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, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Long-term operating lease contracts	$ 136	$ 88	$ 329	$ 212
Short-term operating lease contracts	10	15	39	45
Total	$ 146	$ 103	368	$ 257
Operating cash flows used for operating leases (US$’000)			300
Right-of-use assets obtained in exchange for new lease liabilities (US$’000)			$ 266
Weighted-average remaining lease term (Year)	5 years 10 months 13 days		5 years 10 months 13 days
Weighted-average discount rate	6.00%		6.00%