Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000059255-23-000030-index-headers.html | 2023-04-05 16:17:16 | |
| 0000059255-23-000030-index.html | 2023-04-05 16:17:16 | |
| 0000059255-23-000030.txt | 2023-04-05 16:17:16 | |
 0000059255-23-000030-xbrl.zip | 201931 | 2023-04-05 16:17:16 |
| FilingSummary.xml | 2855 | 2023-04-05 16:17:16 |
| Financial_Report.xlsx | 7943 | 2023-04-05 16:17:16 |
| MetaLinks.json | 57017 | 2023-04-05 16:17:16 |
| R1.htm | 8971 | 2023-04-05 16:17:16 |
| R2.htm | 112156 | 2023-04-05 16:17:16 |
| report.css | 2767 | 2023-04-05 16:17:16 |
| Show.js | 1085 | 2023-04-05 16:17:16 |
| vhl-20230525.xsd | 3351 | 2023-04-05 16:17:16 |
| vhl-20230525xdef14a.htm | 1052047 | 2023-04-05 16:17:16 |
 vhl-20230525xdef14a001.jpg | 11170 | 2023-04-05 16:17:16 |
 vhl-20230525xdef14a002.jpg | 4471 | 2023-04-05 16:17:16 |
 vhl-20230525xdef14a003.jpg | 7218 | 2023-04-05 16:17:16 |
 vhl-20230525xdef14a004.jpg | 2517 | 2023-04-05 16:17:16 |
 vhl-20230525xdef14a014.jpg | 50248 | 2023-04-05 16:17:16 |
 vhl-20230525xdef14a015.jpg | 46755 | 2023-04-05 16:17:16 |
 vhl-20230525xdef14a017.jpg | 3218 | 2023-04-05 16:17:16 |
 vhl-20230525xdef14a018.jpg | 1501 | 2023-04-05 16:17:16 |
 vhl-20230525xdef14a019.jpg | 1493 | 2023-04-05 16:17:16 |
 vhl-20230525xdef14a020.jpg | 3781 | 2023-04-05 16:17:16 |
 vhl-20230525xdef14a021.jpg | 3482 | 2023-04-05 16:17:16 |
| vhl-20230525xdef14a_htm.xml | 97552 | 2023-04-05 16:17:16 |
| vhl-20230525_lab.xml | 3703 | 2023-04-05 16:17:16 |
| vhl-20230525_pre.xml | 3061 | 2023-04-05 16:17:16 |