Note 7 - Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Computed income tax benefit at statutory rate	$ 789	$ 944
Permanent and other deductions, net	51	(55)
Goodwill impairment	(120)	(727)
Global intangible low-taxed income	(113)	(200)
Foreign income taxes	10
State income taxes, net of federal benefit	120	(9)
Deferred tax effects	(153)	(13)
Valuation allowance	(1,486)	(340)
Income tax expense	$ (902)	$ (400)
Effective tax rate	22.30%	9.10%