Note 4 - Income Taxes - Components of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Current:
Federal
State	(7)	(14)
Foreign	(88)
Total current	(95)	(14)
Deferred:
Federal	22
State	16
Total deferred	38
Income tax expense	$ (57)	$ (14)