Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000859598-21-000004-index-headers.html | 2021-02-19 16:39:37 | |
| 0000859598-21-000004-index.html | 2021-02-19 16:39:37 | |
| 0000859598-21-000004.txt | 2021-02-19 16:39:37 | |
 0000859598-21-000004-xbrl.zip | 41609 | 2021-02-19 16:39:37 |
| ckh-20210219.htm | 36512 | 2021-02-19 16:39:37 |
| ckh-20210219.xsd | 2445 | 2021-02-19 16:39:37 |
| ckh-20210219_cal.xml | 730 | 2021-02-19 16:39:37 |
| ckh-20210219_def.xml | 21299 | 2021-02-19 16:39:37 |
| ckh-20210219_htm.xml | 10239 | 2021-02-19 16:39:37 |
| ckh-20210219_lab.xml | 37606 | 2021-02-19 16:39:37 |
| ckh-20210219_pre.xml | 21848 | 2021-02-19 16:39:37 |
 colorlogockh1.jpg | 16419 | 2021-02-19 16:39:37 |
| exhibit991q42020earningsre.htm | 592254 | 2021-02-19 16:39:37 |
| FilingSummary.xml | 1732 | 2021-02-19 16:39:37 |
| Financial_Report.xlsx | 5492 | 2021-02-19 16:39:37 |
| MetaLinks.json | 26093 | 2021-02-19 16:39:37 |
| R1.htm | 43930 | 2021-02-19 16:39:37 |
| report.css | 2767 | 2021-02-19 16:39:37 |
| Show.js | 1085 | 2021-02-19 16:39:37 |