Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0001434842-20-000003-index-headers.html | 2020-03-23 09:43:35 | |
| 0001434842-20-000003-index.html | 2020-03-23 09:43:35 | |
| 0001434842-20-000003.txt | 2020-03-23 09:43:35 | |
 0001434842-20-000003-xbrl.zip | 254291 | 2020-03-23 09:43:35 |
| a10k2019.htm | 1427304 | 2020-03-23 09:43:35 |
 chart-860cfd296e37573e97b.jpg | 40771 | 2020-03-23 09:43:35 |
 chart-dc4ed9ad2e2650e7b5a.jpg | 48760 | 2020-03-23 09:43:35 |
 chart-def180a252ae518f8f1.jpg | 58079 | 2020-03-23 09:43:35 |
| ex1018201910k.htm | 1001436 | 2020-03-23 09:43:35 |
| ex1019201910k.htm | 1285453 | 2020-03-23 09:43:35 |
| ex1020201910k.htm | 1262799 | 2020-03-23 09:43:35 |
| ex1021201910k.htm | 1281008 | 2020-03-23 09:43:35 |
| ex1022201910k.htm | 37859 | 2020-03-23 09:43:35 |
| ex211201910k.htm | 7054 | 2020-03-23 09:43:35 |
| ex231201910k.htm | 3262 | 2020-03-23 09:43:35 |
| ex311201910k.htm | 14355 | 2020-03-23 09:43:35 |
| ex312201910k.htm | 14361 | 2020-03-23 09:43:35 |
| ex321201910k.htm | 8002 | 2020-03-23 09:43:35 |
| ex322201910k.htm | 8059 | 2020-03-23 09:43:35 |
| ex43201910k.htm | 31882 | 2020-03-23 09:43:35 |
| fes-20191231.xml | 1846298 | 2020-03-23 09:43:35 |
| fes-20191231.xsd | 61108 | 2020-03-23 09:43:35 |
| fes-20191231_cal.xml | 123364 | 2020-03-23 09:43:35 |
| fes-20191231_def.xml | 295083 | 2020-03-23 09:43:35 |
| fes-20191231_lab.xml | 834487 | 2020-03-23 09:43:35 |
| fes-20191231_pre.xml | 490010 | 2020-03-23 09:43:35 |
| FilingSummary.xml | 46962 | 2020-03-23 09:43:35 |
| Financial_Report.xlsx | 103158 | 2020-03-23 09:43:35 |
| R1.htm | 34036 | 2020-03-23 09:43:35 |
| R10.htm | 66061 | 2020-03-23 09:43:35 |
| R11.htm | 16105 | 2020-03-23 09:43:35 |
| R12.htm | 57870 | 2020-03-23 09:43:35 |
| R13.htm | 31757 | 2020-03-23 09:43:35 |
| R14.htm | 17323 | 2020-03-23 09:43:35 |
| R15.htm | 51717 | 2020-03-23 09:43:35 |
| R16.htm | 16322 | 2020-03-23 09:43:35 |
| R17.htm | 188795 | 2020-03-23 09:43:35 |
| R18.htm | 17232 | 2020-03-23 09:43:35 |
| R19.htm | 8196 | 2020-03-23 09:43:35 |
| R2.htm | 75597 | 2020-03-23 09:43:35 |
| R20.htm | 14435 | 2020-03-23 09:43:35 |
| R21.htm | 101798 | 2020-03-23 09:43:35 |
| R22.htm | 55591 | 2020-03-23 09:43:35 |
| R23.htm | 83077 | 2020-03-23 09:43:35 |
| R24.htm | 30083 | 2020-03-23 09:43:35 |
| R25.htm | 9355 | 2020-03-23 09:43:35 |
| R26.htm | 16765 | 2020-03-23 09:43:35 |
| R27.htm | 79868 | 2020-03-23 09:43:35 |
| R28.htm | 38850 | 2020-03-23 09:43:35 |
