Note 6 - Income Taxes - Reconciliation of Income Tax Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Loss before income tax	$ 8,625	$ 8,769
Loss before income tax	8,625	8,769
Expected income tax benefit	$ 1,811	$ 1,841
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	21.00%
Tax rate differential		$ (1,138)
Tax rate differential		13.10%
Non-deductible expenses		$ (20)
Non-deductible expenses		(0.20%)
Research tax credits	$ 86	$ (79)
Research tax credits		(0.90%)
Preferential rate		$ (166)
Preferential rate		(1.90%)
Current and deferred tax rate differences		$ (147)
Current and deferred tax rate differences		(1.70%)
Stock compensation expense-windfall		$ (44)
Change in valuation allowance		$ 577
Stock compensation expense-windfall		(0.50%)
Changes in valuation allowance		(6.60%)
Research and development super-deduction		$ 424
Others		$ 41
Research and development super-deduction		4.80%
Others		0.50%
UTP - interest expense		$ (525)
Stock Compensation Expense	$ (34)
UTP - interest expense		(6.00%)
Stock Compensation Expense	(0.40%)
Other	$ (9)
Other	0.10%
Changes in valuation allowance		$ (577)
Research and development tax credits	1.00%
Income tax expense	$ (90)	$ (96)
Change in unrecognized tax benefits	$ (2,318)
Income tax expense	(1.00%)	(1.10%)
Change in unrecognized tax benefits	(26.90%)
Less: valuation allowance	$ 1,551
Less: valuation allowance	18.00%
Cayman Islands Tax Information Authority [Member]
Tax rate differential	$ (447)
Tax rate differential	(5.20%)
British Virgin Islands Tax Authority [Member]
Tax rate differential	$ (604)
Tax rate differential	(7.00%)
State Administration of Taxation, China [Member]
Tax rate differential	$ 165
Tax rate differential	1.90%
Statutory GAAP prior year adjustment	$ 310
Statutory GAAP prior year adjustment	3.60%
Research and development	$ 442
Research and development	5.10%
Change in valuation allowance	$ (1,033)
Changes in valuation allowance	(12.00%)
Others	$ (9)
Others	(0.10%)
Changes in valuation allowance	$ 1,033