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Note 7 - Property and equipment:
12 Months Ended
Dec. 31, 2011
Property, Plant and Equipment Disclosure [Text Block]
7.     Property and equipment

2011
Cost
 
Accumulated
amortization
 
Net book
value
 
             
Laboratory equipment
$ 3,645   $ 3,228   $ 417  
Computer equipment
  915     635     280  
Office equipment
  659     609     50  
Leasehold improvements
  3,185     1,965     1,220  
                   
  $ 8,404   $ 6,437   $ 1,967  
                   
                   
                   
2010
Cost
 
Accumulated
amortization
 
Net book
value
 
                   
Laboratory equipment
$ 3,480   $ 3,125   $ 355  
Computer equipment
  1,196     1,009     187  
Office equipment
  698     609     89  
Leasehold improvements
  3,135     1,697     1,438  
                   
  $ 8,509   $ 6,440   $ 2,069  
                   
Amortization expense for the year ended December 31, 2011 amounted to $760 (2010 - $838).