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Share-Based Payments (Details 1)
 6 Months Ended
Jun. 30, 2016
$ / shares
shares
Shares  
Outstanding, beginning balance 709,300
Options granted 5,000
Options cancelled (15,020)
Options exercised (21,050)
Outstanding, ending balance 678,230
Options exercisable 278,730
Options available for future grants 188,065
Weighted Average Exercise Price  
Outstanding, beginning balance | $ / shares $ 24.34
Options granted | $ / shares 26.4
Options cancelled | $ / shares 27.3
Options exercised | $ / shares 19.08
Outstanding, ending balance | $ / shares 24.45
Options exercisable | $ / shares $ 22.13