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| 0000789933-20-000028-index.html | 2020-05-07 17:08:57 | |
| 0000789933-20-000028.txt | 2020-05-07 17:08:57 | |
 0000789933-20-000028-xbrl.zip | 125891 | 2020-05-07 17:08:57 |
| exhibit311q120.htm | 14737 | 2020-05-07 17:08:57 |
| exhibit312q120.htm | 14730 | 2020-05-07 17:08:57 |
| exhibit32q120.htm | 11407 | 2020-05-07 17:08:57 |
| exhibit95q120.htm | 120721 | 2020-05-07 17:08:57 |
| FilingSummary.xml | 26494 | 2020-05-07 17:08:57 |
| Financial_Report.xlsx | 50882 | 2020-05-07 17:08:57 |
| nacco-20200331.xml | 861174 | 2020-05-07 17:08:57 |
| nacco-20200331.xsd | 31081 | 2020-05-07 17:08:57 |
| nacco-20200331_cal.xml | 78566 | 2020-05-07 17:08:57 |
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| nacco-20200331_lab.xml | 385044 | 2020-05-07 17:08:57 |
| nacco-20200331_pre.xml | 227539 | 2020-05-07 17:08:57 |
| nc331202010-q.htm | 859040 | 2020-05-07 17:08:57 |
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| R9.htm | 4516 | 2020-05-07 17:08:57 |
| report.css | 2767 | 2020-05-07 17:08:57 |
| Show.js | 1085 | 2020-05-07 17:08:57 |