Note 8 - Long-term Investments - Movement in Cost Method Investments (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($)
Cost method investments, balance	$ 918
Cost method investments, balance	453
ChinaNet Korea [Member]
Cost method investments, balance	918
Impairment on cost method investments	(453)
Exchange translation adjustment	(12)
Cost method investments, balance	$ 453