Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000950170-23-002000-index-headers.html | 2023-02-07 16:32:17 | |
| 0000950170-23-002000-index.html | 2023-02-07 16:32:17 | |
| 0000950170-23-002000.txt | 2023-02-07 16:32:17 | |
 0000950170-23-002000-xbrl.zip | 40855 | 2023-02-07 16:32:17 |
| bkh-20230207.htm | 53536 | 2023-02-07 16:32:17 |
| bkh-20230207.xsd | 2484 | 2023-02-07 16:32:17 |
| bkh-20230207_htm.xml | 4517 | 2023-02-07 16:32:17 |
| bkh-20230207_lab.xml | 12806 | 2023-02-07 16:32:17 |
| bkh-20230207_pre.xml | 9464 | 2023-02-07 16:32:17 |
| bkh-ex99.htm | 1014542 | 2023-02-07 16:32:17 |
| FilingSummary.xml | 1735 | 2023-02-07 16:32:17 |
| Financial_Report.xlsx | 5708 | 2023-02-07 16:32:17 |
 img129363028_0.jpg | 75652 | 2023-02-07 16:32:17 |
| MetaLinks.json | 17627 | 2023-02-07 16:32:17 |
| R1.htm | 38115 | 2023-02-07 16:32:17 |
| report.css | 2767 | 2023-02-07 16:32:17 |
| Show.js | 1085 | 2023-02-07 16:32:17 |