.htm | 10149 | 2022-03-04 14:55:52 |
| R31.htm | 4213 | 2022-03-04 14:55:52 |
| R32.htm | 5811 | 2022-03-04 14:55:52 |
| R33.htm | 7416 | 2022-03-04 14:55:52 |
| R34.htm | 10226 | 2022-03-04 14:55:52 |
| R35.htm | 10880 | 2022-03-04 14:55:52 |
| R4.htm | 44416 | 2022-03-04 14:55:52 |
| R5.htm | 14649 | 2022-03-04 14:55:52 |
| R6.htm | 54565 | 2022-03-04 14:55:52 |
| R7.htm | 6289 | 2022-03-04 14:55:52 |
| R8.htm | 4213 | 2022-03-04 14:55:52 |
| R9.htm | 6983 | 2022-03-04 14:55:52 |
| report.css | 2767 | 2022-03-04 14:55:52 |
| Show.js | 1085 | 2022-03-04 14:55:52 |