Note 4 - Income Taxes - Provision for Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Current:
Federal	$ (10)	$ 525
State	(25)	193
Total current	(35)	718
Deferred:
Federal
State
Total deferred
Income tax (benefit) expense	$ (35)	$ 718