Note 10 - Income Taxes - Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Federal	$ 394		$ 2,137
State		51
Federal	(1,524)	2,006	(5,056)
State	(220)	(479)
Total provision (benefit) for income taxes	$ (1,350)	$ 1,578	$ (2,919)