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| 0001437749-23-014213.txt | 2023-05-12 16:01:25 | |
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| ex_500536.htm | 10565 | 2023-05-12 16:01:25 |
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| ex_500538.htm | 5178 | 2023-05-12 16:01:25 |
| ex_500539.htm | 5219 | 2023-05-12 16:01:25 |
| FilingSummary.xml | 25737 | 2023-05-12 16:01:25 |
| Financial_Report.xlsx | 47411 | 2023-05-12 16:01:25 |
| MetaLinks.json | 508851 | 2023-05-12 16:01:25 |
| npk-20230402.xsd | 32941 | 2023-05-12 16:01:25 |
| npk-20230402_cal.xml | 44873 | 2023-05-12 16:01:25 |
| npk-20230402_def.xml | 232218 | 2023-05-12 16:01:25 |
| npk-20230402_lab.xml | 213254 | 2023-05-12 16:01:25 |
| npk-20230402_pre.xml | 254649 | 2023-05-12 16:01:25 |
| npk20230413_10q.htm | 590159 | 2023-05-12 16:01:25 |
| npk20230413_10q_htm.xml | 436518 | 2023-05-12 16:01:25 |
| R1.htm | 51798 | 2023-05-12 16:01:25 |
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| report.css | 2767 | 2023-05-12 16:01:25 |
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