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Selected Statement of Operations Data (Details 3) - shares
shares in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Earnings per ordinary share (''EPS''):      
Weighted average number of shares issued and outstanding - used in computation of basic EPS 19,746 19,344 19,292
Add - incremental shares from assumed exercise of options 216 217 267
Weighted average number of shares used in computation of diluted EPS 19,962 19,561 19,559