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7. Fixed assets (Tables)
3 Months Ended
Mar. 31, 2013
Property, Plant and Equipment [Abstract]  
Property Plant and Equipment
         Net Book Value
   Cost  Accumulated Amortization  March 31, 2013  March 31, 2012  December 31, 2012
Computer equipment  $22,183   $5,935   $16,248   $11,232   $16,602 
Computer software   27,108    24,102    3,006    19,116    4,096 
Furniture and equipment   409,776    168,016    241,760    313,129    264,476 
Medical equipment   360,913    172,197    188,716    252,279    205,697 
Vehicles   50,865    11,744    39,121    —      42,472 
Leasehold improvements   142,943    62,915    80,028    67,026    84,224 
   $1,001,378   $432,499   $568,879   $662,782   $617,567