Note 8 - Long-term Investments (Details Textual) - USD ($) $ in Thousands	1 Months Ended	9 Months Ended
	May 31, 2021	Sep. 30, 2021	Dec. 31, 2020
Equity Securities without Readily Determinable Fair Value, Amount		$ 1,911	$ 67
New Business Holdings Limited [Member]
Equity Securities without Readily Determinable Fair Value, Percent		15.38%
Equity Securities without Readily Determinable Fair Value, Amount		$ 1,000
Guang Dong WeFriend Co., Ltd [Member]
Equity Securities without Readily Determinable Fair Value, Percent		10.00%
Equity Securities without Readily Determinable Fair Value, Amount		$ 460
Guangzhou Gong Xiang Technology Co. [Member]
Equity Securities without Readily Determinable Fair Value, Percent		15.00%
Equity Securities without Readily Determinable Fair Value, Amount		$ 230
Xiao Peng Education [Member]
Equity Securities without Readily Determinable Fair Value, Percent		17.00%
Equity Securities without Readily Determinable Fair Value, Amount		$ 80
Business Opportunity Chain [Member]
Equity Securities without Readily Determinable Fair Value, Percent		19.00%
Equity Securities without Readily Determinable Fair Value, Amount		$ 110
Local Chain Xi’an [Member]
Equity Securities without Readily Determinable Fair Value, Percent, Disposed Of	4.90%
Gain (Loss) on Investments, Total		$ (40)