Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000859598-20-000061-index-headers.html | 2020-07-27 19:06:59 | |
| 0000859598-20-000061-index.html | 2020-07-27 19:06:59 | |
| 0000859598-20-000061.txt | 2020-07-27 19:06:59 | |
 0000859598-20-000061-xbrl.zip | 351453 | 2020-07-27 19:06:59 |
| ckh-06302020xex311.htm | 13189 | 2020-07-27 19:06:59 |
| ckh-06302020xex312.htm | 13149 | 2020-07-27 19:06:59 |
| ckh-06302020xex321.htm | 6475 | 2020-07-27 19:06:59 |
| ckh-06302020xex322.htm | 5800 | 2020-07-27 19:06:59 |
| ckh-20200630.htm | 3669447 | 2020-07-27 19:06:59 |
| ckh-20200630.xsd | 66395 | 2020-07-27 19:06:59 |
| ckh-20200630_cal.xml | 107015 | 2020-07-27 19:06:59 |
| ckh-20200630_def.xml | 283255 | 2020-07-27 19:06:59 |
| ckh-20200630_htm.xml | 2898343 | 2020-07-27 19:06:59 |
| ckh-20200630_lab.xml | 704060 | 2020-07-27 19:06:59 |
| ckh-20200630_pre.xml | 454132 | 2020-07-27 19:06:59 |
| FilingSummary.xml | 39319 | 2020-07-27 19:06:59 |
| Financial_Report.xlsx | 108291 | 2020-07-27 19:06:59 |
| MetaLinks.json | 648353 | 2020-07-27 19:06:59 |
| R1.htm | 52268 | 2020-07-27 19:06:59 |
| R10.htm | 11025 | 2020-07-27 19:06:59 |
| R11.htm | 10548 | 2020-07-27 19:06:59 |
| R12.htm | 20564 | 2020-07-27 19:06:59 |
| R13.htm | 16697 | 2020-07-27 19:06:59 |
| R14.htm | 5907 | 2020-07-27 19:06:59 |
| R15.htm | 40195 | 2020-07-27 19:06:59 |
| R16.htm | 6436 | 2020-07-27 19:06:59 |
| R17.htm | 5912 | 2020-07-27 19:06:59 |
| R18.htm | 5593 | 2020-07-27 19:06:59 |
| R19.htm | 15450 | 2020-07-27 19:06:59 |
| R2.htm | 115714 | 2020-07-27 19:06:59 |
| R20.htm | 37803 | 2020-07-27 19:06:59 |
| R21.htm | 592589 | 2020-07-27 19:06:59 |
| R22.htm | 25555 | 2020-07-27 19:06:59 |
| R23.htm | 144269 | 2020-07-27 19:06:59 |
| R24.htm | 96536 | 2020-07-27 19:06:59 |
| R25.htm | 16837 | 2020-07-27 19:06:59 |
| R26.htm | 21410 | 2020-07-27 19:06:59 |
| R27.htm | 14960 | 2020-07-27 19:06:59 |
| R28.htm | 37020 | 2020-07-27 19:06:59 |
| R29.htm | 15441 | 2020-07-27 19:06:59 |
| R3.htm | 76229 | 2020-07-27 19:06:59 |
| R30.htm | 24220 | 2020-07-27 19:06:59 |
| R31.htm | 593726 | 2020-07-27 19:06:59 |
| R32.htm | 27160 | 2020-07-27 19:06:59 |
| R33.htm | 9857 | 2020-07-27 19:06:59 |
| R34.htm | 9545 | 2020-07-27 19:06:59 |
| R35.htm | 25728 | 2020-07-27 19:06:59 |
| R36.htm | 5050 | 2020-07-27 19:06:59 |
| R37.htm | 14399 | 2020-07-27 19:06:59 |
| R38.htm | 54364 | 2020-07-27 19:06:59 |
| R39.htm | 13655 | 2020-07-27 19:06:59 |
| R4.htm | 32189 | 2020-07-27 19:06:59 |
| R40.htm | 26468 | 2020-07-27 19:06:59 |
| R41.htm | 25665 | 2020-07-27 19:06:59 |
| R42.htm | 49088 | 2020-07-27 19:06:59 |
| R43.htm | 55661 | 2020-07-27 19:06:59 |
| R44.htm | 28864 | 2020-07-27 19:06:59 |
| R45.htm | 11173 | 2020-07-27 19:06:59 |
| R46.htm | 11394 | 2020-07-27 19:06:59 |
| R47.htm | 30310 | 2020-07-27 19:06:59 |
| R48.htm | 13456 | 2020-07-27 19:06:59 |
| R49.htm | 18195 | 2020-07-27 19:06:59 |
| R5.htm | 53541 | 2020-07-27 19:06:59 |
| R50.htm | 31084 | 2020-07-27 19:06:59 |
| R51.htm | 14566 | 2020-07-27 19:06:59 |
| R52.htm | 14088 | 2020-07-27 19:06:59 |
| R53.htm | 7703 | 2020-07-27 19:06:59 |
| R54.htm | 29026 | 2020-07-27 19:06:59 |
| R55.htm | 52053 | 2020-07-27 19:06:59 |
| R56.htm | 144487 | 2020-07-27 19:06:59 |
| R57.htm | 96244 | 2020-07-27 19:06:59 |
| R58.htm | 13168 | 2020-07-27 19:06:59 |
| R59.htm | 11196 | 2020-07-27 19:06:59 |
| R6.htm | 55664 | 2020-07-27 19:06:59 |
| R60.htm | 14446 | 2020-07-27 19:06:59 |
| R61.htm | 14780 | 2020-07-27 19:06:59 |
| R7.htm | 125602 | 2020-07-27 19:06:59 |
| R8.htm | 18151 | 2020-07-27 19:06:59 |
| R9.htm | 6401 | 2020-07-27 19:06:59 |
| R9999.htm | 17899 | 2020-07-27 19:06:59 |
| report.css | 2767 | 2020-07-27 19:06:59 |
| Show.js | 1085 | 2020-07-27 19:06:59 |