Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001437749-25-023664-index-headers.html | 2025-07-28 16:42:32 | |
| 0001437749-25-023664-index.html | 2025-07-28 16:42:32 | |
| 0001437749-25-023664.txt | 2025-07-28 16:42:32 | |
 0001437749-25-023664-xbrl.zip | 12685 | 2025-07-28 16:42:32 |
| ex_844563.htm | 23410 | 2025-07-28 16:42:32 |
| FilingSummary.xml | 1748 | 2025-07-28 16:42:32 |
| MetaLinks.json | 25294 | 2025-07-28 16:42:32 |
| npk-20250725.xsd | 3571 | 2025-07-28 16:42:32 |
| npk-20250725_def.xml | 11421 | 2025-07-28 16:42:32 |
| npk-20250725_lab.xml | 15310 | 2025-07-28 16:42:32 |
| npk-20250725_pre.xml | 11581 | 2025-07-28 16:42:32 |
| npk20250728_8k.htm | 27234 | 2025-07-28 16:42:32 |
| npk20250728_8k_htm.xml | 2849 | 2025-07-28 16:42:32 |
| R1.htm | 38336 | 2025-07-28 16:42:32 |
| report.css | 2767 | 2025-07-28 16:42:32 |
| Show.js | 1084 | 2025-07-28 16:42:32 |