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 0001130464-20-000037-index-headers.html | 2020-09-18 16:52:45 | |
| 0001130464-20-000037-index.html | 2020-09-18 16:52:45 | |
| 0001130464-20-000037.txt | 2020-09-18 16:52:45 | |
 0001130464-20-000037-xbrl.zip | 14905 | 2020-09-18 16:52:45 |
 bhcreadyorangeblacka031.jpg | 33146 | 2020-09-18 16:52:45 |
| bkh-20200916.htm | 40866 | 2020-09-18 16:52:45 |
| bkh-20200916.xsd | 2768 | 2020-09-18 16:52:45 |
| bkh-20200916_cal.xml | 814 | 2020-09-18 16:52:45 |
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| bkh-20200916_htm.xml | 10771 | 2020-09-18 16:52:45 |
| bkh-20200916_lab.xml | 24572 | 2020-09-18 16:52:45 |
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| ex-99bodpressrelease.htm | 9317 | 2020-09-18 16:52:45 |
| FilingSummary.xml | 1818 | 2020-09-18 16:52:45 |
| Financial_Report.xlsx | 5457 | 2020-09-18 16:52:45 |
| MetaLinks.json | 18204 | 2020-09-18 16:52:45 |
| R1.htm | 38665 | 2020-09-18 16:52:45 |
| report.css | 2767 | 2020-09-18 16:52:45 |
| Show.js | 1085 | 2020-09-18 16:52:45 |