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| 0000897101-15-001096-index.html | 2015-08-14 16:05:44 | |
| 0000897101-15-001096.txt | 2015-08-14 16:05:44 | |
 0000897101-15-001096-xbrl.zip | 55109 | 2015-08-14 16:05:44 |
| FilingSummary.xml | 16019 | 2015-08-14 16:05:44 |
| Financial_Report.xlsx | 30746 | 2015-08-14 16:05:44 |
| npk-20150705.xml | 797428 | 2015-08-14 16:05:44 |
| npk-20150705.xsd | 17480 | 2015-08-14 16:05:44 |
| npk-20150705_cal.xml | 43640 | 2015-08-14 16:05:44 |
| npk-20150705_def.xml | 44604 | 2015-08-14 16:05:44 |
| npk-20150705_lab.xml | 153856 | 2015-08-14 16:05:44 |
| npk-20150705_pre.xml | 128158 | 2015-08-14 16:05:44 |
| presto152846_10q.htm | 275276 | 2015-08-14 16:05:44 |
| presto152846_ex31-1.htm | 10276 | 2015-08-14 16:05:44 |
| presto152846_ex31-2.htm | 10303 | 2015-08-14 16:05:44 |
| presto152846_ex32-1.htm | 4881 | 2015-08-14 16:05:44 |
| presto152846_ex32-2.htm | 4950 | 2015-08-14 16:05:44 |
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| R9.htm | 185384 | 2015-08-14 16:05:44 |
| report.css | 2767 | 2015-08-14 16:05:44 |
| Show.js | 1410 | 2015-08-14 16:05:44 |