Note 12 - Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Expected federal income tax benefit	$ (5,662)	$ (4,327)
Disallowed R&D expenses	351	0
Non-taxable R&D rebate	(156)	0
Other permanent items	214	81
Return to provision	862	(100)
Stock-based compensation adjustment	213
Foreign rate differential	(270)	0
Other	27	0
Recognition of foreign net operating loss carryforwards	0	(557)
Effect of change in valuation allowance	4,421	4,903
Actual federal income tax benefit	$ 0	$ 0