Quarterly report pursuant to Section 13 or 15(d)

Long-term investment (Details Textual)

v3.7.0.1
Long-term investment (Details Textual)
¥ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 08, 2017
CNY (¥)
shares
May 05, 2017
USD ($)
shares
May 05, 2017
CNY (¥)
shares
Jul. 27, 2017
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
CNY (¥)
Income (Loss) from Equity Method Investments         $ (41,607) $ 0 $ 105,325 $ 0    
Sale of Stock, Consideration Received on Transaction | ¥     ¥ 71.0              
Investment Income, Interest         $ 491,325          
Yipeng Energy Technology Co. Ltd [Member]                    
Equity Method Investments                 $ 9,600,000 ¥ 65.0
Equity Method Investment, Ownership Percentage         28.32%   28.32%   35.40% 35.40%
Percentage of Subsidiary Equity Interest Sold   20.00% 20.00%              
Sale of Stock, Consideration Received on Transaction ¥ 60.0 $ 10,500,000 ¥ 60.0              
Sale of Stock, Percentage of Ownership before Transaction   35.40% 35.40%              
Sale of Stock, Percentage of Ownership after Transaction   4.654% 4.654% 4.654%            
Investment Income, Interest       $ 1,600,000            
Sale of Stock, Number of Shares Issued in Transaction | shares   25,145,834 25,145,834              
New Power [Member]                    
Sale of Stock, Number of Shares Issued in Transaction | shares 25,145,834