Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001437749-22-019357-index-headers.html | 2022-08-08 16:05:33 | |
| 0001437749-22-019357-index.html | 2022-08-08 16:05:33 | |
| 0001437749-22-019357.txt | 2022-08-08 16:05:33 | |
 0001437749-22-019357-xbrl.zip | 29181 | 2022-08-08 16:05:33 |
| ex_407670.htm | 349742 | 2022-08-08 16:05:33 |
 ex_407670img001.jpg | 6529 | 2022-08-08 16:05:33 |
| FilingSummary.xml | 1764 | 2022-08-08 16:05:33 |
| Financial_Report.xlsx | 5839 | 2022-08-08 16:05:33 |
| hpe20220803_8k.htm | 35143 | 2022-08-08 16:05:33 |
| hpe20220803_8k_htm.xml | 4230 | 2022-08-08 16:05:33 |
| hpk-20220808.xsd | 3983 | 2022-08-08 16:05:33 |
| hpk-20220808_def.xml | 13816 | 2022-08-08 16:05:33 |
| hpk-20220808_lab.xml | 18064 | 2022-08-08 16:05:33 |
| hpk-20220808_pre.xml | 13838 | 2022-08-08 16:05:33 |
| MetaLinks.json | 21998 | 2022-08-08 16:05:33 |
| R1.htm | 44495 | 2022-08-08 16:05:33 |
| report.css | 2767 | 2022-08-08 16:05:33 |
| Show.js | 1085 | 2022-08-08 16:05:33 |