Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001437749-26-012242-index-headers.html | 2026-04-14 16:15:54 | |
| 0001437749-26-012242-index.html | 2026-04-14 16:15:54 | |
| 0001437749-26-012242.txt | 2026-04-14 16:15:54 | |
 0001437749-26-012242-xbrl.zip | 508971 | 2026-04-14 16:15:54 |
| FilingSummary.xml | 4088 | 2026-04-14 16:15:54 |
 graph01.jpg | 74404 | 2026-04-14 16:15:54 |
 graph02.jpg | 76027 | 2026-04-14 16:15:54 |
 logo.jpg | 15638 | 2026-04-14 16:15:54 |
| MetaLinks.json | 209823 | 2026-04-14 16:15:54 |
| npk-20251231.xsd | 4568 | 2026-04-14 16:15:54 |
| npk-20251231_def.xml | 1750 | 2026-04-14 16:15:54 |
| npk-20251231_lab.xml | 1775 | 2026-04-14 16:15:54 |
| npk-20251231_pre.xml | 1004 | 2026-04-14 16:15:54 |
| npk20260403_def14a.htm | 421168 | 2026-04-14 16:15:54 |
| npk20260403_def14a_htm.xml | 64718 | 2026-04-14 16:15:54 |
 npkpx01.jpg | 218409 | 2026-04-14 16:15:54 |
 npkpx02.jpg | 149630 | 2026-04-14 16:15:54 |
| R1.htm | 10840 | 2026-04-14 16:15:54 |
| R2.htm | 81886 | 2026-04-14 16:15:54 |
| R3.htm | 6531 | 2026-04-14 16:15:54 |
| R4.htm | 11408 | 2026-04-14 16:15:54 |
| R5.htm | 4370 | 2026-04-14 16:15:54 |
| report.css | 2767 | 2026-04-14 16:15:54 |
| Show.js | 1085 | 2026-04-14 16:15:54 |
 sig01.jpg | 12986 | 2026-04-14 16:15:54 |