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Note 8 - Long-term Investments (Details Textual) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
May 31, 2021 | Jun. 30, 2021 | Jun. 30, 2021
Guangzhou Gong Xiang Technology Co. [Member] |  |  |
Equity Securities without Readily Determinable Fair Value, Percent |  | 15.00% | 15.00%
Xiao Peng Education [Member] |  |  |
Equity Securities without Readily Determinable Fair Value, Percent |  | 17.00% | 17.00%
Business Opportunity Chain [Member] |  |  |
Equity Securities without Readily Determinable Fair Value, Percent |  | 19.00% | 19.00%
Local Chain Xi’an [Member] |  |  |
Equity Securities without Readily Determinable Fair Value, Percent, Disposed Of | 4.90% |  |
Gain (Loss) on Investments, Total |  | $ (40) | $ 40

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