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.



                                                                       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.


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                                                       ▇▇▇▇▇▇▇ ▇. ▇▇▇▇▇
                                                       Executive Vice President

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                                                   /s/ ▇▇▇▇▇ ▇. ▇▇▇▇▇▇▇▇
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Filed: February 26th, 2004