<DOCUMENT>
<TYPE>EX-99.1
<SEQUENCE>3
<FILENAME>dex991.txt
<DESCRIPTION>JOINT FILING AGREEMENT
<TEXT>
<PAGE>

                                                                       EXHIBIT 1

                             JOINT FILING AGREEMENT

         The undersigned hereby agree to the joint filing of the Schedule 13G to
which this Agreement is attached.

    Dated:  February 26, 2004

                                              OBERWEIS ASSET MANAGEMENT, INC.


                                              By:  /s/ Patrick B. Joyce
                                                   -----------------------------
                                                       Patrick B. Joyce
                                                       Executive Vice President

                                                   JAMES D. OBERWEIS

                                                   /s/ James D. Oberweis
                                                   -----------------------------

                                                   JAMES W. OBERWEIS

                                                   /s/ James W. Oberweis
                                                   -----------------------------

</TEXT>
</DOCUMENT>