Note 6 - Income Taxes - Net Deferred Tax Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Unrealized loss on investments	$ 788	$ 896
IRC section 174 costs	822
Foreign Tax Credit	0	259
Fixed assets	(1,441)	(1,335)
Other	(124)	148
Total deferred tax asset	45
Total deferred tax (liability)		(32)
Less valuation allowance	(517)	(517)
Net deferred tax liability	$ (472)	$ (549)