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Stock-based compensation (Details 1) - Employee Stock Option [Member]
 12 Months Ended
Dec. 31, 2015
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Outstanding at the beginning of period -Options | shares 186,632
Granted - Options | shares 12,645
Exercised - Options | shares (48,885)
Forfeited/expired - Options | shares (55,914)
Outstanding at the ending of period -Options | shares 94,478
Exercisable-Options | shares 75,078
Outstanding-Weighted Average Exercise Price at the beginning of period - Options | $ / shares $ 10.18
Granted-Weighted Average Exercise Price | $ / shares 9.92
Exercised-Weighted Average Exercise Price | $ / shares 7.90
Forfeited/expired-Weighted Average Exercise Price | $ / shares 10.30
Outstanding-Weighted Average Exercise Price at the ending of period - Options | $ / shares 10.52
Exercisable-Weighted Average Exercise Price | $ / shares $ 10.46
Outstanding-Weighted Average Remaining Contractual Life (Years) 1 year 22 days
Exercisable-Weighted Average Remaining Contractual Life (Years) 10 months 10 days
Outstanding-Aggregate Intrinsic Value | $ $ 164,500 [1]
Exercisable-Aggregate Intrinsic Value | $ $ 133,764 [1]
[1] The intrinsic value of a stock option represents the amount by which the fair value of the underlying stock, measured by reference to the closing price of the common shares of $12.24 on the Nasdaq Global Select Market on December 31, 2015, exceeds the exercise price of the option.