Note 4 - Summary of Significant Accounting Policies - Operating Lease Expenses and Supplemental Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Long-term operating lease contracts	$ 326	$ 459
Operating cash flows used for operating leases (US$’000)	498	361
Short-term operating lease contracts	31	48
Right-of-use assets obtained in exchange for new lease liabilities (US$’000)	0	252
Total	$ 357	$ 507
Weighted-average remaining lease term (years) (Year)	29 days	5 years 9 months
Weighted-average discount rate	6.00%	6.00%