Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001437749-25-025717-index-headers.html | 2025-08-08 16:05:55 | |
| 0001437749-25-025717-index.html | 2025-08-08 16:05:55 | |
| 0001437749-25-025717.txt | 2025-08-08 16:05:55 | |
 0001437749-25-025717-xbrl.zip | 98833 | 2025-08-08 16:05:55 |
| ex_829492.htm | 10630 | 2025-08-08 16:05:55 |
| ex_829493.htm | 10815 | 2025-08-08 16:05:55 |
| ex_829494.htm | 5244 | 2025-08-08 16:05:55 |
| ex_829495.htm | 5285 | 2025-08-08 16:05:55 |
| FilingSummary.xml | 24529 | 2025-08-08 16:05:55 |
| MetaLinks.json | 553785 | 2025-08-08 16:05:55 |
| npk-20250629.xsd | 30683 | 2025-08-08 16:05:55 |
| npk-20250629_cal.xml | 38144 | 2025-08-08 16:05:55 |
| npk-20250629_def.xml | 216148 | 2025-08-08 16:05:55 |
| npk-20250629_lab.xml | 198682 | 2025-08-08 16:05:55 |
| npk-20250629_pre.xml | 243117 | 2025-08-08 16:05:55 |
| npk20250630_10q.htm | 779514 | 2025-08-08 16:05:55 |
| npk20250630_10q_htm.xml | 576411 | 2025-08-08 16:05:55 |
| R1.htm | 51781 | 2025-08-08 16:05:55 |
| R10.htm | 5631 | 2025-08-08 16:05:55 |
| R11.htm | 118791 | 2025-08-08 16:05:55 |
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| R18.htm | 5529 | 2025-08-08 16:05:55 |
| R19.htm | 14575 | 2025-08-08 16:05:55 |
| R2.htm | 133011 | 2025-08-08 16:05:55 |
| R20.htm | 6770 | 2025-08-08 16:05:55 |
| R21.htm | 11828 | 2025-08-08 16:05:55 |
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| R24.htm | 36532 | 2025-08-08 16:05:55 |
| R25.htm | 15869 | 2025-08-08 16:05:55 |
| R26.htm | 7880 | 2025-08-08 16:05:55 |
| R27.htm | 6744 | 2025-08-08 16:05:55 |
| R28.htm | 82747 | 2025-08-08 16:05:55 |
| R29.htm | 18691 | 2025-08-08 16:05:55 |
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| R37.htm | 3179 | 2025-08-08 16:05:55 |
| R38.htm | 11433 | 2025-08-08 16:05:55 |
| R4.htm | 94194 | 2025-08-08 16:05:55 |
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| R6.htm | 50777 | 2025-08-08 16:05:55 |
| R7.htm | 4197 | 2025-08-08 16:05:55 |
| R8.htm | 6857 | 2025-08-08 16:05:55 |
| R9.htm | 14626 | 2025-08-08 16:05:55 |
| report.css | 2767 | 2025-08-08 16:05:55 |
| Show.js | 1085 | 2025-08-08 16:05:55 |