Note 8 - Long-term Investments - Summary of Long-term Investments (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($)
Balance	$ 67
Exchange translation adjustment	(1)
Cash investment during the year	338
Balance	404
Guangzhou Gong Xiang Technology Co. [Member]
Balance
Exchange translation adjustment
Cash investment during the year	228
Balance	228
Xiao Peng Education [Member]
Balance
Exchange translation adjustment
Cash investment during the year	78
Balance	78
Business Opportunity Chain [Member]
Balance	29
Exchange translation adjustment
Cash investment during the year	32
Balance	61
Local Chain Xi’an [Member]
Balance	38
Exchange translation adjustment	(1)
Cash investment during the year
Balance	$ 37