Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000859598-20-000004-index-headers.html | 2020-02-28 16:33:00 | |
| 0000859598-20-000004-index.html | 2020-02-28 16:33:00 | |
| 0000859598-20-000004.txt | 2020-02-28 16:33:00 | |
 0000859598-20-000004-xbrl.zip | 48698 | 2020-02-28 16:33:00 |
| ckh-20200228.htm | 43891 | 2020-02-28 16:33:00 |
| ckh-20200228.xsd | 2586 | 2020-02-28 16:33:00 |
| ckh-20200228_cal.xml | 730 | 2020-02-28 16:33:00 |
| ckh-20200228_def.xml | 21327 | 2020-02-28 16:33:00 |
| ckh-20200228_htm.xml | 10220 | 2020-02-28 16:33:00 |
| ckh-20200228_lab.xml | 37601 | 2020-02-28 16:33:00 |
| ckh-20200228_pre.xml | 21848 | 2020-02-28 16:33:00 |
 colorlogockh1.jpg | 16419 | 2020-02-28 16:33:00 |
| exhibit99q42019earning.htm | 1161673 | 2020-02-28 16:33:00 |
| FilingSummary.xml | 1733 | 2020-02-28 16:33:00 |
| Financial_Report.xlsx | 5838 | 2020-02-28 16:33:00 |
| MetaLinks.json | 26746 | 2020-02-28 16:33:00 |
| R1.htm | 43930 | 2020-02-28 16:33:00 |
| report.css | 2767 | 2020-02-28 16:33:00 |
| Show.js | 1085 | 2020-02-28 16:33:00 |