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| 0001437749-24-034199-index.html | 2024-11-08 16:00:58 | |
| 0001437749-24-034199.txt | 2024-11-08 16:00:58 | |
 0001437749-24-034199-xbrl.zip | 92427 | 2024-11-08 16:00:58 |
| ex_717877.htm | 10569 | 2024-11-08 16:00:58 |
| ex_717878.htm | 10754 | 2024-11-08 16:00:58 |
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| ex_717880.htm | 5229 | 2024-11-08 16:00:58 |
| FilingSummary.xml | 21895 | 2024-11-08 16:00:58 |
| Financial_Report.xlsx | 43871 | 2024-11-08 16:00:58 |
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| npk-20240929.xsd | 27198 | 2024-11-08 16:00:58 |
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| npk-20240929_lab.xml | 178379 | 2024-11-08 16:00:58 |
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| npk20240930_10q.htm | 745313 | 2024-11-08 16:00:58 |
| npk20240930_10q_htm.xml | 510786 | 2024-11-08 16:00:58 |
| R1.htm | 51795 | 2024-11-08 16:00:58 |
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| R9.htm | 15094 | 2024-11-08 16:00:58 |
| report.css | 2767 | 2024-11-08 16:00:58 |
| Show.js | 1085 | 2024-11-08 16:00:58 |