Type | Filed | Filer | Subject | Shares Owned | Percent Owned | |
---|---|---|---|---|---|---|
SC 13G | 2000-02-03 | DIMENSIONAL FUND ADVISORS INC | MFRI INC | 247,200 | 5.0% | EDGAR |
SC 13G/A | 2000-01-26 | HEARTLAND ADVISORS INC | MFRI INC | 9 | 11.0% | EDGAR |
SC 13G/A | 2000-01-26 | HEARTLAND ADVISORS INC | MFRI INC | 9 | 11.0% | EDGAR |
SC 13G/A | 2000-01-26 | HEARTLAND ADVISORS INC | MFRI INC | 9 | 11.0% | EDGAR |