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 0001437749-21-019894-index-headers.html | 2021-08-13 16:38:27 | |
| 0001437749-21-019894-index.html | 2021-08-13 16:38:27 | |
| 0001437749-21-019894.txt | 2021-08-13 16:38:27 | |
 0001437749-21-019894-xbrl.zip | 97359 | 2021-08-13 16:38:27 |
| ex_260451.htm | 10568 | 2021-08-13 16:38:27 |
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| FilingSummary.xml | 25166 | 2021-08-13 16:38:27 |
| Financial_Report.xlsx | 45612 | 2021-08-13 16:38:27 |
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| npk-20210704.xsd | 32110 | 2021-08-13 16:38:27 |
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| npk-20210704_lab.xml | 195367 | 2021-08-13 16:38:27 |
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| npk20210704_10q.htm | 703141 | 2021-08-13 16:38:27 |
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| R9.htm | 7031 | 2021-08-13 16:38:27 |
| report.css | 2767 | 2021-08-13 16:38:27 |
| Show.js | 1085 | 2021-08-13 16:38:27 |