Note 7 - Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Computed income tax benefit (expense) at statutory rate	$ 944	$ (228)
Permanent and other deductions, net	(782)	(34)
Global intangible low-taxed income	(200)	(149)
Foreign income taxes		55
State income taxes, net of federal benefit	(9)	26
Deferred tax effects	(13)	(3)
Valuation allowance – forfeiture of stock options	(340)
Income tax expense	$ (400)	$ (333)