Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001437749-25-007735-index-headers.html | 2025-03-14 16:19:18 | |
| 0001437749-25-007735-index.html | 2025-03-14 16:19:18 | |
| 0001437749-25-007735.txt | 2025-03-14 16:19:18 | |
 0001437749-25-007735-xbrl.zip | 206584 | 2025-03-14 16:19:18 |
| ex_752712.htm | 9052 | 2025-03-14 16:19:18 |
| ex_752713.htm | 3000 | 2025-03-14 16:19:18 |
| ex_752714.htm | 10830 | 2025-03-14 16:19:18 |
| ex_752715.htm | 10552 | 2025-03-14 16:19:18 |
| ex_752716.htm | 5343 | 2025-03-14 16:19:18 |
| ex_752717.htm | 5604 | 2025-03-14 16:19:18 |
| FilingSummary.xml | 49235 | 2025-03-14 16:19:18 |
| Financial_Report.xlsx | 98467 | 2025-03-14 16:19:18 |
| MetaLinks.json | 957656 | 2025-03-14 16:19:18 |
| npk-20241231.xsd | 66148 | 2025-03-14 16:19:18 |
| npk-20241231_cal.xml | 71940 | 2025-03-14 16:19:18 |
| npk-20241231_def.xml | 465558 | 2025-03-14 16:19:18 |
| npk-20241231_lab.xml | 429876 | 2025-03-14 16:19:18 |
| npk-20241231_pre.xml | 514022 | 2025-03-14 16:19:18 |
| npk20241231_10k.htm | 1412414 | 2025-03-14 16:19:18 |
| npk20241231_10k_htm.xml | 1426960 | 2025-03-14 16:19:18 |
| R1.htm | 68579 | 2025-03-14 16:19:18 |
| R10.htm | 97084 | 2025-03-14 16:19:18 |
| R11.htm | 15039 | 2025-03-14 16:19:18 |
| R12.htm | 7303 | 2025-03-14 16:19:18 |
| R13.htm | 5296 | 2025-03-14 16:19:18 |
| R14.htm | 5820 | 2025-03-14 16:19:18 |
| R15.htm | 30328 | 2025-03-14 16:19:18 |
| R16.htm | 9641 | 2025-03-14 16:19:18 |
| R17.htm | 87451 | 2025-03-14 16:19:18 |
| R18.htm | 6069 | 2025-03-14 16:19:18 |
| R19.htm | 9134 | 2025-03-14 16:19:18 |
| R2.htm | 136006 | 2025-03-14 16:19:18 |
| R20.htm | 18704 | 2025-03-14 16:19:18 |
| R21.htm | 80758 | 2025-03-14 16:19:18 |
| R22.htm | 35127 | 2025-03-14 16:19:18 |
| R23.htm | 40691 | 2025-03-14 16:19:18 |
| R24.htm | 12406 | 2025-03-14 16:19:18 |
| R25.htm | 38513 | 2025-03-14 16:19:18 |
| R26.htm | 5677 | 2025-03-14 16:19:18 |
| R27.htm | 7422 | 2025-03-14 16:19:18 |
| R28.htm | 58088 | 2025-03-14 16:19:18 |
| R29.htm | 133934 | 2025-03-14 16:19:18 |
| R3.htm | 12470 | 2025-03-14 16:19:18 |
| R30.htm | 69159 | 2025-03-14 16:19:18 |
| R31.htm | 11596 | 2025-03-14 16:19:18 |
| R32.htm | 24982 | 2025-03-14 16:19:18 |
| R33.htm | 85757 | 2025-03-14 16:19:18 |
| R34.htm | 11279 | 2025-03-14 16:19:18 |
| R35.htm | 65903 | 2025-03-14 16:19:18 |
| R36.htm | 33614 | 2025-03-14 16:19:18 |
| R37.htm | 38989 | 2025-03-14 16:19:18 |
| R38.htm | 32587 | 2025-03-14 16:19:18 |
| R39.htm | 55812 | 2025-03-14 16:19:18 |
| R4.htm | 78972 | 2025-03-14 16:19:18 |
| R40.htm | 85942 | 2025-03-14 16:19:18 |
| R41.htm | 11000 | 2025-03-14 16:19:18 |
| R42.htm | 16942 | 2025-03-14 16:19:18 |
| R43.htm | 16108 | 2025-03-14 16:19:18 |
| R44.htm | 21364 | 2025-03-14 16:19:18 |
| R45.htm | 8434 | 2025-03-14 16:19:18 |
| R46.htm | 6984 | 2025-03-14 16:19:18 |
| R47.htm | 14999 | 2025-03-14 16:19:18 |
| R48.htm | 7068 | 2025-03-14 16:19:18 |
| R49.htm | 15704 | 2025-03-14 16:19:18 |
| R5.htm | 103029 | 2025-03-14 16:19:18 |
| R50.htm | 4968 | 2025-03-14 16:19:18 |
| R51.htm | 30093 | 2025-03-14 16:19:18 |
| R52.htm | 22262 | 2025-03-14 16:19:18 |
| R53.htm | 14422 | 2025-03-14 16:19:18 |
| R54.htm | 7289 | 2025-03-14 16:19:18 |
| R55.htm | 21584 | 2025-03-14 16:19:18 |
| R56.htm | 23721 | 2025-03-14 16:19:18 |
| R57.htm | 31889 | 2025-03-14 16:19:18 |
| R58.htm | 15012 | 2025-03-14 16:19:18 |
| R59.htm | 13963 | 2025-03-14 16:19:18 |
| R6.htm | 41341 | 2025-03-14 16:19:18 |
| R60.htm | 6669 | 2025-03-14 16:19:18 |
| R61.htm | 17670 | 2025-03-14 16:19:18 |
| R62.htm | 16497 | 2025-03-14 16:19:18 |
| R63.htm | 79299 | 2025-03-14 16:19:18 |
| R64.htm | 12115 | 2025-03-14 16:19:18 |
| R65.htm | 7096 | 2025-03-14 16:19:18 |
| R66.htm | 18773 | 2025-03-14 16:19:18 |
| R67.htm | 14927 | 2025-03-14 16:19:18 |
| R68.htm | 39836 | 2025-03-14 16:19:18 |
| R69.htm | 19119 | 2025-03-14 16:19:18 |
| R7.htm | 4374 | 2025-03-14 16:19:18 |
| R70.htm | 32776 | 2025-03-14 16:19:18 |
| R71.htm | 34348 | 2025-03-14 16:19:18 |
| R72.htm | 10432 | 2025-03-14 16:19:18 |
| R73.htm | 2588 | 2025-03-14 16:19:18 |
| R74.htm | 9267 | 2025-03-14 16:19:18 |
| R75.htm | 19808 | 2025-03-14 16:19:18 |
| R8.htm | 11885 | 2025-03-14 16:19:18 |
| R9.htm | 30841 | 2025-03-14 16:19:18 |
| report.css | 2767 | 2025-03-14 16:19:18 |
| Show.js | 1085 | 2025-03-14 16:19:18 |