Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000897101-21-000270-index-headers.html | 2021-04-01 16:15:37 | |
| 0000897101-21-000270-index.html | 2021-04-01 16:15:37 | |
| 0000897101-21-000270.txt | 2021-04-01 16:15:37 | |
 0000897101-21-000270-xbrl.zip | 12906 | 2021-04-01 16:15:37 |
| FilingSummary.xml | 1632 | 2021-04-01 16:15:37 |
| Financial_Report.xlsx | 5658 | 2021-04-01 16:15:37 |
| MetaLinks.json | 37478 | 2021-04-01 16:15:37 |
| npk-20210330.xsd | 2726 | 2021-04-01 16:15:37 |
| npk-20210330_lab.xml | 34591 | 2021-04-01 16:15:37 |
| npk-20210330_pre.xml | 22691 | 2021-04-01 16:15:37 |
| presto210494_8k.htm | 28010 | 2021-04-01 16:15:37 |
| presto210494_8k_htm.xml | 3495 | 2021-04-01 16:15:37 |
| presto210494_ex99-1.htm | 3576 | 2021-04-01 16:15:37 |
| R1.htm | 38610 | 2021-04-01 16:15:37 |
| report.css | 2767 | 2021-04-01 16:15:37 |
| Show.js | 1084 | 2021-04-01 16:15:37 |