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