Note 3 - Income Taxes - Provision for (Benefit from) Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Current:
Federal (Net of a 2018 net operating loss benefit of $288)
State (Net of a 2018 and 2019 net operating loss benefit of $35 and $97, respectively)	7	3
Foreign	5	1
Provision for income taxes	12	4
Deferred:
Federal
State	30
Deferred income tax	(30)
Net income tax expense	$ (18)	$ 4