Note 14 - Taxes on Income - Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income (loss) before income tax benefit (expense)	$ (3,825)	$ (3,095)	$ 5,407
Theoretical tax expenses (tax benefit) at U.S. statutory tax rate (21% for 2018 and 35% for 2017 and 2016)	(803)	(1,083)	1,892
State taxes, net of federal benefit	3	2	3
Foreign income taxed at rates other than the U.S. rate (including deferred taxes that were not provided, valuation allowance and current adjustment and interest on uncertain tax position liability)	(1,767)	(808)	(2,580)
Nondeductible equity-based compensation expenses	542	816	695
Valuation allowance in U.S.	157	984	583
Other		(2)	1
	$ (1,868)	$ (92)	$ 594