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Selected Statement of Operations Data (Details 7) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Earnings per ordinary share (''EPS''):      
Weighted average number of shares issued and outstanding - used in computation of basic EPS 19,234 19,183 18,949
Add - incremental shares from assumed exercise of options 73 100 83
Weighted average number of shares used in computation of diluted EPS 19,307 19,283 19,032