Note 8 - Long-term Investments (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Jun. 30, 2023
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount	$ (0)	$ (0)	$ (0)	$ 2
New Business Holdings Limited [Member]
Equity Securities Without Readily Determinable Fair Value, Percent	7.69%		7.69%
Guangdong Yong Fu Xiang Health Management Co., Ltd (Yong Fu Xiang) [Member]
Equity Securities Without Readily Determinable Fair Value, Percent	9.90%		9.90%
Wuhan Ju Liang [Member]
Equity Securities Without Readily Determinable Fair Value, Percent	9.90%		9.90%		9.90%