Note 8 - Long-term Investments - Summary of Long-term Investments (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2021 USD ($)
Balance	$ 67
Cash investment during the year	421
Disposed during the year	(38)
Balance	450
Guangzhou Gong Xiang Technology Co. [Member]
Balance	0
Cash investment during the year	232
Disposed during the year	0
Balance	232
Xiao Peng Education [Member]
Balance	0
Cash investment during the year	79
Disposed during the year	0
Balance	79
Business Opportunity Chain [Member]
Balance	29
Cash investment during the year	110
Disposed during the year	0
Balance	139
Local Chain Xi’an [Member]
Balance	38
Cash investment during the year	0
Disposed during the year	(38)
Balance	$ 0