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Note 12 - Selected Statements of Income Data - Financial Income, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Interest income	$ 4,499	$ 4,233	$ 3,300
Loss on available-for-sale marketable securities, net	(67)		(9)
Amortization of premium on available-for-sale marketable securities, net	(773)	(1,179)	(1,064)
Foreign exchange loss, net	(241)	(28)	(188)
Total	$ 3,418	$ 3,026	$ 2,039

X

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Amount of unrealized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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