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Shareholders' Equity (Details 1) - Stock Option [Member]
12 Months Ended
Dec. 31, 2017
$ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Options outstanding 314,125
Weighted average remaining contractual life (years) 2 years 7 months 24 days
Options exercisable 182,584
Weighted average Remaining Contractual life of options exercisable (years) 1 year 7 months 17 days
2.126 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price | $ / shares $ 2.126
Options outstanding 30,000
Weighted average remaining contractual life (years) 3 years 10 months 10 days
Options exercisable 10,002
Weighted average Remaining Contractual life of options exercisable (years) 3 years 10 months 10 days
2.131 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price | $ / shares $ 2.131
Options outstanding 75,000
Weighted average remaining contractual life (years) 4 years 11 months 4 days
Options exercisable
2.237 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price | $ / shares $ 2.237
Options outstanding 26,625
Weighted average remaining contractual life (years) 2 years 9 months 22 days
Options exercisable 17,749
2.96 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price | $ / shares $ 2.96
Options outstanding 73,000
Weighted average remaining contractual life (years) 2 years 4 months 17 days
Options exercisable 45,333
Weighted average Remaining Contractual life of options exercisable (years) 3 years 4 months 17 days
3.88 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price | $ / shares $ 3.88
Options outstanding 375
Weighted average remaining contractual life (years) 1 year 10 months 17 days
Options exercisable 375
Weighted average Remaining Contractual life of options exercisable (years) 1 year 10 months 17 days
3.88 One [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price | $ / shares $ 3.88
Options outstanding 90,000
Weighted average remaining contractual life (years) 10 months 6 days
Options exercisable 90,000
Weighted average Remaining Contractual life of options exercisable (years) 10 months 6 days
4.02 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price | $ / shares $ 4.02
Options outstanding 5,000
Weighted average remaining contractual life (years) 1 year 6 months 14 days
Options exercisable 5,000
Weighted average Remaining Contractual life of options exercisable (years) 1 year 6 months 14 days
6.67 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price | $ / shares $ 6.67
Options outstanding 10,000
Weighted average remaining contractual life (years) 1 year 3 months 11 days
Options exercisable 10,000
Weighted average Remaining Contractual life of options exercisable (years) 1 year 3 months 11 days
6.67 One [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price | $ / shares $ 6.67
Options outstanding 375
Weighted average remaining contractual life (years) 1 year 3 months 11 days
Options exercisable 375
Weighted average Remaining Contractual life of options exercisable (years) 1 year 3 months 11 days
33.60 [Member]  
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Exercise Price | $ / shares $ 33.60
Options outstanding 3,750
Weighted average remaining contractual life (years) 2 months 23 days
Options exercisable 3,750
Weighted average Remaining Contractual life of options exercisable (years) 2 months 23 days