Note 4 - Summary of Significant Accounting Policies - Operating Lease Expenses and Supplemental Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Long-term operating lease contracts	$ 128	$ 103	$ 261	$ 193
Short-term operating lease contracts	8	14	14	29
Total	$ 136	$ 117	275	222
Operating cash flows used for operating leases (US$’000)			264	178
Right-of-use assets obtained in exchange for new lease liabilities (US$’000)			$ 0	$ 259
Weighted-average remaining lease term (Year)	5 years 6 months 3 days	6 years 21 days	5 years 6 months 3 days	6 years 21 days
Weighted-average discount rate	6.00%	6.00%	6.00%	6.00%