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|---|---|---|
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| 0000080172-16-000072-index.html | 2016-11-14 16:06:17 | |
| 0000080172-16-000072.txt | 2016-11-14 16:06:17 | |
 0000080172-16-000072-xbrl.zip | 47464 | 2016-11-14 16:06:17 |
| FilingSummary.xml | 13008 | 2016-11-14 16:06:17 |
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| npk-20161002xex31_1.htm | 15345 | 2016-11-14 16:06:17 |
| npk-20161002xex31_2.htm | 15626 | 2016-11-14 16:06:17 |
| npk-20161002xex32_1.htm | 8785 | 2016-11-14 16:06:17 |
| npk-20161002xex32_2.htm | 9048 | 2016-11-14 16:06:17 |
| npk-20161002_cal.xml | 39406 | 2016-11-14 16:06:17 |
| npk-20161002_def.xml | 27266 | 2016-11-14 16:06:17 |
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| R10.htm | 9466 | 2016-11-14 16:06:17 |
| R11.htm | 71154 | 2016-11-14 16:06:17 |
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| R8.htm | 6376 | 2016-11-14 16:06:17 |
| R9.htm | 185852 | 2016-11-14 16:06:17 |
| report.css | 2767 | 2016-11-14 16:06:17 |
| Show.js | 1410 | 2016-11-14 16:06:17 |