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| 0000086115-18-000044-index.html | 2018-04-26 14:51:04 | |
| 0000086115-18-000044.txt | 2018-04-26 14:51:04 | |
 0000086115-18-000044-xbrl.zip | 125546 | 2018-04-26 14:51:04 |
| FilingSummary.xml | 26067 | 2018-04-26 14:51:04 |
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| R9.htm | 38750 | 2018-04-26 14:51:04 |
| report.css | 2767 | 2018-04-26 14:51:04 |
| sfe-20180331.xml | 555434 | 2018-04-26 14:51:04 |
| sfe-20180331.xsd | 39783 | 2018-04-26 14:51:04 |
| sfe-20180331_cal.xml | 46510 | 2018-04-26 14:51:04 |
| sfe-20180331_def.xml | 182239 | 2018-04-26 14:51:04 |
| sfe-20180331_lab.xml | 463417 | 2018-04-26 14:51:04 |
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| sfe-2018xq1.htm | 618104 | 2018-04-26 14:51:04 |
| sfe-2018xq1xex311.htm | 22947 | 2018-04-26 14:51:04 |
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| sfe-2018xq1xex321.htm | 8941 | 2018-04-26 14:51:04 |
| sfe-2018xq1xex322.htm | 8968 | 2018-04-26 14:51:04 |
| Show.js | 1410 | 2018-04-26 14:51:04 |