Note 15 - Taxation (Details Textual) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Operating Loss Carryforwards, Total	$ 22,300		$ 20,300
Operating Loss Carryforwards, Taxable Income Deduction Limitations			80.00%
Deferred Tax Assets, Valuation Allowance, Total	9,666		$ 9,190
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount	550	$ 190
PRC Subsidiary And VIE's [Member]
Operating Loss Carryforwards, Total	$ 23,900		$ 23,600