Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001437749-22-005396-index-headers.html | 2022-03-07 16:10:42 | |
| 0001437749-22-005396-index.html | 2022-03-07 16:10:42 | |
| 0001437749-22-005396.txt | 2022-03-07 16:10:42 | |
 0001437749-22-005396-xbrl.zip | 32482 | 2022-03-07 16:10:42 |
| ex_343890.htm | 424811 | 2022-03-07 16:10:42 |
 ex_343890img001.jpg | 6529 | 2022-03-07 16:10:42 |
| FilingSummary.xml | 1767 | 2022-03-07 16:10:42 |
| Financial_Report.xlsx | 5794 | 2022-03-07 16:10:42 |
| hpe20220304_8k.htm | 29903 | 2022-03-07 16:10:42 |
| hpe20220304_8k_htm.xml | 4229 | 2022-03-07 16:10:42 |
| hpk-20220307.xsd | 3982 | 2022-03-07 16:10:42 |
| hpk-20220307_def.xml | 13815 | 2022-03-07 16:10:42 |
| hpk-20220307_lab.xml | 18063 | 2022-03-07 16:10:42 |
| hpk-20220307_pre.xml | 13837 | 2022-03-07 16:10:42 |
| MetaLinks.json | 21883 | 2022-03-07 16:10:42 |
| R1.htm | 44527 | 2022-03-07 16:10:42 |
| report.css | 2767 | 2022-03-07 16:10:42 |
| Show.js | 1085 | 2022-03-07 16:10:42 |