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| 0001437749-19-009064-index.html | 2019-05-08 12:08:00 | |
| 0001437749-19-009064.txt | 2019-05-08 12:08:00 | |
 0001437749-19-009064-xbrl.zip | 126919 | 2019-05-08 12:08:00 |
| ex_142626.htm | 14593 | 2019-05-08 12:08:00 |
| ex_142627.htm | 14837 | 2019-05-08 12:08:00 |
| ex_142628.htm | 9612 | 2019-05-08 12:08:00 |
| FilingSummary.xml | 36009 | 2019-05-08 12:08:00 |
| Financial_Report.xlsx | 60088 | 2019-05-08 12:08:00 |
| nrc-20190331.xml | 1052135 | 2019-05-08 12:08:00 |
| nrc-20190331.xsd | 54240 | 2019-05-08 12:08:00 |
| nrc-20190331_cal.xml | 52553 | 2019-05-08 12:08:00 |
| nrc-20190331_def.xml | 389260 | 2019-05-08 12:08:00 |
| nrc-20190331_lab.xml | 360239 | 2019-05-08 12:08:00 |
| nrc-20190331_pre.xml | 421486 | 2019-05-08 12:08:00 |
| nrc20190331_10q.htm | 852950 | 2019-05-08 12:08:00 |
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| report.css | 2767 | 2019-05-08 12:08:00 |
| Show.js | 1085 | 2019-05-08 12:08:00 |