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| 0001437749-21-026462-index.html | 2021-11-12 16:02:37 | |
| 0001437749-21-026462.txt | 2021-11-12 16:02:37 | |
 0001437749-21-026462-xbrl.zip | 92876 | 2021-11-12 16:02:37 |
| ex_284714.htm | 10570 | 2021-11-12 16:02:37 |
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| Financial_Report.xlsx | 40550 | 2021-11-12 16:02:37 |
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| npk-20211003.xsd | 27137 | 2021-11-12 16:02:37 |
| npk-20211003_cal.xml | 38082 | 2021-11-12 16:02:37 |
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| npk-20211003_lab.xml | 182451 | 2021-11-12 16:02:37 |
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| npk20210916_10q.htm | 701694 | 2021-11-12 16:02:37 |
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| R1.htm | 52435 | 2021-11-12 16:02:37 |
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| R8.htm | 5855 | 2021-11-12 16:02:37 |
| R9.htm | 7071 | 2021-11-12 16:02:37 |
| report.css | 2767 | 2021-11-12 16:02:37 |
| Show.js | 1085 | 2021-11-12 16:02:37 |