Note 6 - Income Taxes - Net Deferred Tax Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Unrealized loss on investments	$ 896	$ 788
Foreign Tax Credit	259	124
Fixed assets	(1,335)	(1,347)
Other	148	134
Total deferred tax liability	(32)	(301)
Less valuation allowance	(517)	(517)
Net deferred tax liability	$ (549)	$ (818)