Parent Directory| Name | Size | Last Modified |
|---|---|---|
 0000352825-23-000095-index-headers.html | 2023-08-08 13:54:10 | |
| 0000352825-23-000095-index.html | 2023-08-08 13:54:10 | |
| 0000352825-23-000095.txt | 2023-08-08 13:54:10 | |
 0000352825-23-000095-xbrl.zip | 250806 | 2023-08-08 13:54:10 |
| ex-311q22023.htm | 9715 | 2023-08-08 13:54:10 |
| ex-312q22023.htm | 10095 | 2023-08-08 13:54:10 |
| ex-31q22023.htm | 162850 | 2023-08-08 13:54:10 |
| ex-320q22023.htm | 7422 | 2023-08-08 13:54:10 |
| FilingSummary.xml | 38268 | 2023-08-08 13:54:10 |
| Financial_Report.xlsx | 90749 | 2023-08-08 13:54:10 |
| fstr-20230630.htm | 1410267 | 2023-08-08 13:54:10 |
| fstr-20230630.xsd | 46501 | 2023-08-08 13:54:10 |
| fstr-20230630_cal.xml | 76481 | 2023-08-08 13:54:10 |
| fstr-20230630_def.xml | 213527 | 2023-08-08 13:54:10 |
 fstr-20230630_g1.gif | 11441 | 2023-08-08 13:54:10 |
| fstr-20230630_htm.xml | 1127140 | 2023-08-08 13:54:10 |
| fstr-20230630_lab.xml | 627901 | 2023-08-08 13:54:10 |
| fstr-20230630_pre.xml | 415896 | 2023-08-08 13:54:10 |
| MetaLinks.json | 788803 | 2023-08-08 13:54:10 |
| R1.htm | 53063 | 2023-08-08 13:54:10 |
| R10.htm | 6367 | 2023-08-08 13:54:10 |
| R11.htm | 68968 | 2023-08-08 13:54:10 |
| R12.htm | 113300 | 2023-08-08 13:54:10 |
| R13.htm | 54198 | 2023-08-08 13:54:10 |
| R14.htm | 10514 | 2023-08-08 13:54:10 |
| R15.htm | 11507 | 2023-08-08 13:54:10 |
| R16.htm | 20181 | 2023-08-08 13:54:10 |
| R17.htm | 33436 | 2023-08-08 13:54:10 |
| R18.htm | 8007 | 2023-08-08 13:54:10 |
| R19.htm | 23687 | 2023-08-08 13:54:10 |
| R2.htm | 123797 | 2023-08-08 13:54:10 |
| R20.htm | 34229 | 2023-08-08 13:54:10 |
| R21.htm | 54145 | 2023-08-08 13:54:10 |
| R22.htm | 18383 | 2023-08-08 13:54:10 |
| R23.htm | 15386 | 2023-08-08 13:54:10 |
| R24.htm | 8480 | 2023-08-08 13:54:10 |
| R25.htm | 5482 | 2023-08-08 13:54:10 |
| R26.htm | 66484 | 2023-08-08 13:54:10 |
| R27.htm | 110420 | 2023-08-08 13:54:10 |
| R28.htm | 57754 | 2023-08-08 13:54:10 |
| R29.htm | 9146 | 2023-08-08 13:54:10 |
| R3.htm | 13977 | 2023-08-08 13:54:10 |
| R30.htm | 12193 | 2023-08-08 13:54:10 |
| R31.htm | 15934 | 2023-08-08 13:54:10 |
| R32.htm | 32773 | 2023-08-08 13:54:10 |
| R33.htm | 18141 | 2023-08-08 13:54:10 |
| R34.htm | 28221 | 2023-08-08 13:54:10 |
| R35.htm | 52832 | 2023-08-08 13:54:10 |
| R36.htm | 8280 | 2023-08-08 13:54:10 |
| R37.htm | 25822 | 2023-08-08 13:54:10 |
| R38.htm | 19971 | 2023-08-08 13:54:10 |
| R39.htm | 20830 | 2023-08-08 13:54:10 |
| R4.htm | 82115 | 2023-08-08 13:54:10 |
| R40.htm | 12448 | 2023-08-08 13:54:10 |
| R41.htm | 30783 | 2023-08-08 13:54:10 |
| R42.htm | 29625 | 2023-08-08 13:54:10 |
| R43.htm | 13751 | 2023-08-08 13:54:10 |
| R44.htm | 18632 | 2023-08-08 13:54:10 |
| R45.htm | 11696 | 2023-08-08 13:54:10 |
| R46.htm | 22087 | 2023-08-08 13:54:10 |
| R47.htm | 34444 | 2023-08-08 13:54:10 |
| R48.htm | 9831 | 2023-08-08 13:54:10 |
| R49.htm | 8175 | 2023-08-08 13:54:10 |
| R5.htm | 44841 | 2023-08-08 13:54:10 |
| R50.htm | 10249 | 2023-08-08 13:54:10 |
| R51.htm | 11838 | 2023-08-08 13:54:10 |
| R52.htm | 14157 | 2023-08-08 13:54:10 |
| R53.htm | 31598 | 2023-08-08 13:54:10 |
| R54.htm | 39990 | 2023-08-08 13:54:10 |
| R55.htm | 13385 | 2023-08-08 13:54:10 |
| R56.htm | 33743 | 2023-08-08 13:54:10 |
| R57.htm | 31843 | 2023-08-08 13:54:10 |
| R58.htm | 20297 | 2023-08-08 13:54:10 |
| R59.htm | 25489 | 2023-08-08 13:54:10 |
| R6.htm | 9701 | 2023-08-08 13:54:10 |
| R60.htm | 20230 | 2023-08-08 13:54:10 |
| R61.htm | 23255 | 2023-08-08 13:54:10 |
| R62.htm | 11917 | 2023-08-08 13:54:10 |
| R63.htm | 36210 | 2023-08-08 13:54:10 |
| R64.htm | 7460 | 2023-08-08 13:54:10 |
| R7.htm | 91257 | 2023-08-08 13:54:10 |
| R8.htm | 75004 | 2023-08-08 13:54:10 |
| R9.htm | 10397 | 2023-08-08 13:54:10 |
| report.css | 2767 | 2023-08-08 13:54:10 |
| Show.js | 1085 | 2023-08-08 13:54:10 |