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Note 3 - Liquidity and Capital Resources (Details Textual)
$ in Thousands
1 Months Ended 3 Months Ended
Mar. 26, 2024
USD ($)
Mar. 31, 2024
CNY (¥)
Mar. 31, 2024
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
Operating Income (Loss)     $ (922) $ (1,312)  
Net Cash Provided by (Used in) Operating Activities     (353) $ (916)  
Cash and cash equivalents     467   $ 817
Working Capital     $ 3,430   $ 4,110
Beijing Yi En [Member]          
Business Acquisition, Percentage of Voting Interests Acquired     51.00%    
Business Combination, Consideration Transferred $ 0 ¥ 1