Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001213900-22-046332-index-headers.html | 2022-08-10 16:06:20 | |
| 0001213900-22-046332-index.html | 2022-08-10 16:06:20 | |
| 0001213900-22-046332.txt | 2022-08-10 16:06:20 | |
 0001213900-22-046332-xbrl.zip | 160184 | 2022-08-10 16:06:20 |
| ex311_1.htm | 9311 | 2022-08-10 16:06:20 |
| ex312_2.htm | 9348 | 2022-08-10 16:06:20 |
| ex321_3.htm | 6174 | 2022-08-10 16:06:20 |
| FilingSummary.xml | 24460 | 2022-08-10 16:06:20 |
| Financial_Report.xlsx | 67169 | 2022-08-10 16:06:20 |
| MetaLinks.json | 432434 | 2022-08-10 16:06:20 |
| nn-20220630.htm | 1724256 | 2022-08-10 16:06:20 |
| nn-20220630.xsd | 33475 | 2022-08-10 16:06:20 |
| nn-20220630_cal.xml | 66739 | 2022-08-10 16:06:20 |
| nn-20220630_def.xml | 112470 | 2022-08-10 16:06:20 |
| nn-20220630_htm.xml | 847084 | 2022-08-10 16:06:20 |
| nn-20220630_lab.xml | 522886 | 2022-08-10 16:06:20 |
| nn-20220630_pre.xml | 269316 | 2022-08-10 16:06:20 |
| R1.htm | 55527 | 2022-08-10 16:06:20 |
| R10.htm | 34457 | 2022-08-10 16:06:20 |
| R11.htm | 8758 | 2022-08-10 16:06:20 |
| R12.htm | 62175 | 2022-08-10 16:06:20 |
| R13.htm | 14525 | 2022-08-10 16:06:20 |
| R14.htm | 8992 | 2022-08-10 16:06:20 |
| R15.htm | 10922 | 2022-08-10 16:06:20 |
| R16.htm | 5681 | 2022-08-10 16:06:20 |
| R17.htm | 134454 | 2022-08-10 16:06:20 |
| R18.htm | 97149 | 2022-08-10 16:06:20 |
| R19.htm | 14143 | 2022-08-10 16:06:20 |
| R2.htm | 93258 | 2022-08-10 16:06:20 |
| R20.htm | 31540 | 2022-08-10 16:06:20 |
| R21.htm | 59547 | 2022-08-10 16:06:20 |
| R22.htm | 16592 | 2022-08-10 16:06:20 |
| R23.htm | 15022 | 2022-08-10 16:06:20 |
| R24.htm | 12540 | 2022-08-10 16:06:20 |
| R25.htm | 43388 | 2022-08-10 16:06:20 |
| R26.htm | 17351 | 2022-08-10 16:06:20 |
| R27.htm | 10625 | 2022-08-10 16:06:20 |
| R28.htm | 13122 | 2022-08-10 16:06:20 |
| R29.htm | 13767 | 2022-08-10 16:06:20 |
| R3.htm | 13590 | 2022-08-10 16:06:20 |
| R30.htm | 35168 | 2022-08-10 16:06:20 |
| R31.htm | 16317 | 2022-08-10 16:06:20 |
| R32.htm | 24136 | 2022-08-10 16:06:20 |
| R33.htm | 16254 | 2022-08-10 16:06:20 |
| R34.htm | 6524 | 2022-08-10 16:06:20 |
| R35.htm | 35498 | 2022-08-10 16:06:20 |
| R36.htm | 12985 | 2022-08-10 16:06:20 |
| R37.htm | 12251 | 2022-08-10 16:06:20 |
| R4.htm | 90548 | 2022-08-10 16:06:20 |
| R5.htm | 127149 | 2022-08-10 16:06:20 |
| R6.htm | 85476 | 2022-08-10 16:06:20 |
| R7.htm | 9009 | 2022-08-10 16:06:20 |
| R8.htm | 113995 | 2022-08-10 16:06:20 |
| R9.htm | 15000 | 2022-08-10 16:06:20 |
| report.css | 2767 | 2022-08-10 16:06:20 |
| Show.js | 1085 | 2022-08-10 16:06:20 |