| R29.htm | 11673 | 2020-03-23 09:43:35 |
| R3.htm | 10762 | 2020-03-23 09:43:35 |
| R30.htm | 58396 | 2020-03-23 09:43:35 |
| R31.htm | 29876 | 2020-03-23 09:43:35 |
| R32.htm | 17339 | 2020-03-23 09:43:35 |
| R33.htm | 24726 | 2020-03-23 09:43:35 |
| R34.htm | 176001 | 2020-03-23 09:43:35 |
| R35.htm | 16534 | 2020-03-23 09:43:35 |
| R36.htm | 13713 | 2020-03-23 09:43:35 |
| R37.htm | 100907 | 2020-03-23 09:43:35 |
| R38.htm | 55152 | 2020-03-23 09:43:35 |
| R39.htm | 81731 | 2020-03-23 09:43:35 |
| R4.htm | 50157 | 2020-03-23 09:43:35 |
| R40.htm | 24716 | 2020-03-23 09:43:35 |
| R41.htm | 13473 | 2020-03-23 09:43:35 |
| R42.htm | 13304 | 2020-03-23 09:43:35 |
| R43.htm | 11982 | 2020-03-23 09:43:35 |
| R44.htm | 10152 | 2020-03-23 09:43:35 |
| R45.htm | 8153 | 2020-03-23 09:43:35 |
| R46.htm | 19928 | 2020-03-23 09:43:35 |
| R47.htm | 8203 | 2020-03-23 09:43:35 |
| R48.htm | 21971 | 2020-03-23 09:43:35 |
| R49.htm | 10484 | 2020-03-23 09:43:35 |
| R5.htm | 21282 | 2020-03-23 09:43:35 |
| R50.htm | 24440 | 2020-03-23 09:43:35 |
| R51.htm | 17604 | 2020-03-23 09:43:35 |
| R52.htm | 54123 | 2020-03-23 09:43:35 |
| R53.htm | 15897 | 2020-03-23 09:43:35 |
| R54.htm | 41946 | 2020-03-23 09:43:35 |
| R55.htm | 116014 | 2020-03-23 09:43:35 |
| R56.htm | 19024 | 2020-03-23 09:43:35 |
| R57.htm | 21192 | 2020-03-23 09:43:35 |
| R58.htm | 7835 | 2020-03-23 09:43:35 |
| R59.htm | 16800 | 2020-03-23 09:43:35 |
| R6.htm | 77125 | 2020-03-23 09:43:35 |
| R60.htm | 15131 | 2020-03-23 09:43:35 |
| R61.htm | 26183 | 2020-03-23 09:43:35 |
| R62.htm | 70477 | 2020-03-23 09:43:35 |
| R63.htm | 35249 | 2020-03-23 09:43:35 |
| R64.htm | 12660 | 2020-03-23 09:43:35 |
| R65.htm | 26503 | 2020-03-23 09:43:35 |
| R66.htm | 9856 | 2020-03-23 09:43:35 |
| R67.htm | 6639 | 2020-03-23 09:43:35 |
| R68.htm | 4128 | 2020-03-23 09:43:35 |
| R69.htm | 33919 | 2020-03-23 09:43:35 |
| R7.htm | 6751 | 2020-03-23 09:43:35 |
| R70.htm | 24589 | 2020-03-23 09:43:35 |
| R71.htm | 31831 | 2020-03-23 09:43:35 |
| R72.htm | 26946 | 2020-03-23 09:43:35 |
| R73.htm | 22135 | 2020-03-23 09:43:35 |
| R74.htm | 46568 | 2020-03-23 09:43:35 |
| R75.htm | 18950 | 2020-03-23 09:43:35 |
| R76.htm | 11965 | 2020-03-23 09:43:35 |
| R77.htm | 25269 | 2020-03-23 09:43:35 |
| R78.htm | 33342 | 2020-03-23 09:43:35 |
| R8.htm | 5723 | 2020-03-23 09:43:35 |
| R9.htm | 10195 | 2020-03-23 09:43:35 |
| report.css | 2767 | 2020-03-23 09:43:35 |
| Show.js | 1085 | 2020-03-23 09:43:35 |