Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000950170-23-006487-index-headers.html | 2023-03-07 17:01:49 | |
| 0000950170-23-006487-index.html | 2023-03-07 17:01:49 | |
| 0000950170-23-006487.txt | 2023-03-07 17:01:49 | |
 0000950170-23-006487-xbrl.zip | 88633 | 2023-03-07 17:01:49 |
| bkh-20230302.htm | 83697 | 2023-03-07 17:01:49 |
| bkh-20230302.xsd | 2484 | 2023-03-07 17:01:49 |
| bkh-20230302_htm.xml | 4734 | 2023-03-07 17:01:49 |
| bkh-20230302_lab.xml | 13474 | 2023-03-07 17:01:49 |
| bkh-20230302_pre.xml | 9911 | 2023-03-07 17:01:49 |
| bkh-ex1_1.htm | 406943 | 2023-03-07 17:01:49 |
| bkh-ex4_1.htm | 227106 | 2023-03-07 17:01:49 |
| bkh-ex5_1.htm | 48179 | 2023-03-07 17:01:49 |
| bkh-ex5_2.htm | 42966 | 2023-03-07 17:01:49 |
| FilingSummary.xml | 1829 | 2023-03-07 17:01:49 |
| Financial_Report.xlsx | 5743 | 2023-03-07 17:01:49 |
 img207001081_0.jpg | 82810 | 2023-03-07 17:01:49 |
 img207924602_0.jpg | 49010 | 2023-03-07 17:01:49 |
| MetaLinks.json | 18216 | 2023-03-07 17:01:49 |
| R1.htm | 39709 | 2023-03-07 17:01:49 |
| report.css | 2767 | 2023-03-07 17:01:49 |
| Show.js | 1085 | 2023-03-07 17:01:49 |