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Note 8 - Long-term Investments (Details Textual)
$ in Thousands, ¥ in Millions
1 Months Ended 6 Months Ended
Aug. 19, 2018
USD ($)
Aug. 19, 2018
CNY (¥)
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2015
USD ($)
Equity Method Investments     $ 744 $ 753  
Shenzhen Mingshan [Member]          
Equity Method Investment, Ownership Percentage     23.18% 23.18%  
Zhao Shang Ke Hubei [Member]          
Equity Method Investment, Ownership Percentage     25.50% 25.50%  
Shenzhen Mingshan and Zhao Shang Ke Hubei [Member]          
Equity Method Investments         $ 0
ChinaNet Chuang Tou [Member]          
Cost Method Investment Ownership Percentage     19.00% 19.00%  
Cost-method Investments, Other than Temporary Impairment     $ 470    
ChinaNet Chuang Tou [Member] | Subsequent Event [Member]          
Cost Method Investments, Cash Returned $ 450 ¥ 3      
Chuangshi Meiwei [Member]          
Cost Method Investment Ownership Percentage     10.00% 10.00%  
ChinaNet Korea [Member]          
Cost Method Investment Ownership Percentage     15.00% 15.00%  
Guohua Shiji [Member]          
Cost Method Investment Ownership Percentage     19.00% 19.00%  
Beijing Saturday [Member]          
Cost Method Investment Ownership Percentage     10.00% 10.00%