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| 0000789933-20-000043-index.html | 2020-08-05 17:05:09 | |
| 0000789933-20-000043.txt | 2020-08-05 17:05:09 | |
 0000789933-20-000043-xbrl.zip | 185147 | 2020-08-05 17:05:09 |
| exhibit311q220.htm | 14740 | 2020-08-05 17:05:09 |
| exhibit312q220.htm | 14733 | 2020-08-05 17:05:09 |
| exhibit32q220.htm | 11412 | 2020-08-05 17:05:09 |
| exhibit95q220.htm | 120728 | 2020-08-05 17:05:09 |
| FilingSummary.xml | 26576 | 2020-08-05 17:05:09 |
| Financial_Report.xlsx | 64337 | 2020-08-05 17:05:09 |
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| nacco-20200630.xsd | 30207 | 2020-08-05 17:05:09 |
| nacco-20200630_cal.xml | 79274 | 2020-08-05 17:05:09 |
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| nacco-20200630_lab.xml | 410399 | 2020-08-05 17:05:09 |
| nacco-20200630_pre.xml | 242187 | 2020-08-05 17:05:09 |
| nc630202010-q.htm | 1455996 | 2020-08-05 17:05:09 |
| nc630202010-q_htm.xml | 1169863 | 2020-08-05 17:05:09 |
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| R9.htm | 4788 | 2020-08-05 17:05:09 |
| report.css | 2767 | 2020-08-05 17:05:09 |
| Show.js | 1085 | 2020-08-05 17:05:09 |