Note 4 - Summary of Significant Accounting Policies - Operating Lease Expenses and Supplemental Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Long-term operating lease contracts	$ 125	$ 136	$ 386	$ 329
Short-term operating lease contracts	9	10	23	39
Total	$ 134	$ 146	409	$ 368
Operating cash flows used for operating leases (US$’000)			409
Right-of-use assets obtained in exchange for new lease liabilities (US$’000)			$ 0
Weighted-average remaining lease term (Year)	5 years 5 months 1 day		5 years 5 months 1 day
Weighted-average discount rate	6.00%		6.00%