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| 0001628280-23-015261-index.html | 2023-05-03 16:53:01 | |
| 0001628280-23-015261.txt | 2023-05-03 16:53:01 | |
 0001628280-23-015261-xbrl.zip | 412335 | 2023-05-03 16:53:01 |
| cpk-20230331.htm | 2324092 | 2023-05-03 16:53:01 |
| cpk-20230331.xsd | 96744 | 2023-05-03 16:53:01 |
| cpk-20230331_cal.xml | 84009 | 2023-05-03 16:53:01 |
| cpk-20230331_def.xml | 537000 | 2023-05-03 16:53:01 |
| cpk-20230331_htm.xml | 2017682 | 2023-05-03 16:53:01 |
| cpk-20230331_lab.xml | 971356 | 2023-05-03 16:53:01 |
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| cpk3312023ex-311.htm | 10279 | 2023-05-03 16:53:01 |
| cpk3312023ex-312.htm | 10673 | 2023-05-03 16:53:01 |
| cpk3312023ex-321.htm | 4983 | 2023-05-03 16:53:01 |
| cpk3312023ex-322.htm | 5286 | 2023-05-03 16:53:01 |
| FilingSummary.xml | 49396 | 2023-05-03 16:53:01 |
| Financial_Report.xlsx | 129202 | 2023-05-03 16:53:01 |
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| report.css | 2767 | 2023-05-03 16:53:01 |
| Show.js | 1085 | 2023-05-03 16:53:01 |