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Selected Statements of Operations Data (Details 3) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Numerator:      
Numerator for basic net income (loss) per Ordinary Share $ 2,901 $ 1,915 $ (923)
Effect of dilutive securities:      
Options and warrants issued to grantees and investors, respectively
Numerator for dilutive net income (loss) per Ordinary Share $ 2,901 $ 1,915 $ (923)
Denominator:      
Denominator for dilutive net income (loss) per Ordinary Share - weighted average number of Ordinary Shares 12,039,176 10,406,897 8,572,681
Effect of dilutive securities:      
Options and warrants issued to grantees and investors, respectively 312,390 372,650
Denominator for diluted net income (loss) per Ordinary Share - adjusted weighted average number of Ordinary Shares 12,351,566 10,779,547 8,572,681