| 10-K405 | - | 1997-03-31 | 1996-12-31 |
| Major company event | 8-K | 1997-03-28 | 1997-03-26 |
| Passive ownership stake (update) | SC 13G/A | 1997-02-13 | - |
| Activist ownership stake (update) | SC 13D/A | 1997-01-02 | - |
| Activist ownership stake (update) | SC 13D/A | 1996-11-15 | - |
| Quarterly report | 10-Q | 1996-11-14 | 1996-09-30 |
| Activist ownership stake (update) | SC 13D/A | 1996-09-18 | - |
| Major company event | 8-K | 1996-08-16 | 1996-08-16 |
| Quarterly report | 10-Q | 1996-08-14 | 1996-06-30 |
| DEF 14C | - | 1996-07-26 | 1996-07-23 |
| PRER14C | - | 1996-07-08 | - |
| Major company event | 8-K | 1996-06-21 | 1996-06-21 |
| PRE 14C | - | 1996-06-21 | 1996-07-23 |
| Activist ownership stake (update) | SC 13D/A | 1996-06-21 | - |
| Quarterly report | 10-Q | 1996-05-15 | 1996-03-31 |
| 10-K405 | - | 1996-04-01 | 1995-12-31 |
| Activist ownership stake (update) | SC 13D/A | 1996-03-08 | - |
| Passive ownership stake | SC 13G | 1996-02-09 | - |
| Activist ownership stake (update) | SC 13D/A | 1996-01-23 | - |
| Activist ownership stake (update) | SC 13D/A | 1996-01-19 | - |
| Activist ownership stake (update) | SC 13D/A | 1995-12-29 | - |
| Major company event | 8-K | 1995-12-05 | 1995-12-04 |
| Quarterly report | 10-Q | 1995-11-14 | 1995-09-30 |
| Activist ownership stake | SC 13D | 1995-09-18 | - |
| Activist ownership stake | SC 13D | 1995-08-30 | - |
| Quarterly report | 10-Q | 1995-08-11 | 1995-06-30 |
| Quarterly report | 10-Q | 1995-05-15 | 1995-03-31 |
| Activist ownership stake (update) | SC 13D/A | 1995-04-13 | - |
| Annual report | 10-K | 1995-03-31 | 1994-12-31 |
| Major company event | 8-K | 1995-03-17 | 1995-03-16 |
| 424B3 | - | 1995-02-24 | - |
| S-3/A | - | 1995-02-22 | - |
| 8-A12B | - | 1995-02-10 | - |
| S-3/A | - | 1995-02-03 | - |
| S-3/A | - | 1995-01-20 | - |
| Activist ownership stake (update) | SC 13D/A | 1994-07-29 | - |
| Activist ownership stake (update) | SC 13D/A | 1994-07-28 | - |
| Activist ownership stake (update) | SC 13D/A | 1994-04-14 | - |
