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Consolidated Balance Sheets (Parenthetical) - ₪ / shares
Dec. 31, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Ordinary shares, par value ₪ 0.01 ₪ 0.01
Ordinary shares, shares authorized 88,000,000 88,000,000
Ordinary shares, shares issued 21,660,010 21,660,010
Ordinary shares, shares outstanding 19,307,418 19,261,418
Treasury shares 2,352,592 2,398,592