Note 7 - Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Start-up costs	$ 5,618	$ 4,158
Federal net operating loss carryforwards	10,866	7,982
State tax loss carryforwards	64	48
Foreign net operating loss carryforwards	122	126
Tax credit carryforward	991	670
ROU Liability	34	58
Deferred compensation	1,157	880
Total deferred tax assets	18,852	13,922
Less valuation allowance	(18,823)	(13,867)	$ (9,418)
Net deferred tax assets	29	55
Fixed assets	(6)	(12)
ROU Asset	(23)	(43)
Total deferred tax liabilities	(29)	(55)
Net deferred taxes	$ 0	$ 0