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| 0000897101-15-000673-index.html | 2015-05-15 16:06:20 | |
| 0000897101-15-000673.txt | 2015-05-15 16:06:20 | |
 0000897101-15-000673-xbrl.zip | 46632 | 2015-05-15 16:06:20 |
| FilingSummary.xml | 12680 | 2015-05-15 16:06:20 |
| Financial_Report.xls | 437527 | 2015-05-15 16:06:20 |
| Financial_Report.xlsx | 49074 | 2015-05-15 16:06:20 |
| npk-20150405.xml | 458812 | 2015-05-15 16:06:20 |
| npk-20150405.xsd | 16438 | 2015-05-15 16:06:20 |
| npk-20150405_cal.xml | 43192 | 2015-05-15 16:06:20 |
| npk-20150405_def.xml | 39584 | 2015-05-15 16:06:20 |
| npk-20150405_lab.xml | 147940 | 2015-05-15 16:06:20 |
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| presto151746_10q.htm | 511388 | 2015-05-15 16:06:20 |
| presto151746_ex31-1.htm | 10335 | 2015-05-15 16:06:20 |
| presto151746_ex31-2.htm | 10215 | 2015-05-15 16:06:20 |
| presto151746_ex32-1.htm | 4602 | 2015-05-15 16:06:20 |
| presto151746_ex32-2.htm | 5052 | 2015-05-15 16:06:20 |
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| R9.htm | 100324 | 2015-05-15 16:06:20 |
| report.css | 2740 | 2015-05-15 16:06:20 |
| Show.js | 1410 | 2015-05-15 16:06:20 |