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Shareholders' Equity (Details) - Stock Option [Member] - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Number of options      
Outstanding - beginning of year 314,125 252,670 238,894
Changes during the year:      
Granted 108,000 75,000 30,000
Exercised (10,000)
Forfeited (101,250) (13,545) (6,224)
Outstanding - year end 320,875 314,125 252,670
Vested and expected to vest 167,874 192,584 154,333
Exercisable at year end 157,874 182,584 144,333
Weighted-average exercise price      
Outstanding - beginning of year $ 3.39 $ 6.21 $ 6.65
Changes during the year:      
Granted 2.39 2.13 2.13
Exercised 2.96
Forfeited 4.85 49.09 8.56
Outstanding - year end 2.59 3.39 6.21
Vested and expected to vest 2.90 4.10 8.44
Exercisable at year end $ 2.89 $ 4.17 $ 8.82