Note 12 - Financial Income, Net - Components of Financial Income, Net (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Foreign exchange gains		$ 121	$ 16	$ 156
Interest income from marketable securities and deposits, net of amortization of premium on marketable securities		2,506	2,108	1,719
Other			2
Realized gains on marketable securities		4	27	7
Financial income		2,631	2,153	1,882
Realized losses on marketable securities		77	68	57
Foreign exchange losses (*)	[1]	825	195	48
Interest expenses		15	15	14
Other		60	60	94
Financial expense		977	338	213
Financial income, net		$ 1,654	$ 1,815	$ 1,669

[1] Includes $785 of exchange rate differences resulting from the new lease accounting standard (ASC 842) for the year ended December 31, 2019.