Note 15 - Taxation (Details Textual) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Operating Loss Carryforwards, Total	$ 22,800		$ 22,800		$ 20,300
Operating Loss Carryforwards, Taxable Income Deduction Limitations					80.00%
Deferred Tax Assets, Valuation Allowance, Total	10,223		10,223		$ 9,190
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	140	$ 30	900	$ 420
PRC Subsidiary And VIE's [Member]
Operating Loss Carryforwards, Total	$ 25,200		$ 25,200		$ 23,600