Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001437749-22-002901-index-headers.html | 2022-02-09 17:00:25 | |
| 0001437749-22-002901-index.html | 2022-02-09 17:00:25 | |
| 0001437749-22-002901.txt | 2022-02-09 17:00:25 | |
 0001437749-22-002901-xbrl.zip | 49972 | 2022-02-09 17:00:25 |
 a01.jpg | 12145 | 2022-02-09 17:00:25 |
| ex_332052.htm | 8296 | 2022-02-09 17:00:25 |
| ex_332053.htm | 134190 | 2022-02-09 17:00:25 |
| ex_332054.htm | 158824 | 2022-02-09 17:00:25 |
| ex_333935.htm | 5306 | 2022-02-09 17:00:25 |
| FilingSummary.xml | 1858 | 2022-02-09 17:00:25 |
| Financial_Report.xlsx | 5807 | 2022-02-09 17:00:25 |
| hpe20220204_8k.htm | 82337 | 2022-02-09 17:00:25 |
| hpe20220204_8k_htm.xml | 4315 | 2022-02-09 17:00:25 |
| hpk-20220209.xsd | 3974 | 2022-02-09 17:00:25 |
| hpk-20220209_def.xml | 14086 | 2022-02-09 17:00:25 |
| hpk-20220209_lab.xml | 18503 | 2022-02-09 17:00:25 |
| hpk-20220209_pre.xml | 14167 | 2022-02-09 17:00:25 |
 image01.jpg | 20061 | 2022-02-09 17:00:25 |
| MetaLinks.json | 22460 | 2022-02-09 17:00:25 |
| R1.htm | 46072 | 2022-02-09 17:00:25 |
| report.css | 2767 | 2022-02-09 17:00:25 |
| Show.js | 1085 | 2022-02-09 17:00:25 |