Note 8 - Income Taxes - Summary of Components of Consolidated Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
U.S Federal income tax (expense) benefit
Current
Deferred	(104)	62
Total U.S. Federal income tax (expense) benefit	(104)	62
Current	(29)	(84)
Deferred
Total state and local income tax expense	(29)	(84)
Current	(30)	(31)
Total income tax expense	$ (163)	$ (53)