Note 11 - Financial Income, Net - Components of Financial Income, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Foreign exchange gains	$ 16	$ 156	$ 14
Interest income from marketable securities and deposits, net of amortization of premium on marketable securities	2,108	1,719	1,534
Other	2
Realized gains on marketable securities	26	7	16
Financial income	2,153	1,882	1,564
Realized losses on marketable securities	67	57	33
Foreign exchange losses	195	48	132
Interest expenses	15	14	16
Other	60	94	156
Financial expense	338	213	337
Financial income, net	$ 1,815	$ 1,669	$ 1,227