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16. Stock options (Details) (Stock Options, USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Stock Options
   
Number of options    
Outstanding, beginning of year 36,255 46,182
Granted 0 0
Cancelled/Expired (36,255) (9,927)
Exercised 0 0
Outstanding, end of year 0 36,255
Exercisable, end of year 0 36,255
Weighted average exercise price    
Options Outstanding, Beginning $ 3.36 $ 3.36
Options Granted $ 0 $ 0
Options cancelled/ expired $ (3.36) $ (3.47)
Options Exercised $ 0 $ 0
Options Outstanding, Ending $ 0 $ 3.36
Options Exercisable, Ending $ 0 $ 3.36