Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000897101-23-000147-index-headers.html | 2023-04-11 07:00:31 | |
| 0000897101-23-000147-index.html | 2023-04-11 07:00:31 | |
| 0000897101-23-000147.txt | 2023-04-11 07:00:31 | |
 0000897101-23-000147-xbrl.zip | 436256 | 2023-04-11 07:00:31 |
 a230354001_v1.jpg | 10805 | 2023-04-11 07:00:31 |
 a230354002_v1.jpg | 11067 | 2023-04-11 07:00:31 |
 a230354003_v1.jpg | 86736 | 2023-04-11 07:00:31 |
 a230354004_v1.jpg | 51569 | 2023-04-11 07:00:31 |
 a230354005_v1.jpg | 175218 | 2023-04-11 07:00:31 |
 a230354006_v1.jpg | 119477 | 2023-04-11 07:00:31 |
| FilingSummary.xml | 2526 | 2023-04-11 07:00:31 |
| Financial_Report.xlsx | 9849 | 2023-04-11 07:00:31 |
| MetaLinks.json | 58199 | 2023-04-11 07:00:31 |
| npk-20221231.xsd | 3926 | 2023-04-11 07:00:31 |
| npk-20221231_def.xml | 6637 | 2023-04-11 07:00:31 |
| npk-20221231_lab.xml | 8044 | 2023-04-11 07:00:31 |
| npk-20221231_pre.xml | 26794 | 2023-04-11 07:00:31 |
| npk230354_def14a.htm | 265515 | 2023-04-11 07:00:31 |
| npk230354_def14a_htm.xml | 65467 | 2023-04-11 07:00:31 |
| R1.htm | 8935 | 2023-04-11 07:00:31 |
| R2.htm | 102090 | 2023-04-11 07:00:31 |
| report.css | 2767 | 2023-04-11 07:00:31 |
| Show.js | 1085 | 2023-04-11 07:00:31 |