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Note 8 - Long-term Investments (Details Textual) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
May 27, 2024
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Jun. 30, 2023
Equity Securities without Readily Determinable Fair Value, Impairment Loss, Annual Amount   $ (0) $ (2) $ 2 $ 207  
New Business Holdings Limited [Member]            
Equity Method Investment, Percentage Sold 7.69%          
Proceeds from Sale of Equity Method Investments $ 400          
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%