Note 6 - Income Taxes - Components of Losses Before Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Loss before income tax	$ 8,625	$ 8,769
Cayman Islands Tax Information Authority [Member]
Net loss before income taxes	2,129	3,613
Internal Revenue Service (IRS) [Member]
U.S.	3,023	2,023
State Administration of Taxation, China [Member]
Net loss before income taxes	596	975
British Virgin Islands Tax Authority [Member]
Net loss before income taxes	$ 2,877	$ 2,158