JOINT FILING AGREEMENT


EXHIBIT 1

 
The undersigned hereby agree to the joint filing of the Schedule 13G to which this Agreement is attached.
 
 
Dated:  February 14, 2011
 
 
 
OBERWEIS ASSET MANAGEMENT, INC.
 
By:      /s/ Xxxxxxx X. Xxxxx                                                                    
     Xxxxxxx X. Xxxxx
     Executive Vice President


XXXXX X. XXXXXXXX

 
/s/ Xxxxx X. Xxxxxxxx                                                              

 

 
XXXXX X. XXXXXXXX

/s/ Xxxxx X. Xxxxxxxx                                                              



 
 
 

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Filed: February 14th, 2011
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