Note 15 - Taxes on Income - Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current, Federal taxes	$ 2	$ 3	$ 2
Current, State taxes	1,272	943	368
Deferred	(2,834)	(2,814)	(462)
	(1,562)	(1,871)	(94)
	$ (1,560)	$ (1,868)	$ (92)