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Stock options (Details 2) (USD $)
12 Months Ended
Dec. 31, 2012
Number of Shares, Unvested at January 1, 2012 (in shares) 60,000
Number of Shares, Granted (in shares) 0
Number of Shares, Vested (in shares) (27,500)
Number of Shares, Forfeited/Expired (in shares) 0
Number of Shares, Unvested at December 31, 2012 (in shares) 32,500
Weighted-Average Grant Date Fair Value, Unvested at January 1, 2012 (in dollars per share) $ 3.49
Weighted-Average Grant Date Fair Value, Granted (in dollars per share) $ 0
Weighted-Average Grant Date Fair Value, Vested (in dollars per share) $ 3.90
Weighted-Average Grant Date Fair Value, Forfeited/Expired (in dollars per share) $ 0
Weighted-Average Grant Date Fair Value, Unvested at December 31, 2012 (in dollars per share) $ 3.14