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| 0001437749-21-012315-index.html | 2021-05-14 16:01:31 | |
| 0001437749-21-012315.txt | 2021-05-14 16:01:31 | |
 0001437749-21-012315-xbrl.zip | 84713 | 2021-05-14 16:01:31 |
| ex_241684.htm | 10565 | 2021-05-14 16:01:31 |
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| ex_241687.htm | 5218 | 2021-05-14 16:01:31 |
| FilingSummary.xml | 20902 | 2021-05-14 16:01:31 |
| Financial_Report.xlsx | 38628 | 2021-05-14 16:01:31 |
| MetaLinks.json | 345461 | 2021-05-14 16:01:31 |
| npk-20210404.xsd | 26734 | 2021-05-14 16:01:31 |
| npk-20210404_cal.xml | 36550 | 2021-05-14 16:01:31 |
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| npk-20210404_lab.xml | 176901 | 2021-05-14 16:01:31 |
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| npk20210416_10q.htm | 543296 | 2021-05-14 16:01:31 |
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| R1.htm | 52476 | 2021-05-14 16:01:31 |
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| R8.htm | 5823 | 2021-05-14 16:01:31 |
| R9.htm | 6992 | 2021-05-14 16:01:31 |
| report.css | 2767 | 2021-05-14 16:01:31 |
| Show.js | 1085 | 2021-05-14 16:01:31 |