Note 8 - Income Taxes -Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Carrying values of ownership interests and other holdings	$ 33,222	$ 31,985
Tax loss and credit carryforwards	68,492	77,045
Disallowed interest carryforwards	6,891	7,120
Accrued expenses	47	24
Stock-based compensation	180	268
Other	(106)	136
Deferred Tax Assets, Gross, Total	108,726	116,578
Valuation allowance	(108,726)	(116,578)
Net deferred tax asset	$ 0	$ 0