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Shareholders' Equity (Details 1) - Stock Option [Member] - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Number of options      
Outstanding - beginning of year 320,875 314,125 252,670
Changes during the year:      
Granted 95,000 108,000 75,000
Exercised (125,195)
Forfeited (43,806) (101,250) (13,545)
Outstanding - year end 246,874 320,875 314,125
Vested and expected to vest 148,498 167,874 192,584
Exercisable at year end 79,372 157,874 182,584
Weighted-average exercise price      
Outstanding - beginning of year $ 2.59 $ 3.39 $ 6.21
Changes during the year:      
Granted 2.13 2.39 2.13
Exercised 2.52
Forfeited 3.65 4.85 49.09
Outstanding - year end 2.26 2.59 3.39
Vested and expected to vest 2.41 2.9 4.1
Exercisable at year end $ 2.38 $ 2.89 $ 4.17