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Selected Statements of Income Data (Details 1) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Selected Statements of Income Data [Abstract]      
Bank charges and interest from loans offset by interest from short term deposits $ (986) $ (1,124) $ (199)
Interest expenses related to liabilities in connection with acquisitions (4) (62) (257)
Interest income from marketable securities, net of amortization of premium on marketable securities 284 284 240
Gain (loss) arising from foreign currency translation and other 855 (809) (214)
Financial income (expenses), net $ (149) $ 1,711 $ 430