Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000080172-16-000064-index-headers.html | 2016-08-12 16:01:36 | |
| 0000080172-16-000064-index.html | 2016-08-12 16:01:36 | |
| 0000080172-16-000064.txt | 2016-08-12 16:01:36 | |
 0000080172-16-000064-xbrl.zip | 46544 | 2016-08-12 16:01:36 |
| FilingSummary.xml | 13008 | 2016-08-12 16:01:36 |
| Financial_Report.xlsx | 27406 | 2016-08-12 16:01:36 |
| npk-20160703.xml | 615536 | 2016-08-12 16:01:36 |
| npk-20160703.xsd | 14606 | 2016-08-12 16:01:36 |
| npk-20160703x10q.htm | 895617 | 2016-08-12 16:01:36 |
| npk-20160703xex31_1.htm | 15340 | 2016-08-12 16:01:36 |
| npk-20160703xex31_2.htm | 15621 | 2016-08-12 16:01:36 |
| npk-20160703xex32_1.htm | 8640 | 2016-08-12 16:01:36 |
| npk-20160703xex32_2.htm | 8903 | 2016-08-12 16:01:36 |
| npk-20160703_cal.xml | 38248 | 2016-08-12 16:01:36 |
| npk-20160703_def.xml | 27262 | 2016-08-12 16:01:36 |
| npk-20160703_lab.xml | 130530 | 2016-08-12 16:01:36 |
| npk-20160703_pre.xml | 104256 | 2016-08-12 16:01:36 |
| R1.htm | 20398 | 2016-08-12 16:01:36 |
| R10.htm | 9466 | 2016-08-12 16:01:36 |
| R11.htm | 71133 | 2016-08-12 16:01:36 |
| R12.htm | 5894 | 2016-08-12 16:01:36 |
| R13.htm | 6177 | 2016-08-12 16:01:36 |
| R14.htm | 14507 | 2016-08-12 16:01:36 |
| R15.htm | 181873 | 2016-08-12 16:01:36 |
| R16.htm | 63129 | 2016-08-12 16:01:36 |
| R17.htm | 29991 | 2016-08-12 16:01:36 |
| R18.htm | 29633 | 2016-08-12 16:01:36 |
| R19.htm | 17329 | 2016-08-12 16:01:36 |
| R2.htm | 88422 | 2016-08-12 16:01:36 |
| R20.htm | 8348 | 2016-08-12 16:01:36 |
| R3.htm | 9042 | 2016-08-12 16:01:36 |
| R4.htm | 44026 | 2016-08-12 16:01:36 |
| R5.htm | 66711 | 2016-08-12 16:01:36 |
| R6.htm | 6988 | 2016-08-12 16:01:36 |
| R7.htm | 5406 | 2016-08-12 16:01:36 |
| R8.htm | 6374 | 2016-08-12 16:01:36 |
| R9.htm | 185698 | 2016-08-12 16:01:36 |
| report.css | 2767 | 2016-08-12 16:01:36 |
| Show.js | 1410 | 2016-08-12 16:01:36 |