Note 14 - Taxation (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Operating Loss Carryforwards, Total	$ 30,400		$ 30,400		$ 23,300
Operating Loss Carryforwards, Taxable Income Deduction Limitations	80.00%		80.00%
Deferred Tax Assets, Valuation Allowance, Total	$ 11,855		$ 11,855		10,245
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	1,650	$ 210	1,960	$ 760
PRC Subsidiary And VIE's [Member]
Operating Loss Carryforwards, Total	$ 24,300		$ 24,300		$ 22,500