Note 11 - Supplemental Balance Sheet Information - Other Noncurrent Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Deductible input value-added tax	$ 119	$ 113
Others	97	100
Total	$ 216	$ 213

Amount of noncurrent assets classified as other.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(17))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Name:	us-gaap_OtherAssetsNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant