Note 15 - Taxation (Details Textual) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Operating Loss Carryforwards, Total	$ 22,600		$ 22,600		$ 20,300
Operating Loss Carryforwards, Taxable Income Deduction Limitations					80.00%
Deferred Tax Assets, Valuation Allowance, Total	9,880		9,880		$ 9,190
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	210	$ 260	760	$ 450
PRC Subsidiary And VIE's [Member]
Operating Loss Carryforwards, Total	$ 24,200		$ 24,200		$ 23,600