Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000352825-26-000029-index-headers.html | 2026-05-04 16:02:38 | |
| 0000352825-26-000029-index.html | 2026-05-04 16:02:38 | |
| 0000352825-26-000029.txt | 2026-05-04 16:02:38 | |
 0000352825-26-000029-xbrl.zip | 225400 | 2026-05-04 16:02:38 |
| ex-101q12026.htm | 45793 | 2026-05-04 16:02:38 |
| ex-102q12026.htm | 74902 | 2026-05-04 16:02:38 |
| ex-311q12026.htm | 9835 | 2026-05-04 16:02:38 |
| ex-312q12026.htm | 10147 | 2026-05-04 16:02:38 |
| ex-320q12026.htm | 7322 | 2026-05-04 16:02:38 |
| FilingSummary.xml | 33239 | 2026-05-04 16:02:38 |
| fstr-20260331.htm | 918533 | 2026-05-04 16:02:38 |
| fstr-20260331.xsd | 38232 | 2026-05-04 16:02:38 |
| fstr-20260331_cal.xml | 68241 | 2026-05-04 16:02:38 |
| fstr-20260331_def.xml | 163484 | 2026-05-04 16:02:38 |
 fstr-20260331_g1.gif | 40353 | 2026-05-04 16:02:38 |
| fstr-20260331_htm.xml | 780774 | 2026-05-04 16:02:38 |
| fstr-20260331_lab.xml | 523860 | 2026-05-04 16:02:38 |
| fstr-20260331_pre.xml | 366337 | 2026-05-04 16:02:38 |
| MetaLinks.json | 815052 | 2026-05-04 16:02:38 |
| R1.htm | 53046 | 2026-05-04 16:02:38 |
| R10.htm | 10509 | 2026-05-04 16:02:38 |
| R11.htm | 94128 | 2026-05-04 16:02:38 |
| R12.htm | 66840 | 2026-05-04 16:02:38 |
| R13.htm | 47545 | 2026-05-04 16:02:38 |
| R14.htm | 11683 | 2026-05-04 16:02:38 |
| R15.htm | 11427 | 2026-05-04 16:02:38 |
| R16.htm | 23150 | 2026-05-04 16:02:38 |
| R17.htm | 25204 | 2026-05-04 16:02:38 |
| R18.htm | 9232 | 2026-05-04 16:02:38 |
| R19.htm | 25193 | 2026-05-04 16:02:38 |
| R2.htm | 132732 | 2026-05-04 16:02:38 |
| R20.htm | 18504 | 2026-05-04 16:02:38 |
| R21.htm | 12713 | 2026-05-04 16:02:38 |
| R22.htm | 8465 | 2026-05-04 16:02:38 |
| R23.htm | 10892 | 2026-05-04 16:02:38 |
| R24.htm | 84685 | 2026-05-04 16:02:38 |
| R25.htm | 61649 | 2026-05-04 16:02:38 |
| R26.htm | 51245 | 2026-05-04 16:02:38 |
| R27.htm | 9807 | 2026-05-04 16:02:38 |
| R28.htm | 12097 | 2026-05-04 16:02:38 |
| R29.htm | 15874 | 2026-05-04 16:02:38 |
| R3.htm | 13954 | 2026-05-04 16:02:38 |
| R30.htm | 24242 | 2026-05-04 16:02:38 |
| R31.htm | 19224 | 2026-05-04 16:02:38 |
| R32.htm | 12648 | 2026-05-04 16:02:38 |
| R33.htm | 16907 | 2026-05-04 16:02:38 |
| R34.htm | 60803 | 2026-05-04 16:02:38 |
| R35.htm | 33619 | 2026-05-04 16:02:38 |
| R36.htm | 7370 | 2026-05-04 16:02:38 |
| R37.htm | 25094 | 2026-05-04 16:02:38 |
| R38.htm | 23388 | 2026-05-04 16:02:38 |
| R39.htm | 12742 | 2026-05-04 16:02:38 |
| R4.htm | 100529 | 2026-05-04 16:02:38 |
| R40.htm | 12894 | 2026-05-04 16:02:38 |
| R41.htm | 17566 | 2026-05-04 16:02:38 |
| R42.htm | 15435 | 2026-05-04 16:02:38 |
| R43.htm | 41062 | 2026-05-04 16:02:38 |
| R44.htm | 11149 | 2026-05-04 16:02:38 |
| R45.htm | 12685 | 2026-05-04 16:02:38 |
| R46.htm | 11814 | 2026-05-04 16:02:38 |
| R47.htm | 14425 | 2026-05-04 16:02:38 |
| R48.htm | 49811 | 2026-05-04 16:02:38 |
| R49.htm | 50393 | 2026-05-04 16:02:38 |
| R5.htm | 43666 | 2026-05-04 16:02:38 |
| R50.htm | 4599 | 2026-05-04 16:02:38 |
| R51.htm | 16818 | 2026-05-04 16:02:38 |
| R52.htm | 33860 | 2026-05-04 16:02:38 |
| R53.htm | 32113 | 2026-05-04 16:02:38 |
| R54.htm | 15187 | 2026-05-04 16:02:38 |
| R55.htm | 10830 | 2026-05-04 16:02:38 |
| R56.htm | 16562 | 2026-05-04 16:02:38 |
| R6.htm | 4660 | 2026-05-04 16:02:38 |
| R7.htm | 84177 | 2026-05-04 16:02:38 |
| R8.htm | 59222 | 2026-05-04 16:02:38 |
| R9.htm | 9981 | 2026-05-04 16:02:38 |
| report.css | 2767 | 2026-05-04 16:02:38 |
| Show.js | 1085 | 2026-05-04 16:02:38 |