EX-99.1 3 dex991.txt JOINT FILING AGREEMENT 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 ---------------------------------- Page 10 of 10 pages