Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001437749-25-015772-index-headers.html | 2025-05-09 16:02:45 | |
| 0001437749-25-015772-index.html | 2025-05-09 16:02:45 | |
| 0001437749-25-015772.txt | 2025-05-09 16:02:45 | |
 0001437749-25-015772-xbrl.zip | 89730 | 2025-05-09 16:02:45 |
| ex_799793.htm | 10564 | 2025-05-09 16:02:45 |
| ex_799794.htm | 10749 | 2025-05-09 16:02:45 |
| ex_799795.htm | 5178 | 2025-05-09 16:02:45 |
| ex_799796.htm | 5219 | 2025-05-09 16:02:45 |
| FilingSummary.xml | 23254 | 2025-05-09 16:02:45 |
| Financial_Report.xlsx | 43889 | 2025-05-09 16:02:45 |
| MetaLinks.json | 538856 | 2025-05-09 16:02:45 |
| npk-20250330.xsd | 29195 | 2025-05-09 16:02:45 |
| npk-20250330_cal.xml | 37200 | 2025-05-09 16:02:45 |
| npk-20250330_def.xml | 200693 | 2025-05-09 16:02:45 |
| npk-20250330_lab.xml | 189108 | 2025-05-09 16:02:45 |
| npk-20250330_pre.xml | 225194 | 2025-05-09 16:02:45 |
| npk20250331_10q.htm | 580890 | 2025-05-09 16:02:45 |
| npk20250331_10q_htm.xml | 386973 | 2025-05-09 16:02:45 |
| R1.htm | 51780 | 2025-05-09 16:02:45 |
| R10.htm | 5631 | 2025-05-09 16:02:45 |
| R11.htm | 68025 | 2025-05-09 16:02:45 |
| R12.htm | 11276 | 2025-05-09 16:02:45 |
| R13.htm | 27992 | 2025-05-09 16:02:45 |
| R14.htm | 5137 | 2025-05-09 16:02:45 |
| R15.htm | 32043 | 2025-05-09 16:02:45 |
| R16.htm | 6216 | 2025-05-09 16:02:45 |
| R17.htm | 12560 | 2025-05-09 16:02:45 |
| R18.htm | 14557 | 2025-05-09 16:02:45 |
| R19.htm | 6212 | 2025-05-09 16:02:45 |
| R2.htm | 126065 | 2025-05-09 16:02:45 |
| R20.htm | 11477 | 2025-05-09 16:02:45 |
| R21.htm | 53689 | 2025-05-09 16:02:45 |
| R22.htm | 23823 | 2025-05-09 16:02:45 |
| R23.htm | 30776 | 2025-05-09 16:02:45 |
| R24.htm | 15869 | 2025-05-09 16:02:45 |
| R25.htm | 7880 | 2025-05-09 16:02:45 |
| R26.htm | 6744 | 2025-05-09 16:02:45 |
| R27.htm | 69828 | 2025-05-09 16:02:45 |
| R28.htm | 17928 | 2025-05-09 16:02:45 |
| R29.htm | 16502 | 2025-05-09 16:02:45 |
| R3.htm | 7130 | 2025-05-09 16:02:45 |
| R30.htm | 3981 | 2025-05-09 16:02:45 |
| R31.htm | 9972 | 2025-05-09 16:02:45 |
| R32.htm | 6896 | 2025-05-09 16:02:45 |
| R33.htm | 22568 | 2025-05-09 16:02:45 |
| R34.htm | 14730 | 2025-05-09 16:02:45 |
| R35.htm | 16785 | 2025-05-09 16:02:45 |
| R36.htm | 5690 | 2025-05-09 16:02:45 |
| R4.htm | 90726 | 2025-05-09 16:02:45 |
| R5.htm | 85288 | 2025-05-09 16:02:45 |
| R6.htm | 39413 | 2025-05-09 16:02:45 |
| R7.htm | 4233 | 2025-05-09 16:02:45 |
| R8.htm | 6857 | 2025-05-09 16:02:45 |
| R9.htm | 14520 | 2025-05-09 16:02:45 |
| report.css | 2767 | 2025-05-09 16:02:45 |
| Show.js | 1085 | 2025-05-09 16:02:45 |