Note 4 - Summary of Significant Accounting Policies - Operating Lease Expenses and Supplemental Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Long-term operating lease contracts	$ 22	$ 326
Operating cash flows used for operating leases (US$’000)	25	498
Short-term operating lease contracts	34	31
Right-of-use assets obtained in exchange for new lease liabilities (US$’000)	0	0
Total	$ 56	$ 357
Weighted-average remaining lease term (years) (Year)		29 days
Weighted-average discount rate	6.00%	6.00%