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 0001562762-19-000316-index-headers.html | 2019-11-22 16:03:31 | |
| 0001562762-19-000316-index.html | 2019-11-22 16:03:31 | |
| 0001562762-19-000316.txt | 2019-11-22 16:03:31 | |
 0001562762-19-000316-xbrl.zip | 76588 | 2019-11-22 16:03:31 |
| FilingSummary.xml | 25178 | 2019-11-22 16:03:31 |
| Financial_Report.xlsx | 44982 | 2019-11-22 16:03:31 |
| npk-20190630.xml | 843080 | 2019-11-22 16:03:31 |
| npk-20190630.xsd | 26454 | 2019-11-22 16:03:31 |
| npk-20190630x10q.htm | 1100080 | 2019-11-22 16:03:31 |
| npk-20190630xex31_1.htm | 15367 | 2019-11-22 16:03:31 |
| npk-20190630xex31_2.htm | 15574 | 2019-11-22 16:03:31 |
| npk-20190630xex32_1.htm | 8937 | 2019-11-22 16:03:31 |
| npk-20190630xex32_2.htm | 8978 | 2019-11-22 16:03:31 |
| npk-20190630_cal.xml | 58161 | 2019-11-22 16:03:31 |
| npk-20190630_def.xml | 77815 | 2019-11-22 16:03:31 |
| npk-20190630_lab.xml | 224046 | 2019-11-22 16:03:31 |
| npk-20190630_pre.xml | 199608 | 2019-11-22 16:03:31 |
| R1.htm | 23454 | 2019-11-22 16:03:31 |
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| R8.htm | 7660 | 2019-11-22 16:03:31 |
| R9.htm | 5054 | 2019-11-22 16:03:31 |
| report.css | 2767 | 2019-11-22 16:03:31 |
| Show.js | 1085 | 2019-11-22 16:03:31 |