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Significant accounting policies: (Tables)
12 Months Ended
Dec. 31, 2012
Significant accounting policies:  
Schedule of property, plant and equipment

Assets

 

Basis

 

Rate

 

 

 

 

 

Buildings

 

Straight-line

 

10 years

Computer equipment and software

 

Straight-line

 

3 years

Furniture and fixtures

 

Straight-line

 

5 years

Machinery and equipment

 

Straight-line

 

8 – 10 years

Leasehold improvements

 

Straight-line

 

Lease term