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| 0000859598-19-000054-index.html | 2019-07-24 16:38:36 | |
| 0000859598-19-000054.txt | 2019-07-24 16:38:36 | |
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| ckh-06302019x10q.htm | 3143892 | 2019-07-24 16:38:36 |
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| ckh-06302019xex311.htm | 13004 | 2019-07-24 16:38:36 |
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| ckh-06302019xex321.htm | 5394 | 2019-07-24 16:38:36 |
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| ckh-20190630_pre.xml | 436066 | 2019-07-24 16:38:36 |
| FilingSummary.xml | 36002 | 2019-07-24 16:38:36 |
| Financial_Report.xlsx | 90628 | 2019-07-24 16:38:36 |
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| R1.htm | 52557 | 2019-07-24 16:38:36 |
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| report.css | 2767 | 2019-07-24 16:38:36 |
| Show.js | 1085 | 2019-07-24 16:38:36 |